Re: [PATCH 05/19] netfilter: nf_conntrack_ipv6: improve fragmentation handling
From: Jesper Dangaard Brouer <hidden>
Date: 2012-08-21 22:21:37
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netfilter-devel
On Sun, 2012-08-19 at 21:44 +0200, Patrick McHardy wrote:
On Sun, 19 Aug 2012, Jesper Dangaard Brouer wrote:quoted
On Sat, 2012-08-18 at 14:26 +0200, Patrick McHardy wrote:
[...]
quoted
Don't I need to load some of the helper modules, or just the nf_conntrack_ipv6 module, or perhaps only nf_defrag_ipv6 ?Not with the entire patchset, just IPv6 conntrack is enough. Aith IPv6 NAT the first packet of a connection must always be defragemented, independant of an assigned helper.
When loading "nf_conntrack_ipv6" I run into issues. When sending a fragmented UDP packet. With these patches, the IPVS stack will no longer see the fragmented packets, but instead see one large SKB. This will trigger a MTU path check in e.g. ip_vs_dr_xmit_v6() and an ICMPv6 too big packet is send back. IPVS: ip_vs_dr_xmit_v6(): frag needed Perhaps we could change/fix the MTU check in IPVS? (This would also solve issues I've seen with TSO/GSO frames, hitting this code path). -- Best regards, Jesper Dangaard Brouer MSc.CS, Sr. Network Kernel Developer at Red Hat Author of http://www.iptv-analyzer.org LinkedIn: http://www.linkedin.com/in/brouer