Date: Tue, 19 Dec 1995 14:45:03 -0500 From: "Garrett A. Wollman" <wollman@lcs.mit.edu> To: Peter Berger <peterb@telerama.lm.com> Cc: Terry Lambert <terry@lambert.org>, "Garrett A. Wollman" <wollman@lcs.mit.edu>, freebsd-questions@freefall.freebsd.org Subject: Re: 2 (or more) LAN interface on SAME subnet ? Message-ID: <9512191945.AA15941@halloran-eldar.lcs.mit.edu> In-Reply-To: <Pine.BSI.3.91.951219141540.835A-100000@ivory.lm.com> References: <199512191750.KAA14777@phaeton.artisoft.com> <Pine.BSI.3.91.951219141540.835A-100000@ivory.lm.com>
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<<On Tue, 19 Dec 1995 14:19:19 -0500 (EST), Peter Berger <peterb@telerama.lm.com> said:
> -------------
> 147.72.1.2 | 147.72.56.1--------------147.72.56.1 -----------
> (netblazer) |----------------------|FreeBSD |================|..56.2 |
> ------------- -------------- ---(pc)----
> ^ppp link ^ethernet
> Both tun0 and ep0 have the same IP address (147.72.56.1). I haven't
> noticed any problems just yet. Are you saying that this is somehow
> invalid, and need difference networks on each interface?
This is invalid, but as a special case we include hackery to make it
work most of the time. It only works for you because the second link
is a point-to-point interface, so the kernel installs a host route to
the destination.
If your situation were:
147.72.56.nnn/24 147.72.56.nnn/24
==================|FreeBSD|==================
Then it wouldn't work, because the kernel would be unable to figure
out which interface to use.
-GAWollman
--
Garrett A. Wollman | Shashish is simple, it's discreet, it's brief. ...
wollman@lcs.mit.edu | Shashish is the bonding of hearts in spite of distance.
Opinions not those of| It is a bond more powerful than absence. We like people
MIT, LCS, ANA, or NSA| who like Shashish. - Claude McKenzie + Florent Vollant
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