I really need help with this.
I use SBC internet with PPPoE to get online, and share my connection over airport with OS X.
On my bro's imac, it takes it up, I have two of the ISP's major routers set for DNS data, and still, a number of sites don't work, and things like itunes radio and software update won't work.
While I don't find this a huge problem, my brother does, as he seems to take more advantage of the DSL than I do.
Any suggestions? It seems like an ICS problem, and not anything else, ideas?