You can't hide that... if they run a tracert to themselves will will be able to find out what ISP they are on... I don't reccomend doing that by the way, you may want to check with the terms of service at your ISP's website. I doubt they allow this and think the person you spoke with on the phone just didn't know what they were talking about... you shouldn't do this anyway, your connection doesn't appear to be fast enough anyway, judging from the scores I have on you in the database... sharing this connection is going to hurt your performance