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* Andrew Young ([log in to unmask]) wrote: > Dear all > > For the last few years, I have set my students an assignment to use > ping/traceroute to look at routes and performance to various places on the > Internet, draw annotated maps, and reach various conclusions. They have > always found it very interesting. > > For the last year I have been fighting with various packet filters that > have been stopping me doing this. I have now reached an impasse and can't > get traceroute to work at all (I have tried ICMP, UDP or TCP based > versions). TCP being lft? (see below) > As ping still works, it seems to me that my University (or their ISP) are > filtering the "TTL Exceeded" reply. I am trying to get them to remove this, > but I need a fallback position in case they won't. Thats strange. > Does anyone have any ideas for other equivalent things I can do that aren't > so susceptible to firewall interference. Try lft http://www.mainnerve.com/lft/ have fun, SteveC [log in to unmask] http://www.fractalus.com/steve/