Subject: Re: [PATCH] ipv6: Use 1280 as min MTU for ipv6 forwarding

From: David Miller <[email-masked]>
Date: Fri, 26 Feb 2010 03:59:47 -0800 (PST)

From: Ulrich Weber <[email-masked]>
Date: Fri, 26 Feb 2010 10:27:52 +0100

> Clients will set their MTU to 1280 if they receive a
> ICMPV6_PKT_TOOBIG message with an MTU less than 1280.
> 
> To allow encapsulating of packets over a 1280 link
> we should always accept packets with a size of 1280
> for forwarding even if the path has a lower MTU and
> fragment the encapsulated packets afterwards.
> 
> In case a forwarded packet is not going to be encapsulated
> a ICMPV6_PKT_TOOBIG msg will still be send by ip6_fragment()
> with the correct MTU.
> 
> Signed-off-by: Ulrich Weber <[email-masked]>

Patch does not apply to net-next-2.6, icmpv6_send() no longer
takes the final 'dev' argument.