topic Re: IP Conflict in Operating System - HP-UX

IP Conflict

Bob Larkin — Thu, 14 Nov 2002 18:31:30 GMT

I'm hoping somebody can give me a little help. I have two K460s tha I'm re-configuring to be used for a new project. I got system A up and running and then used Ignite to make a tape to clone system B with. Both systems use a FDDI connection to access the network. The built in lan is disabled. When system B is up, system A loses connectivity to the network. As soon as I shutdown system B, system A is back online. I'm assuming that there's something on system B that's using system A's (the Ignite source) IP, but I can't find it. SAM shows the right IP for system B's FDDI. Where did I go wrong? Thanks.

Re: IP Conflict

Judy Traynor — Thu, 14 Nov 2002 18:33:49 GMT

cd /etc/rc.config.d/

look in the fiddi config file

note the mac address -
make sure they are not the same.
in Netconf, make sure the ip addresses are different.

reboot one of the machines.

Re: IP Conflict

RAC_1 — Thu, 14 Nov 2002 18:39:12 GMT

put one server off and then assign different ip to host B and then bring up hosts A. Check IP and let us know the errors if any.

Re: IP Conflict

Jeff Schussele — Thu, 14 Nov 2002 18:40:50 GMT

Hi Bob,

If the IPs are correct in the /etc/rc.config.d/netconf file, I'd check the /etc/rc.config.d/hpfddiconf & make sure that they don't BOTH have the same HP_FDDI_STATION_ADDRESS value.
They have to be unique.

Rgds,
Jeff

Re: IP Conflict

John Palmer — Thu, 14 Nov 2002 18:43:32 GMT

If your original server had a 'hard wired' MAC address - check in /etc/rc.config.d/hphscfddiconf and look for the array variable HP_HSCFDDI_STATION_ADDRESS then your ignited server will have inherited it.

Duplicate MAC addresses cause big problems.

Regards,
John

Re: IP Conflict

Deshpande Prashant — Thu, 14 Nov 2002 18:47:03 GMT

Hi
Check in netconf and the fddi config file in /etc/rc.config.d/
On server B are you able to ping outside world?

Thanks.
Prashant.

Re: IP Conflict

Bob Larkin — Thu, 14 Nov 2002 19:02:06 GMT

Thanks, the station address looks like the problem. The hpfddiconf file on both systems shows the same station address. Now, how do I determine the correct address? The hpfddiconf file indicates that it can't be changed, how do I change it? Thanks again

Re: IP Conflict

Deshpande Prashant — Thu, 14 Nov 2002 19:05:24 GMT

Hi
Run lanscan to get mac addresses for cards.

Thanks.
Prashant.

Re: IP Conflict

Bob Larkin — Thu, 14 Nov 2002 19:14:40 GMT

lanscan is showing the same address on both systems.

Re: IP Conflict

Deshpande Prashant — Thu, 14 Nov 2002 19:15:42 GMT

HI
In fact I would leave the station address in config file to be blank. so in future even in case you are required to change the fddi card due to failure, you will not have this problem.

Thanks.
Prashant.

Re: IP Conflict

Jeff Schussele — Thu, 14 Nov 2002 19:32:36 GMT

If you blank that field in hpfddiconf & restart the net, then a lanscan should return the real MAC on these.
I'd just leave that field blank on both systems. That should solve the problem.

Rgds,
Jeff

Re: IP Conflict

Bob Larkin — Fri, 15 Nov 2002 11:55:52 GMT

Thanks, I blanked out the station address settings and both systems are now back on the network. Thanks again!

Re: IP Conflict

Judy Traynor — Fri, 15 Nov 2002 13:08:31 GMT

In my experience with this problem, we simply plug an mac address in and it works, but you can, if you want - reinstall the fddi software (its an addon)
swremove it
reboot
swinstall it -

that will solve all your problems.

Or you could let it go and just increment your mac address by the lsb -
chances are that you will never see the problem again.