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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!news.mel.connect.com.au!munnari.OZ.AU!news.hawaii.edu!ames!usenet.kornet.nm.kr!news.kreonet.re.kr!news.dacom.co.kr!newsrelay.netins.net!solaris.cc.vt.edu!news.mathworks.com!fu-berlin.de!cs.tu-berlin.de!uni-erlangen.de!news.tu-chemnitz.de!narses.hrz.tu-chemnitz.de!irz401!uriah.heep!news From: j@uriah.heep.sax.de (J Wunsch) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: Multiple Ip Addresses Date: 9 Mar 1996 16:14:34 GMT Organization: Private BSD site, Dresden Lines: 21 Message-ID: <4hsapa$2ht@uriah.heep.sax.de> References: <4hgcl0$5p@plaster.csdc.toshiba.com.au> <4ho9l5$l2a@news.ios.com> Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) NNTP-Posting-Host: localhost.heep.sax.de Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Newsreader: knews 0.9.3 gmann@haven.ios.com (Glen Mann) writes: > I had success with > > ifconfig de0 inet alias a.b.c.d > > but had seen that another post had put a netmask (ffffffff I think) on the > end. Anyone know why the netmask? The IP I used was valid and within > the same domain as the "base" host. The domain (in the DNS sense) is quite uninteresting. However, if your alias is in the same network range as the primary address, the kernel needs to know which address to stick as the sender address of the outgoing packets. Hence, netmask 0xffffffff for all `secondary' addresses. -- 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. ;-)