*BSD News Article 83025


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From: dr@ripco.com (David Richards)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: Two devices with same IP
Date: 17 Nov 1996 03:14:52 GMT
Organization: Ripco Communications Inc.
Lines: 27
Message-ID: <56lvvc$62f$1@gail.ripco.com>
References: <56ltqk$nhv@csugrad.cs.vt.edu>
NNTP-Posting-Host: rci.ripco.com

In article <56ltqk$nhv@csugrad.cs.vt.edu>,
H. Jared Agnew <jagnew@csugrad.cs.vt.edu> wrote:
>  I have a friend that uses Redhat-4.0.  He was giving me flac about the fact
>that FreeBSD will not allow the same IP on more than one device.  I talked
>to a few friends and they told me that this was because haveing two devices
>with the same IP is against TCP/IP standards or something.  If anyone knows
>where I could read more about this could you please post.  Maybe a FAQ or
>RFC???  Thanks

Correct.

One system can have more than one IP address assigned to it, but it is
utterly WRONG to have more than one machine with the same MAC or IP
address.

That Linux would allow this is no suprise to me :-)


Perhaps he's talking about "IP Masquerade" where a Linux box can "hide"
several machines behind it, using it's IP address for connections to/from
those machines? Handy for cheap users whose ISP won't provide them with
additional addresses.
--
David Richards                             Ripco, since Nineteen-Eighty-Three
My opinions are my own,                    Public Access in Chicago
But they are available for rental          Shell/SLIP/PPP/UUCP/ISDN/Leased
dr@ripco.com                               (312) 665-0065 !Free Usenet/E-Mail!