DNS adress

[Piero <ludovico.ariosto@wanadoo.fr>]

I istalled a dhcp client (dhclient3) in order to let my computer 
interact with a router-switch (Netgear RP614) that contains a dhcp server.

The output of "ifconfig eth0" is:

eth0      Link encap:Ethernet  HWaddr 00:05:5D:AA:3B:E0
          inet addr:192.168.0.3  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3 errors:0 dropped:0 overruns:0 frame:0
          TX packets:22 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:472 (472.0 b)  TX bytes:2827 (2.7 KiB)
          Interrupt:11 Base address:0xb800

This seems in order with the instructions from Netgear. Nevertheless, 
when I try to reach any Internet site, I get an answer (helas I didn't 
write it down) that lets me think that its name cannot be resolved. In 
effect, I didn't give any piece of information concerning a DNS server.

Do I have to put it in /etc/resolv.conf ?

If yes, which address do I have to write there, the default gateway of 
the Netgear box (192.168.0.1), or an address given by my ISP?

Do I have to put somewhere the address of the default gateway?

Thanks,
Piero.