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To: Mike McFarland who wrote (4054)	1/5/1999 8:35:00 AM
From: Dick Smith	Respond to of 32903

More pinging... Mike McFarland asks David Lawrence: " I used tracert and ping to check out a free ISP here in Seattle that I am test driving. Everything beyond their servers will not show up...how can this be?" This probably means they're stopping the return of the test messages used by ping and traceroute at their firewall (or their next higher provider is doing it). This might be done because (1) they're concerned about these non-data packets loading their network, (2) they're concerned that corrupted packets could crash networking stacks (this kind of attack was used to screw up SI a while back, until SI obtained a patch against it), or (3) they don't think you need to know. It's not unreasonable to ask, and see what you get. If they don't answer "Are you blocking traceroute?", the technical version of the question is "Are you blocking ICMP time-exceeded messages?" which is the technical name of the messages used by traceroute. You may have to have the first-level support people go ask the people who actually run the network. Hope this helps, Dick Smith