Odd DNS issue for Live

[Laurin d'Volts <email.port25@gmail.com>]

I had to setup the DNS in System>Administration>Network.
I don't know why that is. I set it to my router's IP address.

Situation:

1. Connect to wireless router with wireless USB
2. ping yahoo.com
3. no response: Try IP of yahoo -- Success
4. Go to System>Administration>Network
5. Enter router's IP address as DNS server: Accept
6. ping yahoo.com
7. Success
8. Visit yahoo.com
9. Success


I don't remember having to do this for an installed debian lenny system.
Is there a reason I had to set this up on live?