IPv4 loopback address is missing, why?

[Andrew Falanga]

HI,

On my father's computer there isn't an IPv4 loopback address being assigned to 
the lo0 interface.  What would cause this?  I've looked at his configs and 
they're the same as on my system (obviously something is different, but I 
don't know what).  I see in his /etc/defaults/rc.conf the "ifconfig_lo0" line 
is *NOT* commented out or otherwise altered and his file looks the same as 
mine (at least on this point, I haven't contrasted the two entirely).

So, why would his system not be configuring an IPv4 loopback address?  After 
bootup, I can add the address manually using ifconfig.

Andy