I have a 43P running AIX 4.2.x, standard on-board ethernet, and a couple of
plug-and-play Netgear switches and hubs. The other hosts on the LAN are a
mixture of linux and Windows NT systems, with the entire LAN behind a Cisco
router. The ethernet adapter is configured to operate in half-duplex mode,
and I am using the en0 interface.
When I connect the 43P directly to a switch port, ping connections to and
from it work correctly. Also, I can telnet from the 43P to another host.
When trying to establish a telnet connection from another host to the 43P,
everything stops after the username and password are entered. Looking at
netstat -a on the 43P I see an established telnet connection, but with
around 1000 packets in the outbound queue. Similar behaviour is exhibited
with other TCP applications, e.g. ftp and http.
When I connect the 43P to a hub* off the same switch everything
functions perfectly. I've tried this with a couple of different hubs, with
Wondering whether the problem could be related to ethernet frame standards,
I tried switching over to et0. Using et0 I am able to ping the Cisco, but
get responses from no other host in the LAN. Pinging hosts on the same hub
was also unsuccessful.
I also tried replacing the cable(!), and tried various combinations of half
and full duplex.
Can anyone suggest what might be causing this problem, or what further tests
I could try?
Dr. Anthony Dyson Ph: +41-61-9272077
Triangle Micro Research AG Fax: +41-61-9220372
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