Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!newstop!eastapps!deitrick!ckollars From: ckollars@deitrick.East.Sun.COM (Chuck Kollars - Sun Technical Marketing - Boston) Newsgroups: comp.protocols.tcp-ip Subject: Re: How to set up subnets where logical subnet != physical subnet Keywords: subnet routing Message-ID: <5520@eastapps.East.Sun.COM> Date: 15 Apr 91 17:03:43 GMT References: Sender: news@East.Sun.COM Reply-To: ckollars@east.sun.com (Chuck Kollars - Sun Technical Marketing - Boston) Organization: Sun Microsystems, Billerica MA Lines: 25 In article gah@hood.hood.caltech.edu (Glen Herrmannsfeldt) writes: >More than one subnet on a physical cable.... > >This is possible. I understand that cisco routers actually know >how to do this. Otherwise, the two interface method. >THe two interface method does not work for machines that assign >the same ethernet (hardware) address to all ports on the machine. >Suns do this, I don't know about others. Some machines default to using the same Ethernet address on all interfaces, some default to using different Ethernet addresses on all interfaces, and some don't allow you to override the default with whatever you really want. Sun machines have flip-flopped their default behavior, since half the world is unhappy if the default is one way, and the other half the world is unhappy if the default is the other way. More important than the default is that Sun machines don't _force_ you do do it either way -- you're welcome to override the default to meet your needs. cheers! --- chuck kollars Sun Technical Marketing, located in Sun's Boston Development Center