The aliases are /32, the physical network is something larger.

I don't think I can say
	ifconfig de0 inet 204.152.184.79 netmask 0xffffffff
and have this work.

And for using a smaller netmask it would require proxy arp on the
routers to really work.  And broadcasting to the local network would
fail.  Etc.

--Michael

Ted Lemon <mellon@hoffman.vix.com> writes:

> Michael, how is this different from just ifconfiging the address from
> which you want packets to originate first, and having the address
> that's currently the primary one be the alias instead?
> 
> i.e., if you're currently doing:
> 
> ifconfig ep0 inet 10.0.0.20 netmask 255.255.255.0
> ifconfig ep0 inet alias 128.45.71.22 netmask 255.255.255.0
> 
> And you want 128.45.71.22 to be the source address, why not just
> reverse it:
> 
> ifconfig ep0 inet 128.45.71.22 netmask 255.255.255.0
> ifconfig ep0 inet alias 10.0.0.20 netmask 255.255.255.0
> 
> 			       _MelloN_