topic Re: network problem in Operating System - HP-UX

network problem

Fadia Almarei — Wed, 22 Sep 2004 03:40:30 GMT

Dear All
i have a problem in my HP unix workstaion, that it was working good that i connect to it through my pc after few minutes it is unreachable , i go to it and test it but the network not working ,we check the network nothing is rong , then i try to remove the network cable and return it again the system is stock nothing work , i try to restart it manually and then afer it starts every thing is ok the network is up ,i have two network cards on the system one is used but also i have an application running on the system this application depend on the ip adress , so what do you think the problem is?!
BR,
Fadia

Re: network problem

Shaikh Imran — Wed, 22 Sep 2004 03:46:50 GMT

hi,

Do you mean to say the othe network card
is not used at all ?
if this is the case i would enable that card
and give the same ip & disable the existing
and observe what happens.
easiest & simplest way to dot this is from sam on the console.
Pls revert back

Regards,

Re: network problem

Fadia Almarei — Wed, 22 Sep 2004 04:13:31 GMT

thanks for answering ,
but i'm really afraid of making this step that the application depend mainly on the ip any changing on it may cause the application not to work , how can i check that the interface work good without any problem on it

Re: network problem

Shaikh Imran — Wed, 22 Sep 2004 04:18:19 GMT

Hi,

Anyways you are facing the problem & restarting the server.
Application will not have any problems because you will be giving the same IP
but to a different card which is
not-transparent to the application.

First remember to disable the exist card from sam
Your dowtime will just be the time you take to disable the existing card & enable & assign the same IP to the other card.

Regards,

Re: network problem

Fadia Almarei — Wed, 22 Sep 2004 06:32:49 GMT

ok but im not sure that the problem from the network card itself

Re: network problem

John Palmer — Wed, 22 Sep 2004 06:38:52 GMT

This could possibly be Dead Gateway detection, where HP-UX disables a route if it's unable to ping the router.

Try searching the forums.

Regards,
John

Re: network problem

Shaikh Imran — Wed, 22 Sep 2004 06:39:20 GMT

Hi,

You can confirm by doing this.

The possible causes of your problem:
1) Lan cable ( Swap & keep under observation)
If this is fine then :
2) Network (Do as directed above & observe)
3) Switch settings from which you are taking
the network connections..( networking will help you giving this ==> Comapre it with your settings on the card ==> these setting are speed & duplex settings mainly)

Regards.

Re: network problem

Ron Kinner — Wed, 22 Sep 2004 16:38:42 GMT

As John said: Dead Gateway Detection

This feature is on by default in 11.0. After three minutes without receiving a ping reply from the gateway the gateway will be declared dead and it won't use it any more. Of course this does not apply if your problem is connecting to another PC on the same subnet. In that case look for a duplex mismatch which is causing so many errors that the switch kills the port.

Either ensure that the gateway responds to pings from the HPUX or use ndd to turn off the dead gateway detection.

ndd -set /dev/ip ip_ire_gw_probe 0

then remove the default gateway and reinstall it using route (once you turn off the dead gateway detection it does not automatically reactivate them).

Might be easier to
edit /etc/rc.config.d/nddconf to:

TRANSPORT_NAME[0]=ip
NDD_NAME[0]=ip_ire_gw_probe
NDD_VALUE[0]=0

(use next higher integer if you already have entries here.)

and reboot. (You need to edit nddconf anyway so that it remembers after a reboot).

Ron

Re: network problem

Fadia Almarei — Thu, 23 Sep 2004 03:55:46 GMT

thanks alot for answering, but i think that the network team stop ping utility to the router as this server is in another subnet from the one we telnet to it from ,is this caused the problem of stop connecting to this workstaion ,as it happened suddenly

Re: network problem

Ron Kinner — Thu, 23 Sep 2004 09:10:26 GMT

This is exactly what you would expect when the network team stops ping. Make the changes I suggested and it will work again.

Ron

PS if ndd does not recognize the command then you are missing a patch.