Date: Tue, 9 Mar 2004 14:26:48 +0000 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Jason Williams <jwilliams@courtesymortgage.com> Cc: freebsd-questions@freebsd.org Subject: Re: setting up network virtual hosts (ifconfig) Message-ID: <20040309142648.GC16123@happy-idiot-talk.infracaninophile.co.uk> In-Reply-To: <5.2.1.1.0.20040308164913.02affee8@pop.courtesymortgage.com> References: <5.2.1.1.0.20040308160419.02afa950@pop.courtesymortgage.com> <5.2.1.1.0.20040308160419.02afa950@pop.courtesymortgage.com> <5.2.1.1.0.20040308164913.02affee8@pop.courtesymortgage.com>
next in thread | previous in thread | raw e-mail | index | archive | help
--hOcCNbCCxyk/YU74
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable
On Mon, Mar 08, 2004 at 04:50:47PM -0800, Jason Williams wrote:
> >e.g. something like this works fine here :
> >
> ># /etc/rc.local :
> >ifconfig fxp0 alias 192.168.2.222 netmask 0xffffffff
>=20
> That seemed to have done the trick, manually. Im guessing, I could put th=
e=20
> same thing in my rc.conf file, but with proper syntax:
>=20
> ifconfig_fxp0_alias0=3D"inet 192.168.2.222 netmask 0xffffff
The proper syntax for the netmask on the second and subsequent
interface addresses from each distinct network block is to use the
all-ones netmask: you can express that either as 255.255.255.255 or as
0xffffffff or as /32, whichever suit you best. This is a FAQ on this
list but it still keeps tripping people up -- despite being clearly
documented in ifconfig(8):
alias Establish an additional network address for this interface. T=
his
is sometimes useful when changing network numbers, and one wis=
hes
to accept packets addressed to the old interface. If the addr=
ess
is on the same subnet as the first network address for this
interface, a non-conflicting netmask must be given. Usually
0xffffffff is most appropriate.
However you look at it, 0xffffff could never be a correct netmask.
Cheers,
Matthew
--=20
Dr Matthew J Seaman MA, D.Phil. 26 The Paddocks
Savill Way
PGP: http://www.infracaninophile.co.uk/pgpkey Marlow
Tel: +44 1628 476614 Bucks., SL7 1TH UK
--hOcCNbCCxyk/YU74
Content-Type: application/pgp-signature
Content-Disposition: inline
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.4 (FreeBSD)
iD8DBQFATdQodtESqEQa7a0RAuCtAJkBHBG18aFwzsnQKDkvU4wl5USMAgCfYOSW
i1N3NjfIYwPaemInQWO4i5A=
=+33v
-----END PGP SIGNATURE-----
--hOcCNbCCxyk/YU74--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20040309142648.GC16123>