Automatic IPv6 due to broadcast
Matthew Huff
mhuff at ox.com
Mon Apr 16 18:24:51 UTC 2012
To completely disable ipv6 in Redhat:
1) Modify /etc/modprobe.conf (add)
alias ipv6 off
alias net-pf-10 off
options ipv6 disable=1
2) Modify /etc/sysconfig/network (add)
NETWORKING_IPV6=no
I usually also add
NOZEROCONF=yes
That should completely disable ipv6 in Redhat 5.x
----
Matthew Huff | 1 Manhattanville Rd
Director of Operations | Purchase, NY 10577
OTA Management LLC | Phone: 914-460-4039
aim: matthewbhuff | Fax: 914-460-4139
> -----Original Message-----
> From: Anurag Bhatia [mailto:me at anuragbhatia.com]
> Sent: Monday, April 16, 2012 2:10 PM
> To: NANOG Mailing List
> Subject: Automatic IPv6 due to broadcast
>
> Hello everyone
>
>
>
> Just got a awfully crazy issue. I heard from our support team about
> failure of whois during domain registration. Initially I thought of
> port 43 TCP block or something but found it was all ok. Later when ran
> whois manually on server via terminal it failed. Found problem that
> server was connecting to whois server - whois.verisign-grs.com. I was
> stunned! Server got IPv6 and not just that one - almost all. This was
> scary - partial IPv6 setup and it was breaking things.
>
> In routing tables, routes were all going to a router which I recently
> setup for testing. That router and other servers are under same switch
> but by no means I ever configured that router as default gateway for
> IPv6. I found option of "broadcast" was enabled on router for local
> fe80... address and I guess router broadcasted IPv6 and somehow (??)
> all servers found that they have a IPv6 router on LAN and started using
> it - automated DHCP IPv6?
>
> I wonder if anyone else also had similar issues? Also, if my guesses
> are correct then how can we disable Red Hat distro oriented servers
> from taking such automated configuration - simple DHCP in IPv6 disable?
>
>
>
>
> Thanks
>
> --
>
> Anurag Bhatia
> anuragbhatia.com
> or simply - http://[2001:470:26:78f::5] if you are on IPv6 connected
> network!
>
> Twitter: @anurag_bhatia <https://twitter.com/#!/anurag_bhatia>
> Linkedin: http://linkedin.anuragbhatia.com
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