Network Problem on HP-UX

[Robert DJ]

Hi,

I have strange problem in my HP-Ux box running 11.x. The Network connection on the Hp-Ux box gets disconnected every 15 minutes and network resumes after 5 or 10 minutes.

Please let me know if there is a way to resolve this issue.

Thanx & Regards,

Robert

[steven Burgess_2]

Hi

Try this and see if you can match an outage with an event in the file

netfmt -t 30 /var/adm/nettl.LOG00 > /tmp/netfmt.out

Anything in your syslog, dmesg etc

Any network events outside the server on the LAN/WAN

HTH

Steve

[Stefan Farrelly]

with that sort of regulariy it sounds like a speed mismatch. What is the speed of your HP lancard set to, eg. 100FD, 100HD, 1000FD, AUTO ?

It needs to be set to the same speed on the switch its plugged in to. If they are not set the same then periodically they will autonegotiate, which drops the network, then when they have negotiated a new speed the network comes up again. You can prove it as there will be messages about this in /var/adm/syslog/syslog.log

[T G Manikandan]

Just do a lanadmin and check for the packet errors/collisions.

If so make sure that the duplex and speed at both server and switch ends are set to the same value.

[rick jones]

Is it _all_ network connections, even those on the local subnet, or just remote network connections (those going through a gateway?)

If _all_ network connections, then yes, you might check the link-level statistics with lanadmin -g mibstats. If the interface description says full-duplex and you see FCS errors, or if it says half-duplex and you see _late_ collisions, then you _might_ have a duplex mismatch. Make sure that _both_ ends of the cable are set to the same - either both auto, both hd or both fd.

If just through a gateway are lost, you might see if it has some sort of ICMP rate limition going-on - by default HP-UX 11.X prefers that routers respond to ICMP echo requests.

You might compare the peroidicity of th etimeouts with the following ndd settings:

ip_ire_gw_probe_interval
ip_ire_flush_interval
ip_ire_cleanup_interval
arp_cleanup_interval

[Steven E. Protter · Accepted solution]

Random problems like this could indicate a problem handing out duplciate IP addresses. Could this server have the same IP address as another system?

That would be one possible cause of this issue.

SEP

[Robert DJ]

Hi All,

The problem got resolved after i gave another IP to the Workstation. Since the IP was conflicting with the same IP.

Thank you all for your support.

Thanx & Regards,

Robert

[T G Manikandan]

you are assigning points to your own login with a different ID!!

[Robert DJ]

Hi Mani,

Sorry I didn't notice....

Thanx & Regards,

Robert