IPv6 gateway, was: Re: IPv6 foot-dragging

Erik Muller erikm at buh.org
Wed May 18 02:30:33 UTC 2011

On Mon, 16 May 2011, Todd Lyons wrote:
> Double check the kernel version you have.  IIRC kernels before 2.6.20
> didn't have the ability to do RELATED,ESTABLISHED in ipv6.  This hit
> me on a CentOS box that I was using as a gateway.  I am unaware if
> there is a version of their 2.6.18 that has the patches backported
> (googling seemed to indicate it has not been done, and most are just
> waiting for new release of CentOS 6).  RH6 works properly.

>From my experience, kernels older than 2.6.27 or so are simply to be 
avoided for anything v6 - in addition to no iptables state pre20, there 
were some RA processing bugs that would result in great fun if, for 
example, your upstream MTU ever changed.  Finding usable backports on 
CentOS was an exercise in futility.


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