Date: Wed, 29 Jun 2011 18:10:37 +0300 From: Oleg Cherevko <olwi@fb-n.l.org.ua> To: freebsd-net@freebsd.org Subject: ifconfig alias: same subnet netmask question Message-ID: <4E0B406D.8070406@fb-n.l.org.ua>
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Hi All, When describing the "alias" parameter ifconfig manpage claims that "If the address is on the same subnet as the first network address for this interface, a non-conflicting netmask must be given. Usually 0xffffffff is most appropriate." Taking into account that FreeBSD supports aliases from the same subnet with identical netmask for 6+ years now, does this statement still make sense? And what does this "conflicting netmask" stand for (I mean in the context of more or less recent FreeBSD versions, say 8.0+)? Are there any drawbacks in setting aliases like this: ifconfig em0 inet 192.168.1.1 netmask 0xffffff00 ifconfig em0 inet 192.168.1.2 netmask 0xffffff00 instead of traditional: ifconfig em0 inet 192.168.1.1 netmask 0xffffff00 ifconfig em0 inet 192.168.1.2 netmask 0xffffffff (again, for more or less recent FreeBSD versions)? -- Olwi
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