[Xen-bugs] [Bug 495] Port-forwarding in Dom0 causes corrupt TCP checksums in DomU

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=495


rich@xxxxxxxxxxx changed:

           What    |Removed                     |Added
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                 CC|                            |rich@xxxxxxxxxxx




------- Additional Comments From rich@xxxxxxxxxxx  2006-02-08 15:13 -------
I have this bug too, with a Xen unstable nightly tarball downloaded on 
2006/02/02.

Here is a tcpdump of a simple TCP connection made from a domU.  Note that the
initial 3 way handshake goes OK, but thereafter all TCP packets have a bad 
checksum.

tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
15:18:47.955933 IP (tos 0x10, ttl  63, id 55208, offset 0, flags [DF], length:
60) 192.168.2.250.4361 > 80.68.91.176.80: S [tcp sum ok] 87812993:87812993(0)
win 5840 <mss 1460,sackOK,timestamp 146473 0,nop,wscale 2>
15:18:47.989850 IP (tos 0x0, ttl  55, id 0, offset 0, flags [DF], length: 60)
80.68.91.176.80 > 192.168.2.250.4361: S [tcp sum ok] 2338351:2338351(0) ack
87812994 win 5792 <mss 1460,sackOK,timestamp 164554683 146473,nop,wscale 0>
15:18:47.990004 IP (tos 0x10, ttl  63, id 55209, offset 0, flags [DF], length:
52) 192.168.2.250.4361 > 80.68.91.176.80: . [tcp sum ok] 1:1(0) ack 1 win 1460
<nop,nop,timestamp 146482 164554683>
15:18:51.900292 IP (tos 0x10, ttl  63, id 55210, offset 0, flags [DF], length:
68) 192.168.2.250.4361 > 80.68.91.176.80: P [bad tcp cksum fe8b (->4dca)!]
1:17(16) ack 1 win 1460 <nop,nop,timestamp 147460 164554683>
15:18:52.134882 IP (tos 0x10, ttl  63, id 55211, offset 0, flags [DF], length:
68) 192.168.2.250.4361 > 80.68.91.176.80: P [bad tcp cksum fe8b (->4d8f)!]
1:17(16) ack 1 win 1460 <nop,nop,timestamp 147519 164554683>
15:18:52.606902 IP (tos 0x10, ttl  63, id 55212, offset 0, flags [DF], length:
68) 192.168.2.250.4361 > 80.68.91.176.80: P [bad tcp cksum fe8b (->4d19)!]
1:17(16) ack 1 win 1460 <nop,nop,timestamp 147637 164554683>
15:18:53.550959 IP (tos 0x10, ttl  63, id 55213, offset 0, flags [DF], length:
68) 192.168.2.250.4361 > 80.68.91.176.80: P [bad tcp cksum fe8b (->4c2d)!]
1:17(16) ack 1 win 1460 <nop,nop,timestamp 147873 164554683>
15:18:55.567116 IP (tos 0x10, ttl  63, id 55214, offset 0, flags [DF], length:
68) 192.168.2.250.4361 > 80.68.91.176.80: P [bad tcp cksum fe8b (->4a35)!]
1:17(16) ack 1 win 1460 <nop,nop,timestamp 148377 164554683>
15:18:59.583385 IP (tos 0x10, ttl  63, id 55215, offset 0, flags [DF], length:
68) 192.168.2.250.4361 > 80.68.91.176.80: P [bad tcp cksum fe8b (->4649)!]
1:17(16) ack 1 win 1460 <nop,nop,timestamp 149381 164554683>
15:19:07.135834 IP (tos 0x10, ttl  63, id 55216, offset 0, flags [DF], length:
68) 192.168.2.250.4361 > 80.68.91.176.80: P [bad tcp cksum fe8b (->3ee9)!]
1:17(16) ack 1 win 1460 <nop,nop,timestamp 151269 164554683>
15:19:22.240792 IP (tos 0x10, ttl  63, id 55217, offset 0, flags [DF], length:
68) 192.168.2.250.4361 > 80.68.91.176.80: P [bad tcp cksum fe8b (->3029)!]
1:17(16) ack 1 win 1460 <nop,nop,timestamp 155045 164554683>

I am using the standard NAT scripts.

Rich (rich at annexia dot org)

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