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- Path: sparky!uunet!caen!hellgate.utah.edu!cc.usu.edu!jrd
- From: jrd@cc.usu.edu (Joe Doupnik)
- Newsgroups: comp.protocols.tcp-ip
- Subject: Re: PCS WITH DUPLICATE TCP ADDRESSES
- Message-ID: <1992Dec21.231403.62217@cc.usu.edu>
- Date: 21 Dec 92 23:14:02 MDT
- References: <1992Dec19.000209.1@kean.ucs.mun.ca> <1992Dec19.135454.548@fallst> <1992Dec20.094107.1@kean.ucs.mun.ca>
- Organization: Utah State University
- Lines: 39
-
- In article <1992Dec20.094107.1@kean.ucs.mun.ca>, wayne@kean.ucs.mun.ca writes:
- > In article <1992Dec19.135454.548@fallst>, tkevans@fallst (Tim Evans) writes:
- >> wayne@kean.ucs.mun.ca writes:
- >>
- >>>My question is " Is there a way to prevent a pc from accessing the network
- >>>if there is already a pc on the network at that moment with the same tcp
- >>>address as the one attempting access ?
- >>
- >> If kermit supports use of 'bootp' (I don't know if it does), you can
- >> use it to control IP addresses from a central server. This works on
- >> a real network. You can get UNIX bootp from CMU.
- >> --
- >> UUCP: {rutgers|ames|uunet}!mimsy!wb3ffv!fallst!tkevans
- >> INTERNET: tkevans%fallst@wb3ffv.ampr.org
- >> Tim Evans 2201 Brookhaven Ct, Fallston, MD 21047
- >
- > Is there a VMS bootp from CMU ? I looked via FTP and saw unix-based bootp
- > files but no VMS-based ones.
- >
- > /sig
- --------------
- Yes, MS-DOS Kermit supports both Bootp and RARP. My site prefers
- Bootp. However, when we had the main VAX service it with TGV's Multinet
- the console log registered each request (translation: monitor screen gets
- written all over by such traffic). So we moved the main Bootp server to
- a Sun box.
- Just the other day I added a small item which might be useful in
- the next release of Kermit. If the Bootp server includes the client's IP
- name in the response then I strip off the first word and dot and use the
- remainder as the domain extension appended during DNS lookups. It seems
- to be ok so far, and I'll provide an out just in case.
- What I have not done is ping my own IP looking for conficts. I have
- a Ping built-in but the trouble of doing this (and explaining results to
- users) seems more than it's worth. However, if people feel strongly about it
- I can turn on the feature. Last year my students did some simple tests of
- bringing up Kermits with the same IP. The worst that happened was a connection
- would be dropped as routers got confused. Of course, just plucking IP addresses
- out of thin air is plenty of trouble.
- Joe D.
-