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From: BILLW@MATHOM.CISCO.COM (William Westfield)
Newsgroups: comp.protocols.tcp-ip
Subject: Re: Ethernet Bridge
Message-ID: <12348272453.8.BILLW@MATHOM.CISCO.COM>
Date: Thu, 5-Nov-87 17:06:28 EST
Article-I.D.: MATHOM.12348272453.8.BILLW
Posted: Thu Nov  5 17:06:28 1987
Date-Received: Wed, 11-Nov-87 06:22:14 EST
References: <1940@uwmacc.UUCP>
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
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    Now, what I'm gonna do is put a permanent entry in Elsie's
    ARP cache with Bossie's IP number and ethernet address.

Well, first of all, the idea of loading up your host with
permanent ARP entries is pretty gross, and defeats the the
purpose of ARP anyway.

Second, and more important is that hardware ethernet addresses
aren't any more imutable that IP addresses anyway - I can easilly
change my hardware adrress to anything I want.  DECNet does this
sort of thing as a matter of course - setting the decnet host
numbers into the hardware address.  Thus having a permanant
ARP entry doesn't buy you much additional security anyway.

Bill Westfield
cisco Systems.
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