problems interacting on TCP level with K5JB

[David DeSimone]

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Oliver Lehmann <oliver at FreeBSD.org> wrote:
>
> 19:22:31.003359 IP (tos 0x10, ttl 64, id 730, offset 0, flags [DF], proto TCP (6), length 60) 10.1.1.1.54398 > 10.1.1.2.telnet: S, cksum 0xceef (correct), 1217851052:1217851052(0) win 65535 <mss 512,nop,wscale 3,sackOK,timestamp 34167010 0>
> 
> 19:22:31.301210 IP (tos 0x0, ttl 254, id 25, offset 0, flags [none], proto TCP (6), length 44) 10.1.1.2.telnet > 10.1.1.1.54398: S, cksum 0xe752 (correct), 2405380816:2405380816(0) ack 4294967213 win 2048 <mss 512>
> 
> 19:22:31.301234 IP (tos 0x0, ttl 64, id 747, offset 0, flags [DF], proto TCP (6), length 40) 10.1.1.1.54398 > 10.1.1.2.telnet: R, cksum 0xc598 (correct), 4294967213:4294967213(0) win 0

The SYN-ACK packet in response contains an ACK for sequence 4294967213,
but that was not the sequence sent by the initial SYN (it was 1217851052).

The RST shows that FreeBSD doesn't know what your system is talking about.

- -- 
David DeSimone == Network Admin == fox at verio.net
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