eth0 down... then what...

[Christopher K. Johnson]

Robert Achmann wrote:

>ok - newbie admin question...
>
>I want to test out a cool command line command...
>ifconfig eth0 down
>
>wow! I can't connect to the internet...cool.
>ok...
>
>ifconfig eth0 up
>
>no joy...
>  
>
To see the state of interfaces...

ifconfig

To bring eth0 back up with the proper settings...

ifup eth0

The problem with what you tried is that ifdown and ifup utilize the 
interface configurations, but ifconfig takes configuration from command 
line arguments.  So what you did for an interface is like what a 
wrecking ball does for a house.  One cannot demolish a house and then 
put it back by "undemolishing it".  You need house plans to rebuild it.

Using ifdown and ifup work well and take into account all the dynamic 
configuration (like use of dhcp), related routes, etc. when bringing an 
interface down and up.

-- 
-----------------------------------------------------------
   "Spend less!  Do more!  Go Open Source..." -- Dirigo.net
   Chris Johnson, RHCE #807000448202021