I am observing the same thing.
$ cat /etc/network/interfaces
[...]
auto eth1
iface eth1 inet static
address 10.10.0.254
netmask 255.255.255.0
network 10.10.0.0
broadcast 10.10.0.255
# our noc interface
auto eth1:0
iface eth1:0 inet static
address 10.10.0.250
netmask 255.255.255.0
network 10.10.0.0
broadcast 10.10.0.255
$ ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:01:c0:08:be:87
inet addr:10.0.1.20 Bcast:10.0.1.255 Mask:255.255.255.0
inet6 addr: fe80::201:c0ff:fe08:be87/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:15065 errors:0 dropped:0 overruns:0 frame:0
TX packets:7988 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:21580667 (21.5 MB) TX bytes:644456 (644.4 KB)
Interrupt:40
eth1 Link encap:Ethernet HWaddr 00:01:c0:08:be:88
inet addr:10.10.0.254 Bcast:10.10.0.255 Mask:255.255.255.0
inet6 addr: fe80::201:c0ff:fe08:be88/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1165 errors:0 dropped:0 overruns:0 frame:0
TX packets:1040 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:170646 (170.6 KB) TX bytes:631042 (631.0 KB)
Interrupt:41 Base address:0x2000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:45 errors:0 dropped:0 overruns:0 frame:0
TX packets:45 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:5701 (5.7 KB) TX bytes:5701 (5.7 KB)
wlan0 Link encap:Ethernet HWaddr 00:0d:f0:95:74:07
BROADCAST 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 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
$ ifconfig eth1:0
eth1:0 Link encap:Ethernet HWaddr 00:01:c0:08:be:88
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:41 Base address:0x2000
$ ping 10.10.0.250
PING 10.10.0.250 (10.10.0.250) 56(84) bytes of data.
64 bytes from 10.10.0.250: icmp_req=1 ttl=64 time=0.236 ms
64 bytes from 10.10.0.250: icmp_req=2 ttl=64 time=0.110 ms
64 bytes from 10.10.0.250: icmp_req=3 ttl=64 time=0.124 ms
^C
$ uname -a
Linux noc 3.0.0-12-generic-pae #20-Ubuntu SMP Fri Oct 7 16:37:17 UTC 2011 i686
i686 i386 GNU/Linux
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https://bugs.launchpad.net/bugs/921280
Title:
ifconfig does not display sub-interfaces (aka: eth0:1 )
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