why does ifconfig -a show aliased ips?

[hypnos <hypnos@m-net.arbornet.org>]

Why doesn't `ifconfig -a` show the aliased IPs on my
eth0 device on my server/firewall/gateway?

[hypnos@gatekeeper:tty3:~]$ ifconfig -a
lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:3924  Metric:1
          RX packets:3731 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3731 errors:0 dropped:0 overruns:0 carrier:0
          Collisions:0

eth0      Link encap:Ethernet  HWaddr 00:20:AF:24:79:8C
          inet addr:192.168.1.1  Bcast:192.168.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          Collisions:0
          Interrupt:10 Base address:0x300

ppp0      Link encap:Point-to-Point Protocol
          inet addr:63.29.189.158  P-t-P:206.115.223.117
Mask:255.255.255.255
          POINTOPOINT NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:515 errors:0 dropped:0 overruns:0 frame:0
          TX packets:659 errors:0 dropped:0 overruns:0 carrier:0
          Collisions:0

[hypnos@gatekeeper:tty3:~]$ ifconfig eth0:0
eth0:0    Link encap:Ethernet  HWaddr 00:20:AF:24:79:8C
          inet addr:192.168.1.2  Bcast:192.168.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          Collisions:0
          Interrupt:10 Base address:0x300

[hypnos@gatekeeper:tty3:~]$ uname -a
Linux gatekeeper 2.2.13 #5 Sat Jan 22 19:06:16 EST 2000 i486 unknown

[hypnos@gatekeeper:tty3:~]$ ifconfig --version
net-tools 1.45
ifconfig 1.33 (1998-03-02)

Thanks

------------------------------------------------------
hypnos              <mailto:hypnos@m-net.arbornet.org>