further reply-to strangeness

Mon, 31 Mar 2003 15:09:23 -0800

As I mentioned on the list a few days ago I have been having some trouble with reply-to. In particular it seems to be generating a bad tc checksum for the return packet. Since then I have rebuilt kernel and world to source checked out this morning (3/31) and it seems to properly return route pings, but still fails on the TCP with bad checksums. I have put a more full TCP packet trace from the client machine below in case it sparks something in anyone.

Thank you for any help.

-David Powers

17:53:16.652413 xxx.xxx.xxx.xxx.port > yyy.yyy.yyy.yyy.ssh: S [tcp sum ok] 
1807604332:1807604332(0) win 57344 <mss 1460,nop,wscale 0,nop,nop,timestamp 2018840 0> 
(DF) (ttl 64, id 26021, len 60)
0x0000   4500 003c 65a5 4000 4006 84ab cf63 7353        E..<[EMAIL PROTECTED]@....csS
0x0010   d8e0 34d4 0a2a 0016 6bbd da6c 0000 0000        ..4..*..k..l....
0x0020   a002 e000 fbfa 0000 0204 05b4 0103 0300        ................
0x0030   0101 080a 001e ce18 0000 0000                  ............
17:53:16.677889 yyy.yyy.yyy.yyy.ssh > xxx.xxx.xxx.xxx.port: S [bad tcp cksum 53a0!] 
3475200739:3475200739(0) ack 1807604333 win 17376 <mss 1460,nop,wscale 0,nop,nop,timestamp 
21658571 2018840> (DF) (ttl 58, id 42684, len 60)
0x0000   4500 003c a6bc 4000 3a06 4994 d8e0 34d4        E..<[EMAIL PROTECTED]:.I...4.
0x0010   cf63 7353 0016 0a2a cf23 5ae3 6bbd da6d        .csS...*.#Z.k..m
0x0020   a012 43e0 509a 0000 0204 05b4 0103 0300        ..C.P...........
0x0030   0101 080a 014a 7bcb 001e ce18                  .....J{.....
17:53:19.645037 xxx.xxx.xxx.xxx.port > yyy.yyy.yyy.yyy.ssh: S [tcp sum ok] 
1807604332:1807604332(0) win 57344 <mss 1460,nop,wscale 0,nop,nop,timestamp 2019140 0> 
(DF) (ttl 64, id 57581, len 60)
0x0000   4500 003c e0ed 4000 4006 0963 cf63 7353        E..<[EMAIL PROTECTED]@..c.csS
0x0010   d8e0 34d4 0a2a 0016 6bbd da6c 0000 0000        ..4..*..k..l....
0x0020   a002 e000 face 0000 0204 05b4 0103 0300        ................
0x0030   0101 080a 001e cf44 0000 0000                  .......D....
17:53:19.670317 yyy.yyy.yyy.yyy.ssh > xxx.xxx.xxx.xxx.port: S [bad tcp cksum 219f!] 
3475200739:3475200739(0) ack 1807604333 win 17376 <mss 1460,nop,wscale 0,nop,nop,timestamp 
21658577 2019140> (DF) (ttl 58, id 65290, len 60)
0x0000   4500 003c ff0a 4000 3a06 f145 d8e0 34d4        E..<[EMAIL PROTECTED]:..E..4.
0x0010   cf63 7353 0016 0a2a cf23 5ae3 6bbd da6d        .csS...*.#Z.k..m
0x0020   a012 43e0 509a 0000 0204 05b4 0103 0300        ..C.P...........
0x0030   0101 080a 014a 7bd1 001e cf44                  .....J{....D
17:53:22.845106 xxx.xxx.xxx.xxx.port > yyy.yyy.yyy.yyy.ssh: S [tcp sum ok] 
1807604332:1807604332(0) win 57344 <mss 1460,nop,wscale 0,nop,nop,timestamp 2019460 0> 
(DF) (ttl 64, id 21241, len 60)
0x0000   4500 003c 52f9 4000 4006 9757 cf63 7353        E..<[EMAIL PROTECTED]@..W.csS
0x0010   d8e0 34d4 0a2a 0016 6bbd da6c 0000 0000        ..4..*..k..l....
0x0020   a002 e000 f98e 0000 0204 05b4 0103 0300        ................
0x0030   0101 080a 001e d084 0000 0000                  ............
17:53:23.497186 yyy.yyy.yyy.yyy.ssh > xxx.xxx.xxx.xxx.port: S [bad tcp cksum d99d!] 
3475200739:3475200739(0) ack 1807604333 win 17376 <mss 1460,nop,wscale 0,nop,nop,timestamp 
21658585 2019460> (DF) (ttl 58, id 63080, len 60)
0x0000   4500 003c f668 4000 3a06 f9e7 d8e0 34d4        E..<[EMAIL PROTECTED]:.....4.
0x0010   cf63 7353 0016 0a2a cf23 5ae3 6bbd da6d        .csS...*.#Z.k..m
0x0020   a012 43e0 509a 0000 0204 05b4 0103 0300        ..C.P...........
0x0030   0101 080a 014a 7bd9 001e d084                  .....J{.....
17:53:26.045343 xxx.xxx.xxx.xxx.port > yyy.yyy.yyy.yyy.ssh: S [tcp sum ok] 
1807604332:1807604332(0) win 57344 <mss 1460> (DF) (ttl 64, id 35829, len 44)
0x0000   4500 002c 8bf5 4000 4006 5e6b cf63 7353        E..,[EMAIL PROTECTED]@.^k.csS
0x0010   d8e0 34d4 0a2a 0016 6bbd da6c 0000 0000        ..4..*..k..l....
0x0020   6002 e000 1750 0000 0204 05b4                  `....P......
17:53:26.074621 yyy.yyy.yyy.yyy.ssh > xxx.xxx.xxx.xxx.port: S [bad tcp cksum d49d!] 
3475200739:3475200739(0) ack 1807604333 win 17376 <mss 1460,nop,wscale 0,nop,nop,timestamp 
21658590 2019460> (DF) (ttl 58, id 49424, len 60)
0x0000   4500 003c c110 4000 3a06 2f40 d8e0 34d4        E..<[EMAIL PROTECTED]:./@..4.
0x0010   cf63 7353 0016 0a2a cf23 5ae3 6bbd da6d        .csS...*.#Z.k..m
0x0020   a012 43e0 509a 0000 0204 05b4 0103 0300        ..C.P...........
0x0030   0101 080a 014a 7bde 001e d084                  .....J{.....
17:53:29.245529 xxx.xxx.xxx.xxx.port > yyy.yyy.yyy.yyy.ssh: S [tcp sum ok] 
1807604332:1807604332(0) win 57344 <mss 1460> (DF) (ttl 64, id 12758, len 44)
0x0000   4500 002c 31d6 4000 4006 b88a cf63 7353        E..,[EMAIL PROTECTED]@....csS
0x0010   d8e0 34d4 0a2a 0016 6bbd da6c 0000 0000        ..4..*..k..l....
0x0020   6002 e000 1750 0000 0204 05b4                  `....P......
17:53:29.270544 yyy.yyy.yyy.yyy.ssh > xxx.xxx.xxx.xxx.port: S [bad tcp cksum ce9d!] 
3475200739:3475200739(0) ack 1807604333 win 17376 <mss 1460,nop,wscale 0,nop,nop,timestamp 
21658596 2019460> (DF) (ttl 58, id 48140, len 60)
0x0000   4500 003c bc0c 4000 3a06 3444 d8e0 34d4        E..<[EMAIL PROTECTED]:.4D..4.
0x0010   cf63 7353 0016 0a2a cf23 5ae3 6bbd da6d        .csS...*.#Z.k..m
0x0020   a012 43e0 509a 0000 0204 05b4 0103 0300        ..C.P...........
0x0030   0101 080a 014a 7be4 001e d084                  .....J{.....
17:53:32.445757 xxx.xxx.xxx.xxx.port > yyy.yyy.yyy.yyy.ssh: S [tcp sum ok] 
1807604332:1807604332(0) win 57344 <mss 1460> (DF) (ttl 64, id 17569, len 44)
0x0000   4500 002c 44a1 4000 4006 a5bf cf63 7353        E..,[EMAIL PROTECTED]@....csS
0x0010   d8e0 34d4 0a2a 0016 6bbd da6c 0000 0000        ..4..*..k..l....
0x0020   6002 e000 1750 0000 0204 05b4                  `....P......
17:53:32.470924 yyy.yyy.yyy.yyy.ssh > xxx.xxx.xxx.xxx.port: S [bad tcp cksum c79d!] 
3475200739:3475200739(0) ack 1807604333 win 17376 <mss 1460,nop,wscale 0,nop,nop,timestamp 
21658603 2019460> (DF) (ttl 58, id 63513, len 60)
0x0000   4500 003c f819 4000 3a06 f836 d8e0 34d4        E..<[EMAIL PROTECTED]:..6..4.
0x0010   cf63 7353 0016 0a2a cf23 5ae3 6bbd da6d        .csS...*.#Z.k..m
0x0020   a012 43e0 509a 0000 0204 05b4 0103 0300        ..C.P...........
0x0030   0101 080a 014a 7beb 001e d084                  .....J{.....
17:53:38.466438 yyy.yyy.yyy.yyy.ssh > xxx.xxx.xxx.xxx.port: S [bad tcp cksum bb9d!] 
3475200739:3475200739(0) ack 1807604333 win 17376 <mss 1460,nop,wscale 0,nop,nop,timestamp 
21658615 2019460> (DF) (ttl 58, id 51827, len 60)
0x0000   4500 003c ca73 4000 3a06 25dd d8e0 34d4        E..<[EMAIL PROTECTED]:.%...4.
0x0010   cf63 7353 0016 0a2a cf23 5ae3 6bbd da6d        .csS...*.#Z.k..m
0x0020   a012 43e0 509a 0000 0204 05b4 0103 0300        ..C.P...........
0x0030   0101 080a 014a 7bf7 001e d084                  .....J{.....
17:53:38.646117 xxx.xxx.xxx.xxx.port > yyy.yyy.yyy.yyy.ssh: S [tcp sum ok] 
1807604332:1807604332(0) win 57344 <mss 1460> (DF) (ttl 64, id 58332, len 44)
0x0000   4500 002c e3dc 4000 4006 0684 cf63 7353        E..,[EMAIL PROTECTED]@....csS
0x0010   d8e0 34d4 0a2a 0016 6bbd da6c 0000 0000        ..4..*..k..l....
0x0020   6002 e000 1750 0000 0204 05b4                  `....P......
17:53:38.670929 yyy.yyy.yyy.yyy.ssh > xxx.xxx.xxx.xxx.port: S [bad tcp cksum bb9d!] 
3475200739:3475200739(0) ack 1807604333 win 17376 <mss 1460,nop,wscale 0,nop,nop,timestamp 
21658615 2019460> (DF) (ttl 58, id 44829, len 60)
0x0000   4500 003c af1d 4000 3a06 4133 d8e0 34d4        E..<[EMAIL PROTECTED]:.A3..4.
0x0010   cf63 7353 0016 0a2a cf23 5ae3 6bbd da6d        .csS...*.#Z.k..m
0x0020   a012 43e0 509a 0000 0204 05b4 0103 0300        ..C.P...........
0x0030   0101 080a 014a 7bf7 001e d084                  .....J{.....

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