Date: Thu, 5 Sep 2002 12:54:10 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Wayne Pascoe <freebsd@penguinpowered.org.uk> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: IP Aliases in different subnets Message-ID: <20020905115410.GC32849@happy-idiot-talk.infracaninophi> In-Reply-To: <m2vg5k4pwv.fsf@set.ehsrealtime.com> References: <m2vg5k4pwv.fsf@set.ehsrealtime.com>
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On Thu, Sep 05, 2002 at 11:49:36AM +0000, Wayne Pascoe wrote:
> I've got a question about IP aliases in different subnets. Since
> around 4.5-RELEASE, the subnet mask of an IP alias is now supposed to
> be 255.255.255.255. This is fine if all of the aliases are in the same
> subnet as the primary IP address for the adaptor.
>
> My question is what happens if I have a primary address with a
> different subnet mask to the alias? What should I be using as my
> subnet mask for the alias in /etc/rc.conf
>
> For example:
> Primary Address - 192.168.1.129 netmask 255.255.255.192
> First Alias - 192.168.1.193 netmask 255.255.255.224
That's correct. For each distinct subnet, the first IP address
(whether a primary or alias address) thereon should use the
appropriate netmask for each subnet. It's the second and subsequent
aliases on a subnet that have to have the 255.255.255.255 netmask.
Cheers,
Matthew
--
Dr Matthew J Seaman MA, D.Phil. 26 The Paddocks
Savill Way
Marlow
Tel: +44 1628 476614 Bucks., SL7 1TH UK
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