Messages in this thread | | | From | Giuliano Procida <> | Subject | RE: TCP wierdness (2.2.3) | Date | Wed, 31 Mar 1999 11:38:00 +0100 |
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OK. I am now on 2.2.4 plus the posted FIN|ACK patch posted here. Instead of a fairly indefinite ping-pong at CLOSE I get the following behaviour:
There seems to be bugs in both Linux and the remote stack.
11:09:00.838303 196.168.5.51.1030 > 196.168.5.50.telnet: S 711963933:711963933(0) win 32120 <mss 1460,sackOK,timestamp 7507580 0,nop,wscale 0> (DF) 11:09:00.852001 196.168.5.50.telnet > 196.168.5.51.1030: S 135:135(0) ack 711963934 win 512 11:09:00.852757 196.168.5.51.1030 > 196.168.5.50.telnet: . ack 1 win 32120 (DF) [snip] 11:09:02.472001 196.168.5.50.telnet > 196.168.5.51.1030: P 140:141(1) ack 56 win 512 11:09:02.492042 196.168.5.51.1030 > 196.168.5.50.telnet: . ack 141 win 32120 (DF) 11:09:02.633148 196.168.5.51.1030 > 196.168.5.50.telnet: P 56:58(2) ack 141 win 32120 (DF) 11:09:02.642001 196.168.5.50.telnet > 196.168.5.51.1030: . ack 58 win 512 # remote telnetd CLOSES, stack sends FIN 11:09:02.762001 196.168.5.50.telnet > 196.168.5.51.1030: F 141:141(0) ack 58 win 512 # linux stack ACKs the FIN 11:09:02.764349 196.168.5.51.1030 > 196.168.5.50.telnet: . ack 142 win 32120 (DF) # local client CLOSES, linux sends FIN 11:09:02.765450 196.168.5.51.1030 > 196.168.5.50.telnet: F 58:58(0) ack 142 win 32120 (DF) # remote stack _fails_ to ACK the FIN (probable bug here!), linux should retransmit 11:09:02.832001 196.168.5.50.telnet > 196.168.5.51.1030: . ack 58 win 512 # linux stack _fails_ to resend FIN (bug??) 11:09:02.834915 196.168.5.51.1030 > 196.168.5.50.telnet: . ack 142 win 32120 (DF) # remote ditto 11:09:02.862001 196.168.5.50.telnet > 196.168.5.51.1030: . ack 58 win 512 # linux ditto 11:09:02.864636 196.168.5.51.1030 > 196.168.5.50.telnet: . ack 142 win 32120 (DF) # remote stack resends FIN 11:09:02.882001 196.168.5.50.telnet > 196.168.5.51.1030: F 141:141(0) ack 59 win 512 # and gets around to ACKing linux's FIN 11:09:02.912001 196.168.5.50.telnet > 196.168.5.51.1030: . ack 59 win 512 # linux does not like this and RSTs 11:09:02.916513 196.168.5.51.1030 > 196.168.5.50.telnet: R 711963992:711963992(0) win 0 11:09:02.942001 196.168.5.50.telnet > 196.168.5.51.1030: . ack 59 win 512 11:09:02.943217 196.168.5.51.1030 > 196.168.5.50.telnet: R 711963992:711963992(0) win 0
Giuliano.
ps am reading Tannebaum here for some illumination...
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