Loose routing information

[Leon van Ofwegen_1]

Hello,

I have an N4000 machine with hpux 11.11.

Sometimes the machine looses it's connection. Then I can only reach it from the same subnet. From the machine itself I cannnot ping the gateway anymore. I read something about the dead gateway detection, and that is switched off:

n4khp01:/#ndd -get /dev/ip ip_ire_gw_probe
0

What else can it be?

Regards,

Leon

[Ian Dennison_1]

Can you still see the route in the 'netstat -r' command?

Possible causes - bad port on network switch, duplicate IP Addresses, auto-negotiation problem.

Share and Enjoy! Ian

[Leon van Ofwegen_1]

Yes, I still see the default route in the routing table. But I don't think it's a hardware issue. Because I can still ping the server from another server in the same subnet.

Regards,

Leon

[U.SivaKumar_2]

Hi,

When you cannot ping the gateway from HP-UX server that time can you ping the same gateway from any other hosts ?

regards,
U.SivaKumar

[Leon van Ofwegen_1]

Yes, the gateway itself is still up and running, it's just the hpux box, which is not been able to ping it anymore.

Regards,

Leon

[U.SivaKumar_2]

Hi,

Have you tried swapping the hp-ux server's network cable to another switch port at that time ?.

Does the hp-ux server resolve the MAC address of gateway ?
#ping
#arp -a

Also try this in hp-ux when the problem comes and give the results.

#arp -d xxx.xxx.xxx.xxx

where xxx.xxx.xxx.xxx is the ip address of the gateway

Can you ping the gateway now ?

Is this problem intermittent or contimous ?

regards,

U.SivaKumar

[Leon van Ofwegen_1]

I will try this. But I have to wait until the problems happens again.

Regards,

Leon