*BSD News Article 83028


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From: jagnew@csugrad.cs.vt.edu (H. Jared Agnew)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: Two devices with same IP
Date: 16 Nov 1996 22:37:26 -0500
Organization: Virginia Tech Computer Science Dept, Blacksburg, VA
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Message-ID: <56m19m$u08@csugrad.cs.vt.edu>
References: <56ltqk$nhv@csugrad.cs.vt.edu> <56lvvc$62f$1@gail.ripco.com>
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I'm sorry I must not have been clear enough, I'm talking about having two
devices, be they ethernet cards or modems in one machine with the same IP.

    -------     192.168.0.1     --------    192.168.0.1  ---------
    ^local net  ^ethernet card  ^dual holmed host  ^modem   ^world

Thanks

---  Jared
--jared@vt.edu

David Richards (dr@ripco.com) wrote:
: 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!