wired resolves dns but wireless dont

Question

My wireless won't resolve dns but my wired connection does.

I've tried:

$ sudo /etc/init.d/networking restart 

and:

$ sudo dhclient -r
$ sudo dhclient 

as I saw at that question. But it didn't solved. Any thoughts on what might been happening or which logs I gotta see to know why is it not solving dns?

sorry about the question like this, but I'm really newbie at ubuntu.

When I try to sudo nmap -sP 192.168.1.1-254 I can see my wired connection and the modem itself but I can't see my wireless connection.

$ sudo nmap -sP 192.168.1.1-254

Starting Nmap 5.21 ( http://nmap.org ) at 2012-06-29 16:21 BRT
Nmap scan report for 192.168.1.1  <-- modem
Host is up (0.0027s latency).
MAC Address: 7C:4F:B5:88:C3:DE (Unknown)
Nmap scan report for 192.168.1.135  <-- wired connection
Host is up.
Nmap done: 254 IP addresses (2 hosts up) scanned in 4.55 seconds

Answer 1

Open a terminal

Type

gksu gedit /etc/resolv.conf

And add these lines after

nameserver 127.0.0.1

nameserver 4.2.2.1
nameserver 151.197.0.38
nameserver 67.138.54.100

Save the file and close the editor. Then type

sudo /etc/init.d/networking restart

Now ping to test your connection

ping -c 10 askubuntu.com

Now it should work. Flush DNS cache by typing

sudo aptitude install nscd
sudo /etc/init.d/nscd restart
sudo reboot