topic Re: How do I multihome a server? in Operating System - HP-UX

How do I multihome a server?

T Anderson — Tue, 22 Apr 2003 14:48:28 GMT

I have 2 L-Class servers that I am trying to get a second interface to with with.

I plumbed the interface and it shows UP in ifconfig. However, landiag shows this interface's Operational Status ad down.

The first interface works fine.

What am I missing? How do I go about getting traffic through the second interface?

Thanks.

Re: How do I multihome a server?

Berlene Herren — Tue, 22 Apr 2003 17:47:55 GMT

Is it configured on a different subnet that the first one?

Berlene

Re: How do I multihome a server?

Vinit Adya — Tue, 22 Apr 2003 18:28:08 GMT

The other interface must be on a different subnet to work correctly. Make sure its configured that way.

Also check the error counters for any alingment errors, carrier errors etc. with will suggest ethernet problem.

Re: How do I multihome a server?

T Anderson — Tue, 22 Apr 2003 19:10:49 GMT

Yes, they are on different subnets.

Re: How do I multihome a server?

Berlene Herren — Wed, 23 Apr 2003 12:44:17 GMT

Check the nettl log for errors.

#netfmt -f /var/adm/nettl.LOG00 > /tmp/log.out

Berlene

Re: How do I multihome a server?

Todd Whitcher — Wed, 23 Apr 2003 13:56:00 GMT

Hello,

A few steps / thoughts:

1. Whats ioscsan -fnC lan show for that interface?

$ ioscan -fnC lan:

2. Can you linkloop to the mac address of the interface ?
ex.
Use lanscan to get the station address:

$ linkloop -v 0x0060B0D0430A
Link connectivity to LAN station: 0x0060B0D0430A
-- OK

Whats lanadmin -x ppa# say ?

lan0 ppa=0 lan1 ppa=1 etc.

Whats the output of netstat -in ?

Whats the oupput of ifconfig lanX ?

Whats happens when you ping the ip ?
What happens when you ping the broadcast?

Post that data, that should help lead to a resolution?

Todd

Re: How do I multihome a server?

rick jones — Wed, 23 Apr 2003 17:49:36 GMT

IIRC operational status down suggests a link-level problem. make sure you have good cables and that the switch port is good. If you have another HP-UX system on the same broadcast domain (I'd say subnet, but it isn't in the IP sense of the word) you can use linkloop(1m) to perform "link-level pings" to check the interface without having IP working.

There are indeed ways to have multiple, physical interfaces configured into the same IP subnet. By default they may not work as one might "expect" but there are also ways to deal with that, discussion of whcih can be found in the archives I suspect.