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Date: Wed, 2 Jul 1997 19:55:02 GMT
From: Meir Dukhan <mdukhan@bis.co.il>
Message-Id: <199707021955.TAA00505@quasi.bis.co.il>
To: freebsd-hackers@freebsd.org
Subject: Help with a tcpdump output
Cc: mdukhan@bis.co.il
Sender: owner-hackers@freebsd.org
X-Loop: FreeBSD.org
Precedence: bulk

Hi, 

We encounter some trouble while trying to print from an IBM Mainframe to a 
printer connected to a Freebsd 2.1.5 system. 

Here the tcpdump of the tentative, which failed with a EPIPE (Broken pipe)
error message in the Mainframe log file. Could someone explain why 4 SYN 
packet (when I was expecting only 2: SYN and SYN/ACK), and why so many RST ?
Also, when viewing the data with tcpshow one packet contain "lpd: malformed from
address", maybe it can help.

12:30:08.472197 mainframe.1136 > freebsd-215.printer: S 3428224:3428224(0) win 8192 <mss 536>
12:30:08.472197 freebsd-215.printer > mainframe.1136: S 586300417:586300417(0) ack 3428225 win 16616 <mss 1460> (DF)
12:30:11.472197 mainframe.1136 > freebsd-215.printer: S 3428224:3428224(0) win 8192 <mss 536>
12:30:11.472197 freebsd-215.printer > mainframe.1136: . ack 1 win 16616 (DF)
12:30:14.192197 freebsd-215.printer > mainframe.1136: S 586300417:586300417(0) ack 3428225 win 16616 <mss 1460> (DF)
12:30:14.232197 mainframe.1136 > freebsd-215.printer: . ack 1 win 8192
12:30:14.242197 mainframe.1136 > freebsd-215.printer: P 1:83(82) ack 1 win 8192
12:30:14.292197 freebsd-215.printer > mainframe.1136: P 1:29(28) ack 83 win 16534 (DF)
12:30:14.292197 freebsd-215.printer > mainframe.1136: F 29:29(0) ack 83 win 16616 (DF)
12:30:14.372197 mainframe.1136 > freebsd-215.printer: . 83:619(536) ack 1 win 8192
12:30:14.372197 freebsd-215.printer > mainframe.1136: R 586300418:586300418(0) win 0
12:30:14.412197 mainframe.1136 > freebsd-215.printer: . 619:1155(536) ack 1 win 8192
12:30:14.412197 freebsd-215.printer > mainframe.1136: R 586300418:586300418(0) win 16384
12:30:14.412197 mainframe.1136 > freebsd-215.printer: . ack 29 win 8164
12:30:14.412197 freebsd-215.printer > mainframe.1136: R 586300446:586300446(0) win 16384
12:30:14.412197 mainframe.1136 > freebsd-215.printer: . ack 30 win 8163
12:30:14.412197 freebsd-215.printer > mainframe.1136: R 586300447:586300447(0) win 16384
12:30:14.422197 mainframe.1136 > freebsd-215.printer: R 3429379:3429379(0) win 0


Thanks in advance,

-- Meir
ps: please cc to mdukhan@bis.co.il, as I am not on this list, thanks.