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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!simtel!news.kei.com!news.mathworks.com!newsfeed.internetmci.com!EU.net!Germany.EU.net!zib-berlin.de!irz401!uriah.heep!not-for-mail From: j@uriah.heep.sax.de (J Wunsch) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: ip aliasing Date: 13 Oct 1995 08:40:43 +0100 Organization: Private FreeBSD site, Dresden. Lines: 22 Message-ID: <45l55r$3e6@uriah.heep.sax.de> References: <44pjfu$2o7@news.cerf.net> <44rkir$d3n@uriah.heep.sax.de> <813430816.2768@kiss.demon.co.uk> NNTP-Posting-Host: uriah.heep.sax.de Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Phil Taylor <phil@zipmail.co.uk> wrote: >>This is a FAQ now. Use "netmask 0xffffff00" (or whatever is >>appropriate) for the first IP address, and "netmask 0xffffffff" for >>all aliases that happen to be in the same (sub)net as the primary one. >Is this a work-around or is it the correct way to do things, It just >seems a bit strange cause your class A/B/C hasn't changed so I would >have thought that the netmask would be the same for all addresses. It is the correct way. Think about it. You have multiple interfaces refering to the same network. You *have* to chose one of the various interface addresses as the "gateway" for outgoing packets into this network, you cannot have them going out through a dozen of addresses simultaneously. The netmask 0xffffffff prevents the kernel from considering this IP address as a valid gateway (since it's not pointing to any network at all). -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)