This is a test NAT type of gadget, generally not much use, only gamers may need to test what your network NAT type yes. NAT type generally divided into the following four:
1. Full Cone NAT (full cone)
2. Tel Restricted Cone the NAT (address limit tapered)
3. Port Tel Restricted Cone the NAT (port restrictions cone)
4. the Symmetric the NAT (symmetric)
In general, the first Full Cone NAT type is used up the cat out of the direct dial test, this time with PSV and other online no problem. With dial-up router may show a third Port Restricted Cone NAT, this needs its own test.
Download: https://redhat.ctfile.com/fs/13152-300060414