ISC 2.2.1 TCP/IP problems

[colin manning]

I'm having some problems with TCP/IP on ISC 2.2.1 on 
a 486/33 EISA box with a WD8003E card.

Problem is general unreliability, such as FTP sessions
which report 'bind error 113' whenever an attempt is made
to do something which involves opening a data connection,
and rlogin sessions to the ISC box which work first time, 
and then fail on successive occasions. 

It has been noted that doing simple tests with ping often
results in many missed ping sequence numbers. E.g getting
the machine to ping itself often produces ping sequences
with very regular missed packets (e.g 0,1,3,4,6,7,9,10,12,13, ... 
or 2,5,8,11,14,...). Other times ping'ing itself seems to
work, and then you miss a large number of consecutive pings.

Pinging other machines from the ISC box produces similar results.
Pinging localhost works correctly however.

Pinging the ISC box from other machines running, say, PC/TCP,
does however seem to work fine.

What is most interesting is that the other machines often
report received packets with protocol errors, invalid IP
version number field, checksum errors etc. This is reported
by other machines running various TCP's such as SCO Unix and
PC/TCP 2.05.

The hardware is known to be not at fault as it works fine with
SCO Unix TCP, PC/TCP 2.05 and the WD diagnostics. Only when
running ISC do the problems seem to occur.

Any ideas gratefully received!
-- 
- Colin Manning, cm%jet.uucp at ukc.ac.uk (world) OR cm at jet.uucp (UK only)
- Disclaimer: Please note that the above is a personal view and should not 
  be construed as an official comment from the JET project.