RTFM

     If the -A flag is also specified, any relevant interface alias informa-
     tion is also displayed.

Doug Junkins <junkins@foghead.com> writes:

> Running NetBSD 1.3.3 on a sparc4c.  I have an alias address configured
> on le0 and it seems to be working properly, but the alias address does
> not appear in an ifconfig output as I would expect from past experience
> with FreeBSD.
> 
> crane# cat ifaliases
> 192.147.160.201 le0 255.255.255.224
> crane# ping 192.147.160.201
> PING www.weaselboy.org (192.147.160.201): 56 data bytes
> 64 bytes from 192.147.160.201: icmp_seq=0 ttl=255 time=0.877 ms
> 64 bytes from 192.147.160.201: icmp_seq=1 ttl=255 time=1.476 ms
> ^C
> ----www.weaselboy.org PING Statistics----
> 2 packets transmitted, 2 packets received, 0% packet loss
> round-trip min/avg/max = 0.877/1.177/1.476 ms
> crane# ifconfig le0 
> le0: flags=8863<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         media: manual status: active
>         inet 192.147.160.13 netmask 0xffffffe0 broadcast 192.147.160.31
> crane# 
> 
> -Doug