topic Re: Losing network connection in Operating System - HP-UX

Losing network connection

Miro Klima — Sat, 26 Mar 2005 01:45:03 GMT

# Model: 9000/800/L2000-44
# btlan - HP PCI 10/100Base-TX Core
# 0/0/0/0 0x001083F83B33 0 UP lan0 snap0 1
# ETHER Yes 119
Last week I lost network connection twice.
I can ping myself, nothing else.
First time I replaced network cable. Connection returned. Two days
later the same problem, this time I pulled out network cable and plugged it back. Connection returned. I didn't find any errors at the switch. Any advice?

Re: Losing network connection

harry d brown jr — Sat, 26 Mar 2005 06:58:47 GMT

error messages in syslog?

Next time it happens (if it does) check the link light status on the lan card.

Last major patch set was ?

live free or die
harry d brown jr

Re: Losing network connection

Devender Khatana — Sat, 26 Mar 2005 07:04:10 GMT

Hi,

It appears to be a cable problem only as both the time you handled cable and it started working.

If you have multiple cables from the same switch the best is to try swapping cables between two interfaces.

Here another thing you can check is to look for network statitics using lanadmin command. Lanadmin also works as menu driven utility.

HTH,
Devender

Re: Losing network connection

Miro Klima — Sat, 26 Mar 2005 08:51:00 GMT

No error messages in syslog.log
NIC card lights are O.K.
No errors in lanadmin (attached).

Re: Losing network connection

harry d brown jr — Sat, 26 Mar 2005 09:50:12 GMT

what about patches?

anyone fooling around in the back of the machine?

try a different port in network switch.

check autonegotiation.

live free or die
harry d brown jr

Re: Losing network connection

Miro Klima — Sat, 26 Mar 2005 10:09:40 GMT

I didn't install any patches.
System has Cold install of HPUX11.11 ver.1 June 2004
Nobody is fooling around in the back.
I did try different port in network swich.
I don't use autonegotiation, system is set
to manual 100FD.

Re: Losing network connection

Florian Heigl (new acc) — Sat, 26 Mar 2005 12:32:00 GMT

when it occurs again, play around a bit with lanadmin:

copy away the error logs, reset the card, reset the counters.
check if the card reset re-established the network connection, if not check for any error counters that increase over the next period of time.
change the cable, see if that helps, next the port on the switch, and next the core I/O card :)

Re: Losing network connection

rick jones — Sun, 27 Mar 2005 15:01:39 GMT

If there are any other HP-UX boxes, you might also try linkloop in addition to ping. Linkloop does not rely on IP connectivity.

Make sure nothing else on the network is usurping the IP address of your host.

If your connections are all remote (through a gateway) might want to make sure the ndd variable ip_ire_gateway_probe is zero if your gateway will not respond to ICMP echo requests (aka pings).

Might check the nettl logs with netfmt and see what they say.

Manpages should get you started for lanadmin, linkloop, nettl, netfmt and ndd.

Re: Losing network connection

Miro Klima — Sat, 02 Apr 2005 08:23:09 GMT

I installed patch PHNE_28799, no more network problems.