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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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