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From Cyril SANTUNE <cyril.sant...@gmail.com>
Subject Weird behavior of FTP sampler
Date Thu, 13 Dec 2012 10:13:38 GMT
Hi,

I make a tcpdump during a test with one FTP sampler (1 thread and 1 loop).

09:54:58.655300 IP 10.68.32.1.45899 > 10.68.40.1.21: Flags [S], seq
1358911309, win 5840, options [mss 1460,sackOK,TS val 162021637 ecr
0,nop,wscale 6], length 0
09:54:58.655654 IP 10.68.40.1.21 > 10.68.32.1.45899: Flags [S.], seq
1742802426, ack 1358911310, win 14480, options [mss 1460,sackOK,TS val
601777784 ecr 162021637,nop,wscale 5], length 0
09:54:58.967226 IP 10.68.32.1.57509 > 10.68.40.1.56079: Flags [S], seq
1364362997, win 5840, options [mss
1460,sackOK,nop,nop,nop,nop,nop,nop,nop,nop,nop,nop,nop,wscale 6],
length 0
09:54:58.967413 IP 10.68.40.1.56079 > 10.68.32.1.57509: Flags [S.],
seq 4056587283, ack 1364362998, win 14600, options [mss
1460,nop,nop,sackOK,nop,wscale 5], length 0
09:54:59.596652 IP 10.68.40.1.56079 > 10.68.32.1.57509: Flags [FP.],
seq 1048281:1048577, ack 1, win 457, length 296
09:55:29.574459 IP 10.68.40.1.21 > 10.68.32.1.45899: Flags [F.], seq
377, ack 64, win 453, options [nop,nop,TS val 601808698 ecr
162022636], length 0
09:55:29.625589 IP 10.68.32.1.45899 > 10.68.40.1.21: Flags [F.], seq
64, ack 378, win 92, options [nop,nop,TS val 162052602 ecr 601808698],
length 0
09:55:29.625634 IP 10.68.32.1.57509 > 10.68.40.1.56079: Flags [F.],
seq 1, ack 1048578, win 9536, length 0


After the ''FIN'' of the data session send by the server, the client
(jmeter sampler) doesn't answer with ''FIN-ACK''. So, after 30 sec the
FTP server close the FTP control session by timeout.

There is bug here ? or some sort of keep-alive for FTP session can
explain this behavior ?


Thanks

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