topic Re: packets lost in Operating System - HP-UX

packets lost

ECC_1 — Sat, 10 May 2003 18:45:17 GMT

I have recently installed hp-ux 11.00 on a class A server and I have configured both lan cards lan0 & lan1 as I did in the other servers I did install them before.
but that server is dropping packets on pinging any neighbour host...so I can't any remote connection with it despite that the two interfaces are up and can ping the local server ips...note the problem started when I installed debian 3.0 on that pa-risc server..I thought it's because of debian but when I reinstalled hp-ux the problem still found..can someone help me plz....thx

Re: packets lost

Michael Tully — Sat, 10 May 2003 20:04:27 GMT

You'll probably find that your lan card is trying to talk in half-duplex mode.

Easy way to check:
# lanadmin -x 0 (this number is the lan card numner)

To Change
# lanadmin -X 100FD 0 (assuming 100baseT full duplex)
Depending on what type of card as to what config file should be updated.

Re: packets lost

A. Clay Stephenson — Sat, 10 May 2003 20:09:45 GMT

Possible problems:

lan0 and lan1 share a common subnet and/or IP address and you are not running APA (Auto-Port Aggregation).

Speed/duplex mismatches between lan cards and their corresponding switch ports.
There is a fundamental problem with the 100Base-T standard in that certain cable lenghts are prone to resonance and the negotiation fails. You should hard set the lan cards and their switch ports and I think your problems will disappear. If you have other boxes that are auto-configured, they are working by accidents and should also be hard set.

Re: packets lost

Sunil Sharma_1 — Mon, 12 May 2003 04:11:21 GMT

These kind of problem generally occure becoz of mismatch of port speed or it is in auto negotiate mode and it's not able to hand shake properly with switch best option is make switch and lan interface on server both 100Mbps/full duplex and try.

It should work

Sunil