Correct way of bringing network interface down in linux

Posted by Karolis T. on Server Fault See other posts from Server Fault or by Karolis T.
Published on 2009-07-02T08:31:02Z Indexed on 2010/05/26 12:03 UTC
Read the original article Hit count: 331

Filed under:

linux

|

networking

|

ifconfig

For example:

$ ifconfig dummy0 up
$ ifconfig dummy0 "192.168.1.190 netmask 255.255.255.0"

Calling ifconfig with no parameters shows the interface

dummy0    Link encap:Ethernet  HWaddr b6:1f:f3:92:6d:20  
      inet addr:192.168.1.190  Bcast:192.168.1.255  Mask:255.255.255.0
      inet6 addr: fe80::b41f:f3ff:fe92:6d20/64 Scope:Link
      UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
      RX packets:0 errors:0 dropped:0 overruns:0 frame:0
      TX packets:15 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:0 
      RX bytes:0 (0.0 B)  TX bytes:1050 (1.0 KiB)

How can I bring the interface down so that it doesn't show up in

ifconfig
ifconfig -a
ifconfig dummy0

without rmmod dummy

because dummy is used just for example purposes.

If there is no way to do that, what "throw-away" IP could I set to it and be safe from any trouble?

like

$ ifconfig dummy0 down
$ ifconfig dummy0 0.0.0.0

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