loopback and TCP retransmit timer

Andrea Arcangeli (arcangeli@mbox.queen.it)
Sat, 2 May 1998 17:01:36 +0200 (CEST)

All data that flow through loopback seems duplicated. It seems that the
retransmit timer doesn' t wait for the timeout.

If I run:

andrea@dragon:~$ echo -n | toport dragon 0
connect: Connection refused

I get:

root@dragon:/home/andrea# tcpdump -i lo
tcpdump: listening on lo
16:59:29.225232 dragon.bogus.1097 > dragon.bogus.0: S 3471637767:3471637767(0) win 14128 <mss 3544,sackOK,timestamp 383609 0,nop,wscale 0> (DF)
16:59:29.225232 dragon.bogus.1097 > dragon.bogus.0: S 3471637767:3471637767(0) win 14128 <mss 3544,sackOK,timestamp 383609 0,nop,wscale 0> (DF)
16:59:29.225311 dragon.bogus.0 > dragon.bogus.1097: R 0:0(0) ack 3471637768 win 0
16:59:29.225311 dragon.bogus.0 > dragon.bogus.1097: R 0:0(0) ack 1 win 0

This is true for all 2.x.x. Probably I am missing something but I' d like
to know what ;-).

Andrea[s] Arcangeli

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