Weird Network Errors

Hey guys,

i started working at a new company last week and i am having strange problems. we have a network (wifi as well as ethernet, i can choose whatever i like) that i can access (including shared folders, intranet stuffs etc). what i can't however is access the internet. everyone else can (Windows computers, android devices, even another mbp running 10.5.x).
my machine: mbp early 2011 with 10.7.5.
ping, nslookup is working fine (i attached a file)

as soon as i fire up a browser and type in something (let's say google) it can't establish the connection (can't resolve hostname, like a dns error)

i have limited access to the server, but i can setup a meeting with the tech guy. if needed.
Any suggestions? More information needed?

best regards

 

i checked his proxy settings: no proxy set (all greyed out), only the standard values are set.
BTW: when i copypaste the ip directly in to the browser it works.