Date: Thu, 30 Apr 1998 12:26:33 -0400 (EDT) From: Snob Art Genre <benedict@echonyc.com> To: questions@FreeBSD.ORG Subject: mysterious network problem Message-ID: <Pine.GSO.3.96.980430120846.7734A-100000@echonyc.com>
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Hi there,
I am trying to communicate between two machines, float.port.net and
ben.tapehouse.net. Both are running FreeBSD-stable as of no earlier
than a day or two ago.
Float is up via PPP, ben is connected to a T1.
Float is running ftpd, telnetd and sshd. I am able to ping it and
traceroute to it with no problems. However, when I try to telnet or ssh
to it, the following happens:
1 ben.1042 > float.telnet: S 362040755:362040755(0) win 16384 <mss
1460,nop,wscale 0,nop,nop,timestamp[|tcp]> (DF) [tos 0x10]
2 float.telnet > ben.1042: S 1304627245:1304627245(0) ack 362040756 win
17280 <mss 1460,nop,wscale 0,nop,nop,timestamp[|tcp]> (DF)
3 ben.1042 > float.telnet: . ack 1 win 17280 <nop,nop,timestamp 3773
13627,nop,nop,[|tcp]> (DF) [tos 0x10]
4 ben.1042 > float.telnet: P 1:28(27) ack 1 win 17280 <nop,nop,timestamp
3773 13627,nop,nop,eol,[|tcp]> (DF) [tos 0x10]
5 ben.1042 > float.telnet: P 1:28(27) ack 1 win 17280 <nop,nop,timestamp
3775 13627,nop,nop,eol,[|tcp]> (DF) [tos 0x10]
6 ben.1042 > float.telnet: P 1:28(27) ack 1 win 17280 <nop,nop,timestamp
3781 13627,nop,nop,eol,[|tcp]> (DF) [tos 0x10]
7 ben.1042 > float.telnet: P 1:28(27) ack 1 win 17280 <nop,nop,timestamp
3793 13627,nop,nop,eol,[|tcp]> (DF) [tos 0x10]
As far as I understand this:
1-3: connection setup
4-7: ben is trying to do option negotiation or something. Either
float's TCP isn't seeing these packets, or it isn't acknowledging
them, or the acknowledgements are getting lost somewhere in
between.
The telnet session gets this far and no further:
ben% telnet float
Trying 204.180.205.197...
Connected to float.
Escape character is '^]'.
A tech support person from float's ISP reports being able to get a login
prompt out of float.
I consider myself fairly network-savvy, but could somebody please make a
suggestion as to what the bloody hell is going on? Ben is still trying
to send those same 27 bytes, and I'm out of ideas.
Ben
"You have your mind on computers, it seems."
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