MTNL Broadband wifi problem with Sony PlayStation 3

[Thedoom]

I have a modem+router 450tc1(beetel) and want to connect my ps3 online with a wireless connection. Can anyone tell me the settings like the ip adress, MTU, DNS and stuff? I talked to an MTNL guy on 1504, he told me some setting but I still randomly get disconnected from the psn.Sometimes when i get dc'ed from the psn, then I restart my modem and ps3. Most of the time I get connected to psn but it is only for a short while.Ps- A bit offtopic but I have battlefield 3 on my ps3 and I keep getting "Connection to the EA servers failed" when I play online. It is a frequent and randomly occurring error. Is the problem maybe connected to the modem setting(on 192.168.1.1) or the setting to connect online in my ps3?Pps- I talked to an EA advisor about my error in bf3, and he told me to open a number of ports. Any idea about it?Ppps- I have a dynamic IP instead of static and I read somewhere that port opening require a static IP