In most cases hosts just NULL the ip (make it so it doesn't route) to protect the network. If you need actaul filtering to help out, check out staminus.net . They have some of the best filtering for the price
Please be advised though, that as of right now, you won't be getting uber speeds in download/uploading. So, if you run downloads and such off it, it won't be the best. Matt's working on getting some really nice bandwidth for everyone so they can burst their pipes, but he won't be getting that for another while.
As of right now, i can do anywhere from 60 <--> 200 KB/sec off the box. Nothing uber, but nothing terrible either.
If you talk to matt, drop him my name
You can get him on AIM at toro00 .
EDIT - Oh ya, they're also running a deal where all servers are 50% off
EDIT2 - Hmm, actually, contact me on aim at 'delta2073', i might be able to get you a little more of a deal