Date: Mon, 24 Jun 2002 08:38:44 -0700 (PDT) From: Daniel Huang <dhuang@qobra.com> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/39787: T/TCP support Message-ID: <200206241538.g5OFci6O085927@www.freebsd.org>
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>Number: 39787
>Category: misc
>Synopsis: T/TCP support
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon Jun 24 08:40:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Daniel Huang
>Release: FreeBSD 4.5
>Organization:
Qobra Systems Inc.
>Environment:
FreeBSD 4.5-RELEASE FreeBSD 4.5-RELEASE #0: Mon Jan 28 14:31:56 GMT 2002 murray@builder.freebsdmall.com:/usr/src/sys/compile/GENERIC i386
>Description:
I tested the T/TCP by using the source code in <T/TCP Illustrated Volume
3> on FreeBsd 4.5. The tcpdump result as below:
09:49:10.957632 dhcp189.tor.qobra.net.1026 > dhcp189.tor.qobra.net.1028:
SFP 3873691517:3873691817(300) win 65535 <mss 16344,nop,nop,ccnew 7> (DF)
09:49:10.957748 dhcp189.tor.qobra.net.1028 > dhcp189.tor.qobra.net.1026:
S 2495134045:2495134045(0) ack 3873691518 win 65535 <mss 16344, nop, nop, cc 8, nop,nop,ccecho 7>
09:49:10.957782 dhcp189.tor.qobra.net.1026 > dhcp189.tor.qobra.net.1028:
F 301:301(0) ack 1 win 65535 <nop,nop,cc 7> (DF)
09:49:10.957834 dhcp189.tor.qobra.net.1028 > dhcp189.tor.qobra.net.1026:
ack 1 win 65535 <nop,nop,cc 8> (DF)
09:49:11.950539 dhcp189.tor.qobra.net.1026 > dhcp189.tor.qobra.net.1028:
FP 1:301(300) ack 1 win 65535 <nop,nop,cc 7> (DF)
09:49:11.950578 dhcp189.tor.qobra.net.1028 > dhcp189.tor.qobra.net.1026:
ack 302 win 65535 <nop,nop,cc 8> (DF)
09:49:11.950750 dhcp189.tor.qobra.net.1028 > dhcp189.tor.qobra.net.1026:
FP 1:401(400) ack 302 win 65535 <nop,nop,cc 8> (DF)
09:49:11.950768 dhcp189.tor.qobra.net.1026 > dhcp189.tor.qobra.net.1028:
ack 402 win 65535 <nop,nop,cc 7> (DF)
The client sent 300 bytes to server, and server reply 400 bytes to
client. It seems that step 4 and 5 are wrong, but I don't know why. I set rfc1644 on(1) and rfc1323 off(0), why step 4 sends wrong ACK and step 5 resend the message to server.
Furthermore, I couldn't get the normal T/TCP transaction result -- just 3 segments, for my test it's seem with the upper tcpdump. Could you please give me some advice? I appreciate.
>How-To-Repeat:
Simply use the example T/TCP client/server source code in <TCP/IP Illustrated, Volume 3> P.17, P.18
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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