Wifi connection to Mac using Internet Sharing

Hi all,
I am a real novice but have spent a lot of time looking at this stuff and am completely baffled--it seems solvable though.
I am studying abroad in Europe and my dorm room comes equipped with ethernet. As part of my orientation materials I got a packet with my internet info (i.p. address range, subnet mask, router i.p., DNS servers, and search domains). Since I wasn't able to connect to the internet using DHCP I just plugged all this info in manually. This worked great, my internet is fast and reliable.
The problem comes when I try internet sharing with my iPhone; it has no problem finding the network and even connecting to it, but I can't access the internet (it just times out after a while). This problem occurs using DHCP or a static i.p. on the iPhone. My thinking is that I could get on using a static i.p. if I only knew what addresses to use.
Any ideas or pushes in the right direction would be greatly appreciated.

 

@KeepCalmPeople--Thanks a bunch, I just posted it there too.

@Mrbobb--The whole static IP thing seemed weird to me too... any idea how/where i would enter the gateway parameter if I could somehow track it down?