How to restart my Internet connection?

[Johnny Rosenberg]

Ubuntu 11.04, Eee PC 900:
Sometimes after waking it up after sleep (hibernation, I guess – I put
it to sleep with the ”Zzz”-button, that is Fn+1), my Internet
connection (wired broadband) doesn't work. Logging out and then in
again doesn't usually help, but a total restart usually does.
Exactly what can I restart (and how) from a terminal, so I don't need
to restart the whole computer again?
I guess the Hibernation thing will never work properly in the next 200
years anyway, but I'm fine if there is a nice workaround to get things
going again after a failed wake-up, like an icon to click or
something.

If there are a few things to restart, and therefore a few commands
needed, the plan is to just put those commands in a script that I can
run every time this happens. I already do this when Compiz-fusion,
Emerald and Empathy fails with Ubuntu 10.10 on my other computer
(which is quite often), and even though it's not perfect, I can live
with it at the moment, as long as the cure is a single mouse click.


Kind regards

Johnny Rosenberg
ジョニー・ローゼンバーグ