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Date:      Thu, 12 Sep 1996 13:39:38 +1000 (EST)
From:      "Daniel O'Callaghan" <>
To:        Jos Vissers <>
Cc:        Bill Fenner <>, questions@FreeBSD.ORG, isp@FreeBSD.ORG
Subject:   Re: Why does arp not work when ip-alias installed
Message-ID:  <>
In-Reply-To: <>

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On Thu, 12 Sep 1996, Jos Vissers wrote:

> It did some further testing and it only appears to happen
> when I add an ip-alias in another class-c network.
> I used "ifconfig alias netmask 0xffffff00" and
> the machine's regular ip address is
> When I remove the alias again it refuses to start working.
> The problem doesn't occurr when I define aliases in the same
> class-c with - of course - a netmask of 0xffffffff.
> Is this my error? Should I use 2 different ethernet cards
> when using different class-c addresses on one machine?
> Another of our servers with 2 cards doesn't have this problem.

I put my class C of aliases onto lo0.  I have only a single IP address on 
ed0.  How have you allocated your aliases and how do you send traffic to 

I have on www:
ifconfig ed0
ifconfig lo0 alias
ifconfig lo0 alias

And on the routers around the equivalent of:

route add 

See if that helps.


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