0
votes
1answer
97 views

Cisco IOS: Prevent Inter-VLAN IPv6 Network Solicitation messages

I have a Cisco 3825 router that (among other things) functions as a gateway to the internet. I have two VLANS, but only one of them should have access to the internet. VLAN10: network = ...
1
vote
1answer
172 views

Many 'Deny IPv6-ICMP reverse path check' alerts from multicast addresses on Cisco ASA

In an effort to prevent IP Source Address Spoofing (RFC 2827) I've enabled reverse path filtering (RPF) on my Cisco ASA 5505. The topology is aprox. like this. Each segment has its own IPv4 subnet ...
0
votes
1answer
199 views

Is it possible to configure a Cisco router to serve as a Teredo relay?

The router in question is a Cisco 871, show version as follows: Cisco IOS Software, C870 Software (C870-ADVIPSERVICESK9-M), Version 12.4(24)T8, RELEASE SOFTWARE (fc1) Technical Support: ...
1
vote
2answers
146 views

ipv6 Unrecognised Command on Cisco 3400

I have two identical Layer 3 switches, running identical Cisco IOS Versions. One of the switches, I can configure with ipv6. The other switch however, tells me "Unrecognized command" when I try any ...
1
vote
1answer
184 views

Cisco EEM Not Firing All Steps

I have a Cisco 887 as our primary router; it is configured for dual-stack. There is a small 'catch' with our ISP's IPv6 configuration though; after the connection is established, we must perform a ...
3
votes
1answer
270 views

Cisco 1721 router IPv6 interface stuck at [TENTATIVE]

In our network, we have several Cisco 1721 routers located at branch offices connected back to the main office via T-1 circuits. All the 1721s are running the same IOS and configured the same, with ...
0
votes
1answer
142 views

IPv6 routing to another interface

I'm trying to get an IPv6 enabled router to forward data from one interface to the other and I'm having issues. When following this example ...
1
vote
1answer
394 views

Cisco 877 responds to IPv6 ping from internet, doesn't respond to internal clients

I've got a strange issue with a Cisco 877 and ipv6. My ISP provides me ipv6 connectivity natively, and the router is configured with the first address of the subnet I'm provided. On my network are ...
0
votes
1answer
229 views

Routing IPv6 through a Cisco RV042 in gateway mode

I am having some difficulty routing IPv6 through a Cisco RV042 in gateway mode. I am attempting to simulate a small IPv6 WAN between two offices using a /48 prefix. Nothing I do in the advanced ...
5
votes
2answers
566 views

ScreenOS ip6in4 tunnel over transport mode ipsec?

I have setup a point to point transport ipsec session between a ScreenOS router (SSG-5) and a Cisco 3925. The ipsec transport itself works great, but as soon as I try to direct the protocol 41 ...
0
votes
1answer
2k views

Can't enable IPv6 in Cisco 2800 router running IOS 12.4T

I can't enable IPV6 in a Cisco 2800 router that runs iOS version 12.4T. I followed the summary steps section in Cisco's web page . But whenever I type "ipv6" on the command line (as in 'ipv6 ...
3
votes
1answer
621 views

Cisco router not replying to IPv6 neighbor solicitation requests

With one of our network providers our Linux based router (Vyatta/Debian) can't talk to their Cisco router over IPv6. Their router seems to not reply to the ICMP6 neighbor solicitation requests that ...
14
votes
5answers
1k views

IPv6: How to start? (ISP perspective)

In our company we have a range of /21 (2048) IPv4 public addresses. We have a bunch of Cisco routers and servers. How to get started with IPv6? What can we do to provide internet to our clients with ...
2
votes
1answer
560 views

Redistribute OSPFv3 static route to RIPng

I have a IPv6 static route on a Cisco 2600 that is being redistributed to other Routers in the same OSPFv3 area. One of the routers (not the one with the static route) is also a participant in a ...
3
votes
1answer
2k views

Cisco ASA and static IPv6 tunnel endpoint?

I recently installed a Cisco ASA 5505 firewall on the edge of our LAN. The setup is simple: Internet <--> ASA <--> LAN I would like provide the hosts in the LAN with IPv6 connectivity by ...
2
votes
2answers
1k views

Basic IPv6 firewall on Cisco IOS for small network

Now that I have IPv6 connectivity to my network, I'm looking for a basic IPv6 firewall configuration for IOS. It used to be that we could rely on NAT to 'hide' internal (read: outgoing connections ...