*BSD News Article 69459


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From: j@uriah.heep.sax.de (J Wunsch)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: ed0 timeouts-help
Date: 26 May 1996 19:02:21 GMT
Organization: Private BSD site, Dresden
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  <xo2RaMD4F99aaz6@borki.zug.use.ch> <31A51E8B.1C6F@www.play-hookey.com>
Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch)
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Ken Bigelow <kbigelow@www.play-hookey.com> wrote:

> > One more point on that -- the two cards in the gateway machine *can* have 
> the same IP address, and if you use a modem to dial up to an ISP it can 
> also have the same IP address.

Nope, they can't.  The rule is one IP address per IP interface.  The
only exceptions of this rules are:

. ``pointopoint'' interfaces (SLIP, PPP), where the kernel considers
  the *remote* IP address for routing purposes, so this one must be
  unique for all connections of the local system (while the local
  address is largely irrelevant), and

. IP aliasing, i.e. multiple IP addresses on a single ethernet
  interface.

-- 
cheers, J"org

joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)