nanog mailing list archives
Re: Automatic IPv6 due to broadcast
From: Ray Soucy <rps () maine edu>
Date: Tue, 17 Apr 2012 06:54:27 -0400
You have a rogue IPv6 router on your network. It's not a host problem. It's along the lines of having a rogue DHCP server on your network but faster propagation. It needs to be tracked down and disabled. You can use tcpdump (as root) to capture IPv6 RA and see who's doing it, and what's being advertised: tcpdump -ni eth0 'ip6 dst ff02::1' 06:48:48.044409 IP6 fe80::2d0:1ff:fedf:8400 > ff02::1: ICMP6, router advertisement, length 64 Then look at your IPv6 neighbor table for the MAC of that host: ip -6 neigh show fe80::2d0:1ff:fedf:8400 dev eth0 lladdr 00:d0:01:df:84:00 router REACHABLE Once you have the MAC, track it down and disable it. On a Cisco device "show mac address-table" (or "show mac-address-table" on older hardware). -- Ray Soucy Epic Communications Specialist Phone: +1 (207) 561-3526 Networkmaine, a Unit of the University of Maine System http://www.networkmaine.net/
Current thread:
- Automatic IPv6 due to broadcast Anurag Bhatia (Apr 16)
- RE: Automatic IPv6 due to broadcast Matthew Huff (Apr 16)
- Re: Automatic IPv6 due to broadcast Seth Mos (Apr 16)
- Re: Automatic IPv6 due to broadcast Valdis . Kletnieks (Apr 16)
- Re: Automatic IPv6 due to broadcast Arturo Servin (Apr 16)
- Re: Automatic IPv6 due to broadcast Carlos Martinez-Cagnazzo (Apr 17)
- Re: Automatic IPv6 due to broadcast Seth Mos (Apr 17)
- Re: Automatic IPv6 due to broadcast Ray Soucy (Apr 17)
- Re: Automatic IPv6 due to broadcast Jared Mauch (Apr 17)
- Re: Automatic IPv6 due to broadcast Mick O'Rourke (Apr 17)
- Re: Automatic IPv6 due to broadcast Anurag Bhatia (Apr 17)
- Re: Automatic IPv6 due to broadcast Carlos Martinez-Cagnazzo (Apr 17)
- Re: Automatic IPv6 due to broadcast Valdis . Kletnieks (Apr 16)
- Re: Automatic IPv6 due to broadcast Måns Nilsson (Apr 16)
- Re: Automatic IPv6 due to broadcast Carlos Martinez-Cagnazzo (Apr 17)
- Re: Automatic IPv6 due to broadcast Joel jaeggli (Apr 22)
- Re: Automatic IPv6 due to broadcast Grant Ridder (Apr 22)
- Re: Automatic IPv6 due to broadcast Jimmy Hess (Apr 22)