After spending the weekend deploying IPv6 on an MX using a provider independent IPv6 allocation, I've come away wondering why enterprise IPv6 still feels like an afterthought in 2026.Good:SLAAC works.Clients immediately receive global IPv6 addresses....
Forum Posts
Hi Everyone,I'm troubleshooting a Stateful NAT64 deployment on a Cisco ASR1002-HX running IOS-XE 17.09.05e. After extensive troubleshooting, I'm unable to identify the root cause and would appreciate any suggestions from the community.EnvironmentCisc...
Hello all,I have a question regarding an SRv6 deployment.On a Cisco N540-12Z20G-SYS-D running Cisco IOS XR Software Version 25.4.1, what is the recommended way to verify whether traffic is actually being forwarded over an SRv6 TE policy?I would like ...
Platform: Cisco Catalyst 8000 Edge (c8000aep), IOS XE 17.9.5f Scenario: L2TP LNS terminating wholesale PPPoE/PPP subscriber sessions (multiple vpdn-groups), dual-stack IPv4/IPv6, IPv6 prefix delegation to subscriber CPE via DHCPv6-PD, sourced from RA...
Resolved! DHCPv6 relay agent mechanism
in IOS XE, the DHCPv6 relay only requires one command: ipv6 dhcp relay destination 2222:db8:0:22::24it does not require setting M flag and the client receives only A flag from the relay agent.ICMP6, router advertisement, length 64hop limit 64, Flags ...
We are testing IPv6 in our environment. We are experiencing an issue with default gateway on end devices with static IP address. The end devices do not pick up the IPv6 default gateway on the 9200L switches. The end devices connected to other switch...
Resolved! OSPFv3 no connection!
Hello allI tried to test OSPFv3, but it has no connection bitween each other.What should change?Thank in advnace'''''''''''''''R0#ipv6 unicast-routing!interface GigabitEthernet0/0ipv6 address 2000:ABCD:1111:A:1::/64ipv6 enable!interface GigabitEthern...
Resolved! BGP Link-Local Address Peering
Hi, Can someone help me understand what I am doing wrong here? I try to configure eBGP using this guide: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-16/irg-xe-16-book/ipv-routing-multiprotocol-bgp-link-local-address...
Resolved! IPV6 and RIP v6 no PC´s connect!
HelloThe PC0 ip address 2000:1111:ABCD:2:11::/64 can not connectThe PC1 ip address 2000:1111:ABCD:3:11::/64. What should I change?Thanks in advanceQu R1#ipv6 unicast-routinginterface GigabitEthernet0/0/0ipv6 address 2000:1111:ABCD:1:1::/64ipv6 rip 1 ...
Hello everyone, I’m looking for guidance on an IPv6 issue that appeared after upgrading a VMware vDS to version 7.x. After the upgrade, all VMs running on multiple Cisco UCS domains lost IPv6 connectivity (cannot ping or reach any IPv6 hosts). IPv4 c...
Resolved! Catalyst 8200/8300 and NAT64
Hi everyone I have a server on the internal network that needs to be published with an IPv6 address. Therefore, I need a device that can perform IPv6 to IPv4 translation for me. It's for a single IPv4, so I need it to be the smallest device. I under...
TL;DR: After migrating from ASR9Ks to NCS-57B1s (IOS-XR 7.10.2), four IPv6 PNIs to the same provider flap across four different devices. ND stays REACH, but IPv6 echo and BGP TCP/179 stall. Clearing the IPv6 neighbor cache brings it back for ~4–5 min...
Hello All,I'm a bit confused on the use cases for this and whether they can be used interchangeably or not. My current configuration is legacy to me for Stateful IPv6 DHCP and includes the following configuration:ipv6 nd prefix default no-autoconfigi...
I initially thought that the EUI-64 address was generated directly from the MAC address and immediately applied to the IPv6 address I configured. However, after comparing the addresses, I realized that the process is a bit more nuanced.The link-local...
I have a Cisco FPR3100 firewall configured in ASA mode. Outside interface IP is 202.100.100.1/28 and 2607:f8b0:4006:809::2003/122. Inside interface IP is 10.0.10.3/26. Server connected to internal interface IP is 10.0.10.4. Currently Server is commun...
