First let me tell you my configure history.
First I had NAT problems which I managed to solve and managed to host parties etc. I have ADSL modem zyxel p-660hw d1. Few days later my xbobx360 couldn't connetct my network. I've tested that network works perfectly with other devices. So after this I reseted network settings I tried again with no success. After this I reseted my ZyXel, made new network and password. I didn't do port forwarding or any other configurations because I just wanted to my xbox to connect the internet.
Now the situation is that it can't connect to network. It finds my network, accept password but that's all. Some how it doesn't find IP address (it's automatic and everything says 0.0.0.0.). DHCP settings should be in order:
|DHCP||Server None Relay|
|IP Pool Starting Address|
|Remote DHCP Server|
I've tried manual IP address as well, but it doesdn't work.
Summa Summarum: At first xbox connected to live with some restrictions (i could use internet, netflix and play online games, but no parties), then I configured NAT and it worked just fine for few days. suddenly it stopped to work and now I have this issue. All help is more than welcome!