OSX Mavericks 10.9.1 - DNS Issue

Hello!
I'm in a mixed enviroment two Macs an two windows machines.
Currently I'm not able to ping my Mac computers with their names in my local network
and vice versa.
The name resolution doesn't seem to work. I can access without any problems the internet.
Any ideas?
greets
     -René

I resolved this issue myself. AutoCAD was the cause of my problems. Even while closed, and even after restarting, it was doing SOMETHING. So to resolve the problem I simply launched the program, and instantly everything was fixed, then closing it again was still fine.

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