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List:       netfilter-devel
Subject:    Re: bridge+netfilter broken for IP fragments in 2.6.16?
From:       Thomas Zeitlhofer <thomas.zeitlhofer () nt ! tuwien ! ac ! at>
Date:       2006-04-02 23:36:53
Message-ID: 20060402233653.GA30271 () swan ! nt ! tuwien ! ac ! at
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On Mon, Apr 03, 2006 at 01:11:46AM +0200, Patrick McHardy wrote:
> Thomas Zeitlhofer wrote:
> > On Sun, Apr 02, 2006 at 09:19:30PM +0200, Patrick McHardy wrote:
> > 
> > > > Doing the same on 2.6.15.x shows:
> > > > 
> > > > 1) on tap1: fragmented packets
> > > > 2) on br0: the defragmented packet (connection tracking)
> > > > 3) on eth1: fragmented packets
> > > 
> > > Are you sure this is correct? I think in 2.6.15 you should see
> > > the fragments on br0 already.
> > 
> > 
> > Just verified it, at least in 2.6.15.6 tcpdump shows the defragmented
> > packet on br0.
> 
> I'm probably missing something, but that still seems stange.
> Are you also seeing the defragmented packet on br0 with my
> patch?

Yes, here is the tcpdump output on all interfaces: 

1) on tap1
23:22:51.830046 IP (tos 0x0, ttl  64, id 21174, offset 0, flags [+], proto: UDP (17), \
length: 1500) 192.168.10.1.500 > 192.168.20.1.500: isakmp 1.0 msgid : phase 1 I \
ident[E]: [encrypted id] (len mismatch: isakmp 2572/ip 1472) 23:22:51.830084 IP (tos \
0x0, ttl  64, id 21174, offset 1480, flags [none], proto: UDP (17), length: 1120) \
192.168.10.1 > 192.168.20.1: udp 

2) on br0
23:22:51.830084 IP (tos 0x0, ttl  64, id 21174, offset 0, flags [none], proto: UDP \
(17), length: 2600) 192.168.10.1.500 > 192.168.20.1.500: isakmp 1.0 msgid : phase 1 I \
ident[E]: [encrypted id]

3) on eth1 
23:22:51.830120 IP (tos 0x0, ttl  64, id 21174, offset 0, flags [+], proto: UDP (17), \
length: 1500) 192.168.10.1.500 > 192.168.20.1.500: isakmp 1.0 msgid : phase 1 I \
ident[E]: [encrypted id] (len mismatch: isakmp 2572/ip 1472) 23:22:51.830133 IP (tos \
0x0, ttl  64, id 21174, offset 1480, flags [none], proto: UDP (17), length: 1120) \
192.168.10.1 > 192.168.20.1: udp

--
Thomas


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