What does Network service do?

["cheney tang" <cheney tang cn gmail com>]

Hi All,
I develop a wireless network driver now, it seems that Network service is depanded on.
If no the service , the command ifconfig only says eth0 and lo.
 When the service is started, the DNS is changed wrongly.
I try to test it on Unbutu, the driver work well without Network service.
I had read the FAQ, there is no what I wanted.
Any suggestion is welcomed.

Best Regard
Cheney