Re: HPUX and Direct Routing

To: " users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: HPUX and Direct Routing
From: Andreas Lundqvist <lvs@xxxxxx>
Date: Thu, 23 Mar 2006 16:05:50 +0100
On Thursday 23 March 2006 14:24, Joseph Mack NA3T wrote:

> I hope that's not what the documentation says (let me know
> if it is). HPUX doesn't honor the -noarp flag (or it didn't
> back when we tried it last) in the same way that linux-2.2+
> doesn't.

Regarding the documentation, I did google searches and I guess I found some 
old info.

It still doesn't on an physical interface thats already up but on loopback it 
never arp's regardless of the -arp/arp switch.
> You can set up an LVS with all the realservers arp'ing and
> it will work as long at the router gets the MAC address of
> the director each time. My first LVS was like this and I
> didn't realise I hadn't solved the arp problem at all. I was
> just lucky.
> > Am I missing something?
> can't tell.
> Can you turn arp'ing back on, show that the router gets the
> MAC address of the realservers, and have the LVS stop
> working?
> Joe

I did a tcpdump on the interface when I took up the loopback interface alias 
and there wasn't any arp request/broadcast on the interface that carries the 

Does it matter what netmask/broadcast I use on the loopback alias?
I've seen examples that looks like this:

vip: netmask broadcast

On realserver it the looks like this: netmask broadcast

But an netmask on HPUX loopback gets an error message so I'm 
forced to use my normal netmask.

Do you see any problems with this?


Andreas Lundqvist
08-76 49994

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