Date: Mon, 23 Jul 2007 21:50:54 -0700 From: Jeremy Chadwick <koitsu@FreeBSD.org> To: Evren Yurtesen <yurtesen@ispro.net> Cc: freebsd-hackers@freebsd.org Subject: Re: alias netmask bug? Message-ID: <20070724045054.GA81397@eos.sc1.parodius.com> In-Reply-To: <46A5492E.90500@ispro.net> References: <46A5492E.90500@ispro.net>
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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. -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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