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From
SubjectRe: Hung RST connection on 2.2.13
Date
Hello!

: 11:28:41.458319 10.61.2.4.2823 > 10.61.2.20.23: S 998971063:998971063(0) win 32120 <mss 1460,sackOK,timestamp 92454381 0,nop,wscale 0> (DF) [tos 0x10] (ttl 64, id 59900)
: 4510 003c e9fc 4000 4006 381e 0a3d 0204
: 0a3d 0214 0b07 0017 3b8b 16b7 0000 0000
: a002 7d78 912d 0000 0204 05b4 0402 080a
: 0582 bded 0000 0000 0103 0300
: 11:28:41.460838 10.61.2.20.23 > 10.61.2.4.2823: R 0:16(16) ack 998971063 win 0 (ttl 64, id 12044)
: 4500 0038 2f0c 0000 4006 3323 0a3d 0214
: 0a3d 0204 0017 0b07 0000 0000 3b8b 16b7
: 5014 0000 1a77 0008 706f 7274 2075 6e61
: 7661 696c 6162 6c65

RFC793:

If the state is SYN-SENT then

first check the ACK bit

If the ACK bit is set

If SEG.ACK =< ISS, or SEG.ACK > SND.NXT, send a reset (unless
the RST bit is set, if so drop the segment and return)


Printer sends invalid RST (should be
10.61.2.20.23 > 10.61.2.4.2823: R 0:16(16) ack 998971064 win 0 (ttl 64, id 12044),)
and we are right dropping it.

Alexey Kuznetsov

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