Ubuntu
net-tools package

ifconfig does not display sub-interfaces (aka: eth0:1 )

Bug #921280 reported by Ron
12
This bug affects 3 people
Affects Status Importance Assigned to Milestone
net-tools (Ubuntu)
Confirmed
Undecided
Unassigned

Bug Description

I have noticed a possible regression in ifconfig. When executing # ifconfig , only parent network interfaces are output. ifconfig is failing to display child/sub interfaces (aka. secondary interfaces.)

Also, running "# ifconfig -a" doesn't display the child/sub-interfaces. Although the secondary IP is bound to the parent interface, and functional. The child/sub-interface IP addresses *can* be properly seen on eth0 when using iproute, by running "# ip addr", as expected.

The /etc/network/interfaces file specifies two eth0 interfaces and addresses. Example: (lo entry omitted)

auto eth0
iface eth0 inet static
        address 10.10.10.10
        netmask 255.255.255.0
        broadcast 10.10.10.255
        gateway 10.10.10.1

auto eth0:2
iface eth0:2 inet static
 address 10.10.10.11
 netmask 255.255.255.0

-------------------------

I have observed this on two separate Oneiric-servers, v11.10.

::Critical Details::
Ubuntu Server: Oneiric v11.10
Package net-tools version: 1.60-23ubuntu3
Package ifupdown version: 0.7~alpha5.1ubuntu5

Tags: lucid oneiric
Revision history for this message
Ron (ron-neversleep) wrote :

One additional observation.

When an child/sub-interface is manually created by ifconfig, from the console, ifconfig *DOES* properly display this child interface.

Example Command: "# ifconfig eth0:22 10.10.10.22 netmask 255.255.255.255"

Revision history for this message
Carlos Vicente (cvicente) wrote :

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

Revision history for this message
Thomas Hood (jdthood) wrote :

Another report of this: http://askubuntu.com/questions/227457/ifconfig-not-showing-all-ips-bound-to-the-machine

Changed in net-tools (Ubuntu):
status: New → Confirmed
Revision history for this message
Thomas Hood (jdthood) wrote :

Related Debian bug report is http://bugs.debian.org/324306.

Revision history for this message
Thomas Hood (jdthood) wrote :

FWIW I couldn't immediately reproduce the problem in Quantal. First I added an "iface eth0:0" to /etc/network/interfaces and ifup'ped this and ifconfig did show both eth0 and eth0:0. Then I did "ip -4 addr add 10.0.0.67/24 dev eth0 brd + scope global label eth0:0" and once again ifconfig subsequently showed both eth0 and eth0:0.

tags: added: lucid oneiric
Revision history for this message
Ron (ron-neversleep) wrote :

This may have been fixed in an update. I found an old 11.10 server which '# ifconfig -a', displays properly, and I have also verified proper function on Quantal 12.10.

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