ifdown

[David Henderson]

Hello everyone!  I'm working some more with the 'if*' commands and come 
across an issue and wanted to ask about it here.  I have a script that 
calls 'ifdown' for an adapter like: ifdown -f lan01 && echo success || 
echo failure.  I noticed that it wasn't executing correctly so I 
performed the step manually from the command line like:

# ifdown lan01 && echo success || echo failure
ifdown: interface lan01 not configured
success
# ifconfig
lan01     Link encap:Ethernet  HWaddr 00:27:0E:17:99:35
           inet addr:192.168.0.198  Bcast:192.168.0.255  Mask:255.255.255.0
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:340 errors:0 dropped:0 overruns:0 frame:0
           TX packets:109 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:100
           RX bytes:34257 (33.4 KiB)  TX bytes:15911 (15.5 KiB)
           Memory:d0d00000-d0d20000

lo        Link encap:Local Loopback
           inet addr:127.0.0.1  Mask:255.0.0.0
           UP LOOPBACK RUNNING  MTU:16436  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:0
           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

I see two issues right off the top.  First, as you can see, the lan01 
interface does exist but isn't seen by 'ifdown', and second, it's exit 
status doesn't appear to be correct as it should have shown 'failure' 
instead of 'success'.  Currently I'm working around the issue by calling 
'ifconfig lan01 down' which does work correctly.  Any ideas as to what's 
going on here?  These are all busybox applets, btw.

Thanks,
Dave