On Thu, Aug 02, 2007 at 09:19:06AM +0300, [EMAIL PROTECTED] ([EMAIL PROTECTED])
wrote:
> 1186035057.207629 127.0.0.1 -> 127.0.0.1 TCP 50000 > smtp [SYN]
> Seq=0 Len=0
> 1186035057.207632 127.0.0.1 -> 127.0.0.1 TCP smtp > 50000 [SYN, ACK]
> Seq=0 Ack=1 Win=32792 Len=0 MSS=16396
> 1186035057.207666 127.0.0.1 -> 127.0.0.1 TCP 50000 > smtp [ACK]
> Seq=1 Ack=1 Win=1500 Len=0
> 1186035057.207699 127.0.0.1 -> 127.0.0.1 SMTP Command: EHLO localhost
> 1186035057.207718 127.0.0.1 -> 127.0.0.1 TCP smtp > 50000 [ACK]
> Seq=1 Ack=17 Win=32792 Len=0
> 1186035057.207736 127.0.0.1 -> 127.0.0.1 TCP 50000 > smtp [RST]
> Seq=17 Len=0
> 1186035057.223934 127.0.0.1 -> 127.0.0.1 TCP 33787 > 50000 [RST,
> ACK] Seq=0 Ack=0 Win=32792 Len=0
>
> Can someone please comment as to why, tcp stack sends rst packet from the
> wrong source port in this situation.
Besides the fact, that test applications do not run if started not as
root, I got this:
13:51:12.180241 IP localhost.localdomain.50000 > localhost.localdomain.10250: S
906222067:906222067(0) win 1500
13:51:12.180279 IP localhost.localdomain.10250 > localhost.localdomain.50000: S
2011233747:2011233747(0) ack 906222068
win 32792 <mss 16396>
13:51:12.180293 IP localhost.localdomain.50000 > localhost.localdomain.10250: R
906222068:906222068(0) win 0
13:51:12.180320 IP localhost.localdomain.50000 > localhost.localdomain.10250: .
ack 1 win 1500
13:51:12.180329 IP localhost.localdomain.10250 > localhost.localdomain.50000: R
2011233748:2011233748(0) win 0
13:51:12.180341 IP localhost.localdomain.50000 > localhost.localdomain.10250: P
1:17(16) ack 1 win 1500
13:51:12.180349 IP localhost.localdomain.10250 > localhost.localdomain.50000: R
2011233748:2011233748(0) win 0
13:51:12.180361 IP localhost.localdomain.50000 > localhost.localdomain.10250: R
906222084:906222084(0) win 1500
I.e. there is no bug in this session.
FC7 2.6.22.1-27.fc7 kernel.
Here is vanilla (with my patches, unrelated to the problem though)
2.6.22-rc5:
09:33:37.650279 IP localhost.50000 > localhost.10250: S
1326688203:1326688203(0) win 1500
09:33:37.664391 IP localhost.10250 > localhost.50000: S
3637551175:3637551175(0) ack 1326688204 win 32792 <mss 16396>
09:33:37.664417 IP localhost.50000 > localhost.10250: R
1326688204:1326688204(0) win 0
09:33:37.650451 IP localhost.50000 > localhost.10250: . ack 1 win 1500
09:33:37.650467 IP localhost.10250 > localhost.50000: R
3637551176:3637551176(0) win 0
09:33:37.650481 IP localhost.50000 > localhost.10250: P 1:17(16) ack 1 win 1500
09:33:37.650493 IP localhost.10250 > localhost.50000: R
3637551176:3637551176(0) win 0
09:33:37.650507 IP localhost.50000 > localhost.10250: R
1326688220:1326688220(0) win 1500
Is it possible that your tcpdump is screwed?
--
Evgeniy Polyakov
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