ifconfig alias: same subnet netmask question

[Li, Qing]

First of all, are you encountering any issues ?

There is an outstanding issue with the address alias and improper routing
table update that I am actively working on.

--Qing


> -----Original Message-----
> From: owner-freebsd-net at freebsd.org [mailto:owner-freebsd-
> net at freebsd.org] On Behalf Of Oleg Cherevko
> Sent: Wednesday, June 29, 2011 8:11 AM
> To: freebsd-net at freebsd.org
> Subject: ifconfig alias: same subnet netmask question
> 
> 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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