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Date: Fri, 28 Aug 2009 23:54:04 -0700 (PDT) From: David Miller <davem@...emloft.net> To: contact@...chahlusiak.de Cc: netdev@...r.kernel.org Subject: Re: [PATCH] sit: allow ip fragmentation when using nopmtudisc to fix package loss From: Sascha Hlusiak <contact@...chahlusiak.de> Date: Tue, 25 Aug 2009 12:48:42 +0200 > if tunnel parameters have frag_off set to IP_DF, pmtudisc on the ipv4 link > will be performed by deriving the mtu from the ipv4 link and setting the > DF-Flag of the encapsulating IPv4 Header. If fragmentation is needed on the > way, the IPv4 pmtu gets adjusted, the ipv6 package will be resent eventually, > using the new and lower mtu and everyone is happy. > > If the frag_off parameter is unset, the mtu for the tunnel will be derived > from the tunnel device or the ipv6 pmtu, which might be higher than the ipv4 > pmtu. In that case we must allow the fragmentation of the IPv4 packet because > the IPv6 mtu wouldn't 'learn' from the adjusted IPv4 pmtu, resulting in > frequent icmp_frag_needed and package loss on the IPv6 layer. > > This patch allows fragmentation when tunnel was created with parameter > nopmtudisc, like in ipip/gre tunnels. > > Signed-off-by: Sascha Hlusiak <contact@...chahlusiak.de> Seems reasonable, applied to net-next-2.6, thanks! -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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