[4055] in linux-net channel archive
repeat of previous querry
daemon@ATHENA.MIT.EDU (Paul Levin)
Fri Aug 16 16:07:50 1996
To: linux-net@vger.rutgers.edu
cc: pdlevin@cs.cmu.edu
Date: Fri, 16 Aug 1996 10:50:07 -0400
From: Paul Levin <Paul_Levin@postbox.ius.cs.cmu.edu>
Howdy...
[My mail server seems to have problems. This is a repeat of
my previous query from this morning. Please forgive the
repetition]
I'm having trouble getting my two linux boxes (LB1 and LB2) to
talk to each other. Suggestions are most appreciated.
Configuration:
LB1--pentium triton chipset, linux 1.3.85, slackware network
software, 3com 3c590 combo, pci card.
LB2--passive backplane configuration pentium neptune chipset,
linux 1.3.86 RZ1000 bug-fix installed, same network
software and ethernet card.
I've found the following conditions:
With both machines attatched to my work network, I find...
1) LB1 and LB2 can ping each other and stray unix boxes (UB)
on the network.
2) LB1 and LB2 can telnet into each other and into UB;
3) LB1 and LB2 can ftp into UB (timing statistics pretty much
the same as those of one UB into another);
4) LB1 can ftp into LB2 but the transfer is about 20-50 times
slower than into a UB;
5) LB2 begins ftp into LB1 but then stops after ca 2Kb are sent.
When I isolate the machines onto their own network, I find
6) LB1 and LB2 hang when trying to telnet into each other (including
using the IP address and not just the name).
I add that LB2 tends to spit out the following messages:
Socket destroy delayed, r=0 w != 0
UDP: bad checksum
This suggests to me that LB1 is sending a lot of bad
packets that somehow are being somewhat righted by routers
on my work network, but not efficiently (slow ftp to LB2) and
that some type of ack packet from LB1 to LB2 is so munged that
it isn't recognized by LB2 when it tries to ftp into LB1.
I'ld like to try tcpdump to check out the packets, but I have yet
to get a version to compile successfully on my machines
(I've just switched to gcc 2.7.2, so I might be missing something
here); I always seem to get problems with my /usr/include/net
and /usr/include/inet files and I've seen a number of (different?)
versions included with different network tar.gz files. Suggestions
on this?
Thank y'all very much for all the help.
Best regards
PDLevin The Robotics Institute, CMU
