Date: Wed, 14 Jul 2004 10:41:04 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Darren Pilgrim <dmp@bitfreak.org> Cc: 'freebsder' <freebsder51@yahoo.com> Subject: Re: Freebsd 5.1 <-> Win XP Networking problems Message-ID: <20040714094104.GA71531@happy-idiot-talk.infracaninophile.co.uk> In-Reply-To: <001001c46920$f347b790$152a15ac@spud> References: <20040713200422.36735.qmail@web52502.mail.yahoo.com> <001001c46920$f347b790$152a15ac@spud>
next in thread | previous in thread | raw e-mail | index | archive | help
--Qxx1br4bt0+wmkIi
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable
On Tue, Jul 13, 2004 at 02:32:46PM -0700, Darren Pilgrim wrote:
> > ifconfig_ed0=3D"inet 192.168.1.0/24 netmask 255.255.0.0"
> > ifconfig_vr0=3D"inet 192.168.0.0/24 netmask 255.255.0.0"
>=20
> 192.168.1.0/24 and 192.168.0.0/24 are blocks of addresses in CIDR notatio=
n,
> not the actual addresses to be fed to ifconfig. You need to pick address=
es
> within the netblock to use for myserver and all the other machines on your
> network. Since myserver can reach the internet just fine, you should keep
> the IP address for vr0 the same, just lengthen the netmask to allow the u=
se
> of 192.168.1.0/24 on the LAN.
ifconfig(8) understands CIDR notation just fine, although it's not
usual to configure an interface using the '.0' /network/ address. Look
on it as a third alternate way of specifying the netmask, so that the
following three examples are equivalent:
ifconfig fxp0 inet 192.168.123.74/29
ifconfig fxp0 inet 192.168.123.74 netmask 0xfffffff8
ifconfig fxp0 inet 192.168.123.74 netmask 255.255.255.248
Those correspond to the slightly contrived example of the /29 network
starting with network address 192.168.123.72 and running up to the
broadcast address 192.168.123.79
Note: you can give a broadcast address on the ifconfig command line,
but usually it's not necessary as a standard value will be calculated
=66rom any ip number forming part of that network and from the netmask.
However you can't in general use ip address + broadcast to do the
converse, as there isn't necessarily a unique solution.
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
--Qxx1br4bt0+wmkIi
Content-Type: application/pgp-signature
Content-Disposition: inline
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.4 (FreeBSD)
iD8DBQFA9P+wiD657aJF7eIRArjmAJ9dhKNttAuTzlWXTQBKnymyiPtLAgCcDQUO
wl+R3TPEo0NLSMFlDFwlm+w=
=bZuS
-----END PGP SIGNATURE-----
--Qxx1br4bt0+wmkIi--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20040714094104.GA71531>