IP aliases and forcing outbound IP

[patrick]

I have a FreeBSD 4.11 box whose ethernet card has several IP address. 

        inet 10.0.1.254 netmask 0xffffff00 broadcast 10.0.1.255
        inet 10.0.1.111 netmask 0xffffffff broadcast 10.0.1.111

Is there a way I can cause outbound connections to certain hosts to be
from 10.0.1.111 instead of the default 10.0.1.254? I used to be able
to do this fairly easy in Linux because each alias is actually a
separate ethernet device (eg. eth0:0, eth0:1, etc.), but I haven't
figured out how to do this in FreeBSD.

Patrick