eth0 down... then what...

[Harald Hoyer]

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...

try
# ifup eth0
instead

> 
> Q: what command can I use to determine why I no longer have an internet
> conection? netstat and ifconfig just give me a lovely bunch of summary
> info. What do I need to look at/do to:
> 1. verify that I am down
> 2. get the internet active again.
> (NO GUI PROGRAMS - command line answers only please! - although that's
> appearantly the only way to manage disk volumes & volume groups (whoah -
> later discussion!) )
> 

# ifdown eth0
# (ip link show eth0 | fgrep -q UP) && echo "eth0 up" || echo "eth0 down"
eth0 down
# ifup eth0
# (ip link show eth0 | fgrep -q UP) && echo "eth0 up" || echo "eth0 down"
eth0 up