Cisco can ping ipv4 but not ipv6 But at first glance I did not see here the multicast map command on spokes. You do not need to enter any special commands to do so; simply enter the IPv4 configuration commands and IPv6 configuration commands as you normally would. What is failing is the equivalent of ARP (see above). I am not able to add the eui-64 prefix to my VLAN. The only difference here is indeed the IP address in the next hop attribute: for IPv6 address, Null0 adjacency is inserted into Sep 11, 2023 · Book Title. 09. I can ping the wireless controller user-VLAN interface from client machine, I can ping controller virtual interface from client machine, I can ping from controller to client machine. 2) if there is a release from BNG, the session renew with same ipv4 address but NOT ipv6 address (ie. Strangely enough, i can ping 2001::1 (R1) from R2 (2004::1): See full list on theitbros. I have an SVI for vlan 192. All the IPv6 addresses will be mapped to single IPv4. I have configured the router with both IPv4 and IPv6 addresses on the G0/0 interface, and have also configured SSH version 2 on the router. Apr 6, 2012 · Hi everybody, I'm running a lab with GNS3 which is composed of 2 ASA's (8. When Cisco IOS XR software is configured with both an IPv4 and an IPv6 address, the interface can send and receive data on both IPv4 and IPv6 networks. I can easily do it on Juniper side but wasn’t able to do it on the 3750. Combining the IPv6 network to the IPv4 network, I have a switch. My switch can ping my router, but my router can't ping the switch or even its own vlan 1 interface so I don't know what monster I have created. The Sep 16, 2020 · I'm not running ipv6 anywhere on this router: If I ping tools. Apr 18, 2015 · down votefavorite PCs are connected to Cisco switch and up link goes to Cisco 1841 router on router LAN side interface f0/0 ip add: 2001:xx:xx:xx:1000::64/120. At this point, I can not say whether the the problem is on host side or on router side, did anybody have the same problem while deploying IPv6? Thanks, Jian Jul 26, 2011 · Then Ipv6 nat on the interfaces and I can ping from the remote v6 network to the server IP however can not ping from IPv4 to IPv6 back, this is where I need to work on, if any one know the answer please reply I may be missing something. I think it may have something to do with the ACL but I haven't gotten there yet so I'm not sure how deny tcp any any eq 22 followed by permit tcp any any eq 22 really works. IPv6 MTU Path Discovery; ICMP for IPv6; IPv6 MTU Path Discovery. You would need to give both of the PCs IPv4 and IPv6 addresses to communicate. 0, and no ipv6 commands can be configured on 2960. is there any solution for this. - you have enough access to ping. Second, what another user answered earlier you have to tell the call-home to do the same using the "http resolve-hostname ipv4-first" in the call-home config. Stay Connected Member Directory. Jul 24, 2014 · IPv4-compatible IPv6 addresses are assigned to nodes that support both the IPv4 and IPv6 protocol stacks and are used in automatic tunnels. co. February 11, 2016. I can ping each device from the 9200 and can ping from device to device over ipv6. 122. PC-A can ping the switch without a problem. In this case, the first packet would be too big based on the underlying layer 2 protocol (or an imposed layer 3 mtu). com Type escape sequence to abort May 13, 2025 · Another question for the Pros for Lab IPv6 Routing in Chapter 24 (1/e) I have completed the entire Lab got 100% all pings working Except for PC4 pinging PC1 R4 can Ping PC1 but the tracert just stops dead at R4's Gi0/0 interface. Switch#configure terminal. 114, timeout is 2 seconds: No route to host 172. With IPv6 we can't fragment in path and must depend on pmtu discovery. Altough in both the Core Switch (an old 4500) and the access switch I'm trying to register (9200) I have configured the same name servers, on the 9200 it's resolving the IPv6 address f Dec 1, 2021 · it's an old L2 switch (WS-C2960G-24TC-L 12. For this purpose we have assigned a loopback 1 with an ipv6 address of 2004:db8::1/128. com fine). ipv6 icmp permit any neighbor-solicitation INET-IPV6 . 2nd question at step-2 . but vios running with another emulator(E Mar 2, 2016 · I'm new to cisco command language, so please be gentle. 2(55)SE12 C2960-LANBASEK9-M). IPv6 packets are not supported. It will work because the switch . With PPPoE I have both IPv4 and IPv6 Framed and delegated prefix. Any Jul 14, 2021 · The entire 128-bit IPv4-compatible IPv6 address is used as the IPv6 address of a node and the IPv4 address embedded in the low-order 32 bits is used as the IPv4 address of the node. Cisco Nexus 9000 Series NX-OS Unicast Routing Configuration Guide, Release 9. I configured the DNS and domainsearch. I also figured this out when I couldn't ping my own laptops IP address through it's cmdwith IPv4. ipv6 unicast-routing . 0. I realized the S0/ Feb 12, 2012 · Hello, Am trying to simulate ipv6 to ipv4 network . 0 GigabitEthernet1/0. I have stared and looked everywhere I can with no solution. R19#sh run int tunnel 903. On a Windows host we can use the command “netsh interface Apr 29, 2021 · Hi Folks, I am an IPv6 newbie and I have a problem. 1) when i execute show cdp neighbor details it's not showing IPv6 address under this command why? is we need any extra command to tun CDP when using IPv6. The simulated isp will be on ipv4 network which 100. You might just need to refresh it. Check traceroute and see where it dropping. I would suggest a book called IPv6 Fundamentals to learn more about IPv6. Thanks for IPv4 address of the node. PC1 only have an IPv6 address. so if ipv4 can ping both the hub and the other spoke why can ipv6 only ping the hub, but can't ping the other spoke?. Figure 6. R1: interface Loopback0. In this lab I want to set up a Lan-to-Lan VPN with both peer in IPv6, and internal networks still IPv4. 383 UTC HundredGigE0/0/0/31 is Up, ipv4 protocol is Up Vrf is default (vrfid 0x60000000) Internet address is 192. IPv6 is not enabled. default-router 172. I can ping/trace/packetrace from cisco to wan IPv6 adresses or lan adresses, but I can't deseperatly have any access from lan to wan in IPv6 :-/ I have an ASA 5506-X 9. PC-C has the exact problem in reverse. Part 2: Configure IPv6 Static and Default Routes Aug 14, 2012 · here is the Router configuration r1# sh run no ip domain lookup ! ipv6 unicast-routing ! ! ! interface Tunnel0 no ip address ipv6 address 5001::6001/120 ipv6 ospf 100 area 0 tunnel source Serial2/0 tunnel destination 200. uk. the session become ipv4 session only, even no protocol change eon CPE dual Feb 27, 2025 · ip—Use IPv4 to check the network connectivity. Dec 29, 2023 · Compliments, I built a network with both IPv4/IPv6 the Multi switch is configured as the layer 3 router and the (Router) is the external network site. your ip on the 9300 switch is 10. I have successful eBGP IPv6 session with ISP. In the event you can not use dual stack you will use tunneling techniques. DNS works just fine. Apr 28, 2021 · Using IPv6 GUA adresses everything can ping eachother, except PC-B is unable to ping the switch. I can't pull down a /64 subnet from the PFsense to any of the VLAN interfaces. PDF - Complete Book (7. only issue is when i ping router it says request time out. ping DESKTOP-V79DK27. This document is focussed on configuring IPv6 intervlan routing. 114 Mar 31, 2025 · The entire 128-bit IPv4-compatible IPv6 address is used as the IPv6 address of a node and the IPv4 address embedded in the low-order 32 bits is used as the IPv4 address of the node. Jan 5, 2016 · Summary: I have an IPv4 network (completely separate from the IPv6 network) which is fully operational and is configured in an extremely basic way. Nov 23, 2015 · Both IPv4 and IPv6 sessions are up, but there is no connectivity via IPv6. Mar 19, 2012 · Introduction IPv6 host residing in different VLANS communicate via L3 device to route between the VLANS. 8. 82. 192. The Mgmt-intf VRF has been setup with a default route. 19 255. Dual IPv4 and IPv6 Protocol Stack Technique. Can you think of what can happen? I put my configuration in case it helps you to guide me. One of the Server 2008 SP2 boxes also runs DHCPv4 and 6. Show subscribers session does not show the IPv6 address, only IPv4. IPv4 and IPv6 are actually different protocols; so you can't ping an IPv6 address sourcing it from an IPv4 address. Jan 14, 2014 · I used your example and I have an IPv6 address on W7 but no DNS server and ping to BNGs Loopback with IPv6 address is not working. Mar 13, 2018 · Hi, I have a PE with an ipv4 vrf configured: ip vrf internet rd 1:1 route-target export 1:1 route-target import 1:2 Can i configure on another PE the same vrf in this way: vrf definition internet rd 1:1 ! address-family ipv4 route-target export 1:1 route-target import 1:2 exit-address-f Jun 13, 2017 · As i know I can make tunnel IPv4 over IPv4 or IPv6 over IPv4 or IPv6 over IPv6 . Nov 12, 2017 · Hi, This will be my first time setting up IPv6, so I am doing a test first and I have a query to ask the experts here. Inter-vlan routing in configured. They can also ping the outside port (g0/0/0) of the router at it's IPv4 address, but when pinging the IPv6 address, the both receive a request timed out. no ip redirects. I have a problem. All IPv6 traffic must go over the AnyConnect tunnel (ie TunnelAll). are processed by the CPU. In IPv4-only environments, the switch routes IPv4 packets and applies IPv4 QoS and ACLs in hardware. - where is this IP outside network. I do have static routes for the vlan ranges pointing back at the switch. ip nhrp map multicast dynamic. This is true even if ipv6 is not configured for anyconnect. ping ipv6 2001:4860:4860::8888. 52. 8 but can not ping google. Right now the default MTU for IPv6 packet on the Cisco side is 1514b. I could ping all of IPv4 websites but IPv6 websites won't work (DNS issue). However, router R2 is directly connected to R1 and R3 hence it can communicate with both the routers with their Link-Local. ipv6-address—Unicast or Multicast IPv6 address to ping. Switch#reload. Change switches to the netgear and problem solved, everything works. The switch itself can ping both the clients and the cisco inside interface and the cisco can ping the vlan adresses on the switch but not the windows clients. Mar 15, 2020 · Hi, When i ping from pc it says request time out. Between CORE and MLS1 ipv6 doesn't work (ipv4 work) Between CORE and MLS2 ipv6 doesn't work too (ipv4 work) I tried to change the switch model and cable but without success Mar 19, 2015 · New and upgraded applications make use of both the IPv4 and IPv6 protocol stacks (see the figure below). The catalyst switch also has a working ipv6 route out to the internet and I've been able to successfully contact public ipv6 server addresses without issue from the switch CLI (from the switch's ipv6 gateway address on either network). The thing is that IPV6 is not working as expected. Apr 2, 2019 · Can you try specifying the IPv6 address without the prefix mask: ping ipv6 2001:EE:1:1::1 . cheers, Seb. Switch#end. 3(x) Chapter Title. My goal is to get the 2 sep Apr 28, 2021 · Yes, SLAAC will automatically generate a default route for the endpoint ("ipv6 address autoconfig" needs to be set on the network device interface) This may also be a problem with the simulator. Configuring IPv6. payload length=1241 (not include IPv6 header) Data =1233 (bot include ICMPv6 header 8bytes) step-2. OK, seems we're getting somewhere, as the link-local address is marked inaccessible (guess I missed that before!). Feb 2, 2022 · and can ping the servers in the co-location over IPv4, but not over IPv6. x source vlan1 . The problem is, if I use exit interface for both IPv4 and IPv6 default route, R3 and R4 can ping each other with no problem when it's IPv4. Sep 15, 2016 · The clients cannot ping each other (yes - I have the file sharing switched on as they respond happily on ipv4). For example, the TAC has seen cases where an administrator has been assigned a \56 block of IPv6 addresses by an Internet Service Provider (ISP). However, router R2 is directly connected to R1 and R3 hence it can communicate with both the routers with their Link-Local address, because Link-Local addresses are used only within that local network specific to the physical Jul 14, 2020 · It has been assigned an IPv6 address which cannot be reached until the router itself initiates a ping. But, I have an assignment in packet tracer and I can't seem to be able to ping the switch a PC is connected to within my network. Jul 31, 2021 · Hi, I have a dual stack IPV4/IPV6 router/firewall (C892FSP-K9). 223/24 What is the IP on the core you are trying to ping? Can you try pinging the core IP and source it from vlan1. Figure 3-3 IPv4-Compatible IPv6 Address Format . My computer is on the default vlan (1). The Aug 4, 2023 · Hello, a little new to this stuff. ip address 1. I can ping to other PCs which are connect to the switch and its getting reply. I know we're not supposed to have Ethernet interfaces configured as exit interfaces to prevent ARP table overflows and/or prevent performance issues, but I'm just trying to get a proof of concept/to learn and I don't have serial interfaces on my VIRL images. As in IPv4, path MTU discovery in IPv6 allows a host to dynamically discover and adjust to differences in the MTU size of every link along a given data path. My command string is below. The router is behind a French box (Free) giving Internet access. XR1 can ping XR2 just fine, but not R1 . But when using the RV130 on the LAN port as gateway it is not working. 0/16 IF PC1 WANT TO PING TO IPV4 LINK LOCAL ADDRESS TO R1 169. Information About IPv6 MTU Path Discovery. To check the connectivity between two node, we use ping. Use ipconfig and ping to verify LAN connectivity. sh ipv6 int brief outputs: FE80::21D:71FF:FE53:6C00 for Vlan10 interface IP. This comes from Lammle's CCNA book page 574. 255. So if any router can ping this address, it means it can Nov 2, 2023 · Since IPv6 is not backward compatible with IPv4, you are left with the necessity of transition mechanisms, which fall into one of three classes: Dual-stacked interfaces: The simplest solution to IPv4 and IPv6 co-existence (not interoperability) is to make interfaces bilingual, so they can speak IPv4 to IPv4 devices and IPv6 to IPv6 devices. May 6, 2023 · I have a FMC and HA FTD on HA mode version 7. I would prefer to choose only one, at least, for troubleshooting. I have configured IPv6 and everything works fine only locally. demonstrate the connectivity between the routers with Link-Local addresses. I am unable to use serial in this task between the routers. Those ICMP6 types are necessary for the equivalent of ARP in IPv4. I did a packets capture, and I see the neighbor discovery between the server and client. Disable IPv4 addressing and enable IPv6 SLAAC for the PC network interfaces. You will need the 'ipv6 unicast-routing' command applied to you switch if you intend for your PCs to send traffic off-link via the router. PC-C can ping both IPV4 and IPv6 addresses at g0/0/0, but can only ping IPv4 at g0/0/1. 6 and above Cisco ISE can be managed over an IPv6 address, and configure an IPv6 address to Eth0 (Interface) when setup wizard as well as through CLI. Figure 3-3 IPv4-Compatible IPv6 Address Format Unique Local Addresses Dec 4, 2023 · However for some reason despite IPv6 communicating across the network, only IPv4 has issues. 4. ping コマンドは、引数として宛先の IPv6 アドレスまたは IPv6 ホスト名を受け入れ、Internet Control Message Protocol version 6（ICMPv6; インターネット制御メッセージ プロトコル バージョン 6）エコー要求メッセージを指定された宛先に送信します。 Feb 11, 2016 · An account on Cisco. Any help would be greatly Jul 10, 2023 · the tunnel. local [fe80::cd84:26d9:6b40:339b%13] with 32 bytes of data: Ping reply with IPv6 address, not IPv4. IPv4 piece is already up and running in the network and nothing needs to be done on IPv4 side R1 is connected to IPv6 Internet. PC is connected to switch and switch is connected to router. The DNs server is connected via INSIDE interface only. on this link if we have ipv4 link local address not ipv6 link local address IPV4 LINK LOCAL ADDRESS RANGE FROM 169. ipv4-address—IPv4 address to ping. Enable IPv6 unicast routing and configure IPv6 addressing on the routers. Communities: Recursos Educativos | | ipv6 address 2001:0:255::2/64 I can ping the ipv4 address but not the ipv6, unicast-routing is enabled. Really having trouble figuring any of this out, I can't check ARP if that helps at all. PC ---------- Router Router G0/0 interface = 192. 2. 1st question at step-2 . i am also using management interface. 6(1), ADSM 7. The format of IPv6 Ping is a little difference than IPv4 Ping. 16. i saw they are differents solutions, but i don't find any forums or website to explain how to configure a routeur in NAT-64. Try this last test -> ping some internet address from your 3750, if it fails, ping address of 4507 switch. Paciello. Nov 26, 2018 · I am trying to configure a multilayer switch with a router in IPV6 but it seems that my configuration is not good because it's impossible for me to ping the router. ipv6 unicast-routing! interface GigabitEthernet0/0 no ip address duplex auto speed auto ipv6 address 2001:2::2/64 ipv6 rip rip enable ! ipv6 router rip rip . Mar 31, 2011 · Thanks for this article, I'm trying to have a functional IPv6 config. but I can give prefix in Windows 7 machine. 168. x. OTOH, the link-local ip is pingable: sw01#ping ipv6 FE80::20C:42FF:FE54:EFA8 Output Interface: vlan311 Type escape sequence to abort. The solution known as Intervlan Routing or Router on stick, a very well known solution of IPv4. 6(1) with a Bbox3 belgacom/proximus in front of it. Feb 17, 2021 · Clients in this VLAN get an IPv6 address, and when checking the status of the ipv6 DHCP pool it shows active clients. Sending 5, 100-byte ICMP Echos to 172. Some of the clients on the network have both auto-assigned IPv6 addresses and static IPv6 addresses, but I see the same ping behavior regardless of whether the client has a static IPv6 address or not. 1. Mar 26, 2012 · Today when I came to office, everybody was screaming because they all lost IPv4 connectivity, hosts can not get IPv4 DHCP address anymore. Mar 31, 2024 · Thank you, ipv6 internet connectivity its now working on devices connected to my g0/0/1 interface but the devices on the vlan 88 g0/0/1. Because PC0 does not have an IPv6 address, PC1 cannot communicate with it and vice versa. Unique Local Addresses Mar 13, 2018 · i am also getting the same issue. I have reviewed your exercise and the IPv6 ping is successful. 40. within the same layer2 segment,no device should send frames, that are to large for other devices, so every device which generates new frames should best be configured to the same MTU. 2. network 172. 1for both. The IPv6 addresses used in your setup should be registered IPv6 addresses. The WLC management IP address can either be IPv4 or IPv6, it does not matter as long as the address is reachable. 23. All pings are working except the Router to Multi switch IPv6 ping the two interfaces have the same link-local address but the IPv4 can ping the same interface, please advice. My Cisco ASA is connected to an access port on the 3850 on port 48 and is on vlan 192. Mar 31, 2025 · Router# show ipv4 interface HundredGigE 0/0/0/31 Mon Sep 30 09:49:10. But it did not do that in my case. It is not possible to add both the IPv4 and IPv6 address because only one entry is allowed per WLC. So to sum up, the AnyConnect client does not support split-tunneling of the IPv6 traffic. IPv4-compatible IPv6 addresses are assigned to nodes that support both the IPv4 and IPv6 protocol stacks and are used in automatic tunnels. I was thinking dot1q tunnel is layer 2 and Nov 10, 2016 · Another weird issue I'm seeing now if I have 2 machine elsewhere on the network which can't ping my test laptop via ipv6 (ipv4 is ok) but my laptop can ping both of the other machines. dns-server 172. Building configuration Current configuration : 371 bytes! interface Tunnel903. Or, you can give them both either ipv4 or ipv6. interface Tunnel6 I can ping the router via IPv4, and clients get an auto-assigned IPv6 address from the correct subnet just fine. Here is my Cisco configuration: May 19, 2010 · The IPv6 for Cisco IOS software feature documentation provides implementation and command reference information for IPv6 features supported in the Cisco IOS software. 04. the LAN-ROUTER will be on ipv6 network but the link that connects ipv6 to ipv4 will be on 100. Dec 23, 2021 · In most cases, Cisco Identity Services Engine can be configured with an Ipv4 address to manage ISE through User interface (GUI) and CLI log in into Admin Portal, however, from ISE version 2. Switch#sdm prefer dual-ipv4-and-ipv6 routing. ip address 10. 3 Sep 27, 2018 · In you case many reason i can think of. ==> the laptop will take new ipv6 address and it works . I am not able to give prefix length in Windows XP. 254. In dual IPv4 and IPv6 environments, the switch applies IPv4 QoS and ACLs in hardware . ip cef ipv6 unicast-routing ipv6 cef ! ! mu Apr 15, 2020 · I've got a Cisco Catalyst 3850 switch setup for ipv6 unicast-routing and have two networks setup on it. For IPv6, use the first /64 subnet from the 2001:0db8:acca::/48 subnet. One application program interface (API) supports both IPv4 and IPv6 addresses and DNS requests. When the router checks the IPv6 routing table, it won't find any IPv4 routes and vice versa. I have set the VLAN up and the default gateway to the router the switch is connected to, and I can ping the router from the switch, but I can't ping the switch or router from a PC. But ping won't work when it's IPv6. Figure 3-3 shows the structure of an IPv4-compatible IPv6 address and a few acceptable formats for the address. As IPv4, with IPv6, we also use ping, but this time it is called IPv6 Ping. The servers get an IPv6 address through the dot1q tunnel from the router interface per stateless address autoconfiguration, but I can't reach the servers over IPv6. 20. Sep 13, 2013 · ipv6 route yyyy:yyyy:100::10:0:1/128 Vlan10 FE80::219:7FF:FEFE:FC00 . Mar 14, 2025 · IPv6 Ping. . Oct 14, 2021 · R1 is sending ping with size=1281 bytes. They can ping eachother, but not the IOS-XRv's. Thanks I can't get an IPv6 address on the VLAN1,2,3, or 4 interfaces on the Cisco via DHCPv6. Here are the configuration that i've made: Switch> enable. In both the cases, specific address is mapped to specific ports. If I ping from outside, I can't get access. The History. uk with working IPv6, you should normally see it using IPv6 unless you do ping -4 google. It all works. I would like to do the same for the IPv6 packets. The DNS is not resolving through the INSIDE or OUTSIDE interfaces. 0 0. Between the servers on each site of the tunnel IPv6 is working. Dec 24, 2012 · Introduction This document provides sample configuration of IPv6 6to4 tunneling in Cisco IOS routers. 10. Here is my config: pool vrf ipoe ipv6 IPoEv6_POOL Aug 24, 2023 · > can ping "2001:db8:1::8. Can you post the port config on the core where the 9300 is connected? HTH Internet Control Message Protocol (ICMP) ping and traceroute are used to help diagnose the root cause when a forwarding failure occurs. Apr 17, 2015 · PCs are connected to Cisco switch and up link goes to Cisco 1841 router on router LAN side interface f0/0 ip add: 2001:xx:xx:xx:1000::64/120. output of ipconfig from pc1: Eth Oct 4, 2015 · Hi all, I am trying to ping my router from a PC that has an ipv6 address. 3. Jul 31, 2021 · Sorry for the translation, I'm Spanish. However it seem like that's only supported with the lanbase-routing template. 2 log-adjacency-changes ! end IPv6 uses Neighbor Discovery Protocol (similar to arp for IPv4) to discover it's neighbor's layer 2 address. IPv4 users can move to IPv6 and receive services such as end-to-end security, quality of service (QoS), and globally unique addresses. I have observed only the issue with IPV6 ICMP, as i can run HSR Pfor IPV6 via ethernet switch module in 2911. Jun 29, 2015 · Many IPv6 TAC cases are generated due to a general lack of knowledge about how IPv6 functions, or due to administrator attempts to implement IPv6 with the use of IPv4-specific processes. Switch>enable. com 443 /ipv4. And a Router connected into g1/0/24 - vlan 100 . Kind regards, Milos May 14, 2023 · If you’re using a Cisco device, you can ping IPv6 addresses from its command line. I suspect that DAD is some how failing and so the asa maybe decided not to enable the IP ???? No. Use show commands to verify IPv6 settings. The topology is one PC connected to a router. Dec 14, 2022 · Basically, it will instruct ASA to bypass all settings for IPv6 traffic, if it has only IPv4 traffic, and vice versa. com from a VM, even though I can ping it from the household. address as the tunnel destination. I also added records in the DNS server for each device so I could test pinging by name resolution and this also works. Communities: Recursos Educativos | | Dec 30, 2019 · Hi @longle001 . I can't get IPv6 addresses on any device on a VLAN other than 5. ip route 0. Not all IPv6 features are supported on the Catalyst 4500 and Catalyst 4900 series switches. 21 MB) PDF - This Chapter (1. (both peers are in dual-stack) According to the Cisco documentation it should works : Oct 29, 2024 · The routers R1 and R3 can ping each other with the IPv6 local unicast address, but not with their Link-Local address. Jan 3, 2022 · Hi all, -I'm trying to configure a interface loopback under default vrf Mgmt-vrf and the follow log appears: %IOSXE_MGMTVRF-3-INTF_ATTACH_FAIL: Management VRF attach to mgmt loopback failed %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback100, changed state to up %LINK-3-UPDOWN: Interface ipv6 icmp permit any neighbor-advertisement INET-IPV6. There is no problem with IPV4 but only with IPV6 ICMP. I can ping the link local ips from each respective router to the other but I cannot ping the loopback interface IPs from the either router to the other. I can ping public IPv6 DNS server from the Transit Router however, Two Win2k8r2 nodes on the same switch, just like your scenario: (Open in new window if the image is not large enough) There can only be two things stopping you at this point that I can think of: Either you have a really gimpy switch that won't switch IPv6 packets, or (most likely) you have ICMPv6 blocked by the Windows Firewall on your clients. cisco. Here is the default routes on R3 and R4: R3# R3#show run | inc route. I use packet8. The pc's connected through a switch. These differences are the format of the used IP address and the used keywords. An application can be upgraded to the new API and still use only the IPv4 protocol stack. I added another host with an IP in the same vlan and connected Oct 19, 2010 · All are assigned static IPv4 and IPv6 addresses. Jul 10, 2013 · If you try to configure IPv6 without first selecting a dual IPv4 and IPv6 template, a warning message appears. 0/24 private range. Sep 7, 2012 · Yet, it is not because there is no MPLS label mapping towards the IPv6 next hop address but merely because the IPv6 CEF is not willing to create an adjacency towards a VPNv6 route if the next hop is an IPv6 address. IPv6 – Part I. Failed to initialize a component [Failed to execute 'invoke' on 'CreateScriptCallback': The provided Apr 17, 2020 · Hello everyone, I'm having an issue with the Smart License registration on a 9200 Stack running Version 16. They have been with us since the very beginning, they were there during the 1980`s when everything was calm, and they stuck by us during the chaotic growth of the Internet during the 1990`s. I have encountered a problem with SSH on Packet Tracer. This page has an error. I've both tried setting up the IPv6's on the local lan hosts using Dec 27, 2023 · In this scenario IPv4 and IPv6 cannot communicate. written by Gerald C. I have set it to auto config for ipv6 addressing on the PC, it has gotten an address but unable to ping to the router. If I ping by name, I am typically returned the IPv6 address of that Dec 18, 2012 · Similarly You can ping from multiple IPv6 addresses (using the source as Loopback address) to the IPv4 side. Here's the routing table. 0 255. The ping to IPv4 is not, because it is possible that IPv4 is not allowed in the cloud devices, since it is specified under the PC that this client is only for IPv6. For IPv4, use a /28 network from the 192. ipv6 route ::/0 GigabitEthernet1/0. The traffic to IPv6 destinations will not be natted though. I have enabled ipv6 routing with ipv6 unicast-routing. will receive IPv4 packets and the IPv6 packets encapsulated into them . 1 tunnel mode ipv6ip ! interface Loopback0 no ip address ipv6 address 2001 Ok, My entire network can ping ipv4 now. The architecture of IPv6 has been designed to allow existing IPv4 users to make the transition easily to IPv6 while providing services such as end-to-end security, quality of service (QoS), and globally unique addresses. Jan 23, 2014 · I can seccessfully connect a client machine, it receives a DHCP address from a Windows DHCP Server. I have ipv6 unicasting enabled and I have been pinging it without the prefix. From the client I can't reach the default gateway. Make sure you configure a default route for both IPv4 and IPv6. R3 send packet too big message back to R1 . Switch# Apr 26, 2014 · I am configuring IPV6 in GNS3 lab environment for studying and when I configured the IP address, in Fa0/0 and S0/0 on both routers (R1 and R4) the Serial interface goes UP/UP for a few seconds and then it goes UP/Down and I am unable to ping the other side of the Serial Interface. net IPv6 Tunnel on my router which has two WAN ports. . I think that there might be an issue with the IPv6 address itself (2001:db8:acad:A::1/64), but I am not sure. - reasons may be you are not allowed ping - may be any ACL in place. Aug 27, 2021 · Hi. 10/29 network. com" The principle of NAT64 is that traffic to IPv4 destinations will be natted using the registered IPv4 addresses towards the Internet. I can also ping ipv6 anywhere except to my vlans. com it is successful via ipv4: ROUTER# ping tools. PC0 only has an IPv4 address. if IPv6 over IPv4: ipv6 nhrp map multicast 10. 114 Type escape sequence to abort. Any suggestions? I have the necessary ipv6 enable, unicast-routin Cisco Learning Network Store Certification Tracker Cisco Learning Network Podcast. Dec 18, 2018 · So if your network does not have IPv6 then use the /ipv4 flag to the command: telnet tools. if IPv6 over IPv6 Jan 14, 2014 · 1) if the CPE dual stack reboot, it take new public IPv4 address, but keep ipv6 subnet provided before reboot. I can also ping IPv6 only hosts on the internet on the RV130 using the Diagnostics ping tool (I can ping ipv6. 16 May 31, 2017 · Hi, i asking you for an advice, i'm actually in trainsheep and i've to configure a routeur Cisco ASA 5506-X and I want to ping an IPv6 machine with an IPv4 machine. 57 MB) Jan 28, 2020 · Solved: Working on my CCNA and studying IPV6. Oct 29, 2024 · hostname R2 ! ipv6 cef ! ipv6 unicast-routing ! ! ! interface Serial0/0 no ip address ipv6 address 2001::2/124 ipv6 ospf 1 area 0 clock rate 2000000 ! ! interface Serial0/1 no ip address ipv6 address 2002::1/124 ipv6 ospf 1 area 0 clock rate 2000000 ! ! ! ipv6 router ospf 1 router-id 10. since we do not know your topo hard to say at the moment. If you need to see the IPv4 address of a remote device Sep 25, 2012 · I am running IPv4 and IPv6 in the dual stack. > > ping 172. Now my understanding about "Happy Eyeballs" is that if Ipv6 is not reachable it will fall back to Ipv4 auto. I was hoping to be able to do some very basic ipv6 routing with the dual-ipv4-and-ipv6 SDM template. 254 255. How to Force Ping to Return IPv4 Address on Windows. URLs with literal IPv6 addresses must be specified in hexadecimal using 16-bit values between colons. The strange thing is that all clients are able to ping IPv6 hosts on Internet, but my router cannot ping anyone. The accept socket call chooses an IPv4 or IPv6 address family. google. Here are some show commands. That means if you ping google. Mar 6, 2013 · versions. With this one, you should configure only IPv4 on your device (remove all IPv6 configuration, if you are not actually using IPv6), and add this option under group policy. The Firepower can ping the DNS server as shown below, but the DNS is failed. Can you show us the output for show ipv6 route? Note, that with IPv6, there is no "fragmentation on the way", IPv6 always works as IPv4 with "DF-Bit set". Mar 10, 2025 · ! ! interface GigabitEthernet0/0/0 ip address 10. Jun 12, 2023 · Can you help with this lab? Configure IPv4 and IPv6 connectivity between two routers. If you have working IPv6 and are pinging a site that has AAAA and A records, windows by default prefers IPv4. Am I missing but all the ping response info is in terms of IPv6 addresses, not IPv4 as it normally is. I can't ping -6 google. And from one client, I can see the Renewal message from another client and I can see Multicast Listener Report Message v2 from another client, but there's no solicit message from the other client. I can not ping across router c, so A and B can't ping D or E, and vice versa. ipv6 address 2001::1/128! interface Jun 10, 2021 · The HTTP client sends requests to both IPv4 and IPv6 HTTP servers, which respond to requests from both IPv4 and IPv6 HTTP clients. Oct 23, 2013 · But when i use Cisco 2911 with ethernet switching card then it is not working (Unable to ping (IPV6) between 2 routers). i can ping from Expert mode but i cannot ping from FTD CLI or diagnostic mode. In the attached file is the network I am working on. for cross check i have configure ipv4 address and it's showing but no ipv6. When the IPv6 address is a Link Local address (IPv6Z address), the outgoing interface name must be specified. I could recive the Internet table and my IPv6 subnets are announced too. 180. I added ipv6 point-to-point ip on the same interface as ipv4, as shown below, and suddenly face with some packet loss. 254 . The switch and router are connected with OSPF. 2) and one host behind each ASA. Sometimes, you might need to ping an IPv6 address using an online tool. When using simulation mode, the ICMP packets seem to reach the switch from PC-B, but are dropped by the switch. CPE gets prefix, address and default route from BNG, but actually cannot access internet using IPv6 while BNG can. Jun 7, 2023 · The IPv6 ping for port G0/0/1 is OK as it is an IPv4 ping to port G0/0/0. How to ping IPv6 addresses online. Same for the CSR1000V's. All three IPv6 addresses are pingable from the outside world. I configured IPV6. ping x. Mar 6, 2018 · I finally figured out how to get IPv6 on my outside and inside interfaces of my router (Cisco 2821) and on the uplink port on my switch (Cisco 3750). So we are running out (have ran out?) of IPv4 addresses. Just log in and use ping ipv6 followed by the IPv6 address you want to test. When I try to configure, I get the dreaded "Invalid input detected at '^' marker. Jun 5, 2017 · IPv6 における ping および traceroute コマンド . R3# In IPv4 we could fragment in path. com is not required. The firewall on the laptop is disabled. com I configured a HE. We have been using an ASR1001-X as our Border/Transit router successfully on IPv4 running eBGP and internally to L3 Switch using OSPF. Apr 28, 2018 · ipv6 address 2001:2::1/64 ipv6 rip rip enable ! router rip! ipv6 router rip rip. Apr 3, 2018 · Can you make sure vlan 1 is up and running? sh int vlan 1 or sh ip int brief vlan1. ip nhrp network-id 99 May 20, 2011 · We can use ping to verify IPv6 connectivity to the other nodes on a LAN and then check the neighbor cache (like the IPv4 ARP cache). 0 negotiation auto ipv6 address FE80::2:1 link-local ipv6 address 2001:DB8:A:B::2/64 ipv6 dhcp server LAN6_A no shutdown ! interface GigabitEthernet0/0/1 no ip address negotiation auto no shutdown ! interface GigabitEthernet0/0/2 no ip address negotiation auto no shutdown Nov 13, 2023 · IPv4 Configuration Type: PPPoe IPv6 Configuration Type: SLAAC LAN === IPv4 Configuration Type: Static IPv4 IPv6 Configuration Type: Track Interface. Pinging DESKTOP-V79DK27. Hi all, I have configure small network and connect two offices to each other, this is a IPv6 network here is problem i have been facing. The symptom: No incoming traffic is going through the router from internet (behind the box)??? To b May 3, 2013 · Solved: Hello, I'm trying to configure PPPoE in IPv6 on a Cisco Router 7301 (without RADIUS) but it doesn't send DNS(ip name-server) and an IPv6 configuration from the pool (Windows 7). Mar 2, 2012 · I’ve changed the MTU value for IPv4 on both sides (set to 1414b), after this change ping (ipv4) is now working fine with any packet size. The routers R1 and R3 can ping each other with the IPv6 local unicast address, but not with their Link-Local address. I´m even able to ping the Ipv6 subinterface so to speak, created on the multilayer switch. Mar 31, 2025 · [cancel]:y RP/0/ RSP0 /CPU0:router # show ipv6 interface gigabitethernet2 /2/0/0 is Up, line protocol is Up IPv6 is disabled, link-local address unassigned No global unicast address is configured gigabitethernet2 /2/0/1 is Up, line protocol is Up IPv6 is enabled, link-local address is fe80::203:fdff:fe1b:4501 Global unicast address(es): 1:4::1 I have a problem that I can't seem to solve, I can't ping in ipv6 on two neighboring interfaces : Between Gig/0/0/0 and Fa0/1 --> PING IPV6 OK and IPV4 OK. ipv6—Use IPv6 to check the network connectivity. ipv6 の pingコマンド ipv4アドレスの場合、1つのインターフェースに1つのipアドレスが設定します。一方、ipv6アドレスの場合、 1つのインターフェースに複数のipアドレスが設定されます。通常、自動で設定されるリンクローカルアドレス I already sdm prefer dual Ipv4-ipv6 defaultIp routingIPV6 unicast-routingI{m using a multilayer but it happens also in an on-stick topology, I don´t understand why I can ping everything but not the IPV6 address of the management Vlan. 6to4 Tunneling is one of the IPv6 translation mechanism which encapsulates the IPv6 packets into IPv4 which allows remote IPv6 networks to Feb 14, 2024 · But I can't ping the clients from each other. Tracking interface for LAN seems to be working as I am getting /64 prefix IPv6 on LAN as well; I cannot enable Router Advertisement, as soon as I enable it, I loose IPv6 on the LAN interface Feb 13, 2021 · I have a Cisco 3850 switch with IP services. you have route does not mean you can always reachable. The weird thing is I configured a different switch to the same router with the same config and ipv6 connectivity works great, but i cant figure out why this specific connection wont work. 1/24 MTU is 1514 (1500 is available to IP) Helper address is not set Directed broadcast forwarding is disabled Outgoing access list is not set Inbound common May 20, 2020 · I can set a a IPv6 address here or obtain one with DHCPv6 which both works fine. Routing table: Ping reply with IPv6 address, not IPv4, since the IPv6 protocol takes precedence over IPv4. Prerequisite IPv6 Addressing Sc Jan 16, 2011 · 4) i used debug bgp ipv6 unicast and debug bgp ipv6 unicast updates. lol As part of a class, in Packet Tracer, I have to configure a Cisco 2960 for ipV6. From what I can tell my syntax is correct. 1. BNG cannot ping subscriber's connected address, as well as subscriber cannot ping BNG's link local address. 88 interface are not getting an IPV6 address. I had to remove all IPv6 configuration to recover. When testing connectivity from a directly connected switch on the same subnet in the same VLAN the pings fail unless the ISR starts a ping itself from then the ping from the switch to the Nov 28, 2018 · Understanding IPv6; Default IPv6 Configuration; Understanding IPv6. All ip address are IPV6 and default gateway is Cisco Learning Network Store Certification Tracker Cisco Learning Network Podcast. 36. Feb 20, 2025 · ip—Use IPv4 to check the network connectivity. Here all three configured together. 3. Using Ethernet0/1 on routers R1 and R2, configure the next usable /2 Aug 13, 2014 · When selecting a primary, secondary, or tertiary controller, the process is similar to CAPWAPv4. Mar 28, 2013 · That can be caused be configuration applied by your ISP, for security reasons int Vlan 176 on 4507 can be passive so you are not able to establish neighborship. However, ping and traceroute might not detect LSP failures because an ICMP packet can be forwarded through IP to the destination when an LSP breakage occurs. My topology looks like: Logically, wanting it to look something like: Using R1 and XR1 as examples, here's the interface configs. step-3 Jun 29, 2007 · The security appliance supports the configuration of both IPv6 and IPv4 on an interface. Enable ipv6 unicast-routing and create a tunnel interface, assign an IPv6 address to it and set an IPv6 capable router's IPv4 . If you are not supporting IPv6 over the tunnel, you will not be able to access IPv6 resources when connected. Here's the configuration: network 172. ipv6 header = 40 . May 17, 2015 · Hi Chintan, I've not had any experience of the SG300, but it is 'IPv6 ready' according to Cisco brochures. 1 255. I can ping the address on either end and get a reply I can ping both ipv4 and ipv6. vejmx mza plgoq twblb rnrpuepz pwl ltmibwo qxsue hbgkc lagf