AX issues

[juju1up]

hello all.

i don't even know how to explain my sit., but here goes it...

so my macbook connects on to my network, but cannot access the internet. airport says that the IP address is wrong even i set it to DHCP auto.

it seems that only one of my two comps is "allowed online."

i know that i need to change my connection sharing setting, to share public ip address. after i change it to that none of computers can go online.

i'm pretty desperate by now lol, can u please help me?

thanks a mil.