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List: freebsd-hackers
Subject: Re: alias netmask bug?
From: Tom Judge <tom () tomjudge ! com>
Date: 2007-07-24 8:25:14
Message-ID: 46A5C5B9.3000005 () tomjudge ! com
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Jeremy Chadwick wrote:
> On Tue, Jul 24, 2007 at 03:34:54AM +0300, Evren Yurtesen wrote:
>> I remember from earlier versions of FreeBSD that it had a restriction about
>> alias IP netmasks (somewhere in 3.x,4.x days)...
>>
>> as explained here:
>> http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/configtuning-virtual-hosts.html
>>
>> However I tried on the loopback interface to add a 2nd IP with the same
>> netmask as the original IP and it accepts it fine. (on 6.2)
>>
>> lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
>> inet 127.0.0.1 netmask 0xff000000
>> inet 127.0.0.2 netmask 0xff000000
>>
>> Is FreeBSD allowing this a bug or ???
>
> It's not a bug. Why did you disregard the instructions, though?
>
>> If this is not a bug. What happens if an interface which is connecting to
>> the machine has 2 IP addresses with same netmask which is not
>> 255.255.255.255? Does FreeBSD use each IP randomly?
>
> Don't know, but my guess is no, it probably does not use "each IP
> randomly", and I cannot even fathom the network breakage that would
> ensue as a result of such.
>
I have seen systems that have been configured like this (on physical
interfaces) have some strange problems. I'm sure one box that got a
config like this by accident kicked one of the IP's off the interface
several hours after it was set up. Never been able to reproduce that
though.
Tom
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