[Unbound-users] RHEL 5 and Unbound

Hayward, Bruce Bruce.Hayward at mtsallstream.com
Tue Oct 26 12:18:36 UTC 2010


Iptables(6) is not an issue. Thanks  8o)


Bruce Hayward, MTS Allstream Inc., (p) 204-958-1983 (e)
bruce.hayward at mtsallstream.com 

-----Original Message-----
From: Roland van Rijswijk [mailto:Roland.vanRijswijk at surfnet.nl] 
Sent: October 26, 2010 1:44 AM
To: Hayward, Bruce
Cc: unbound-users at unbound.net
Subject: Re: [Unbound-users] RHEL 5 and Unbound


RHEL 5 + IPv6 = evil

Bruce, could it be that you have ip6tables turned on? The IPv6 and
ip6tables implementations in the kernel shipped with RHEL 5 are riddled
with bugs. One of these bugs is that if you enable ip6tables, even
without any firewall rules, the MTU size drops dramatically and the
kernel mucks up IPv6 fragmentation.

I've written down some of the problems we ran into on our resolvers
(running unbound on both IPv4 as well as IPv6) in this blogpost (it also
contains some info on compiling a newer BIND on RHEL 5.x, but you can
ignore that):



-- Roland M. van Rijswijk
-- SURFnet Middleware Services
-- t: +31-30-2305388
-- e: roland.vanrijswijk at surfnet.nl

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