well running it if they say no isn't such a good idea. i did that with ATTBI and got caught. they threw a fit and i got speakeasy DSL. 2 static IPs, rock solid connection, great tech support. $90/month (for DSL) as compared to $45/mnth for cable. you get what you pay for...
but really, if you run it on port 111 they'll never see it. so... your pretty much safe.
-Chris