From owner-freebsd-questions  Sat Dec 15 16:11: 1 2001
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Date: Sat, 15 Dec 2001 16:10:52 -0800 (PST)
From: "f.johan.beisser" <jan@caustic.org>
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To: Dave VanAuken <dave@hawk-systems.com>
Cc: <freebsd-questions@FreeBSD.ORG>
Subject: Re: when sensible/possible to assign ubnet to interface
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On Sat, 15 Dec 2001, Dave VanAuken wrote:

> Hosting box has a number of non-consecutive IP addresses on it...
>
> At what time does it make more sense to simply have an entire subnet
> pointing at that interface...  and what would the syntax be to alias
> that.
>
> Rather than
> ifconfig_fxp0="inet 192.168.131.12 netmask 255.255.255.0"
> ifconfig_fxp0_alias0="inet 192.168.131.13 netmask 255.255.255.0"
> ifconfig_fxp0_alias1="inet 192.168.131.51 netmask 255.255.255.0"
> ifconfig_fxp0_alias2="inet 192.168.131.52 netmask 255.255.255.0"
> ifconfig_fxp0_alias3="inet 192.168.131.53 netmask 255.255.255.0"

whenever assigning an aliased interface to the same subnet (in this case,
192.168.131.0/24) use a netmask of 255.255.255.255.

>
> do
> ifconfig_fxp0="inet 192.168.131.12 netmask 255.255.255.0"
> ifconfig_fxp0_alias0="inet 192.168.131.13 netmask 255.255.255.0"
> ifconfig_fxp0_alias1="inet 192.168.131.51/27 netmask 255.255.255.224"
>
> Possible?  Doable?  syntax check?

won't work. read the man page for ifconfig(8).

> thanks
>
> (did a brief but by no mean thorough check on this, RTFM's or net
> resource links appreciated)

most of this is in the man pages, some is a little obscure.


-------/ f. johan beisser /--------------------------------------+
  http://caustic.org/~jan                      jan@caustic.org
    "John Ashcroft is really just the reanimated corpse
         of J. Edgar Hoover." -- Tim Triche


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