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SubjectRe: TCP stalls in 2.0.33 and 2.1.x
   Date: Wed, 18 Mar 1998 23:39:43 +1100
From: Richard Gooch <rgooch@atnf.CSIRO.AU>

OK. I've done as you suggest, with 2.1.90 for machine B. Log
appended. Machine A is running 2.1.86 and the LAN ftp server is
running SunOS.

Once again, no data was transferred:

23:35:31.020079 > jubemgee.atnf.CSIRO.AU.1027: S 504256000:504256000(0) win 4096 <mss 1460>

SunOS ftp server opens connection with Linux jubemgee (is this Linux
machine A or B???)

23:35:31.020170 jubemgee.atnf.CSIRO.AU.1027 > S 2378695617:2378695617(0) ack 504256001 win 32120 <mss 1460> (DF)

Linux ftp client response.

23:35:31.150088 > jubemgee.atnf.CSIRO.AU.1027: . ack 1 win 4096

SunOS ftp server completes the connection.

23:36:35.500772 jubemgee.atnf.CSIRO.AU.1027 > F 1:1(0) ack 1 win 32120 (DF) [tos 0x8]
23:36:38.499838 jubemgee.atnf.CSIRO.AU.1027 > F 1:1(0) ack 1 win 32120 (DF) [tos 0x8]

Linux ftp client closes the connection, this is the only way a FIN
would be generated. Either your FTP client closed the connection, or
it core dumped or exited for some other reason.

23:36:38.611064 > jubemgee.atnf.CSIRO.AU.1027: . ack 2 win 4096

SunOS FTP server happily acks the FIN.

23:36:38.611170 jubemgee.atnf.CSIRO.AU.1027 > R 2378695619:2378695619(0) win 0

Linux machine sends a RST back, this is a bug, and I know when I fixed
this bug, so this Linux machine must be machine A and thus running
2.1.86. Therefore you did not do as I suggested.

David S. Miller

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