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).
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.
Does anyone have any ideas for other equivalent things I can do that aren't
so susceptible to firewall interference.
Andrew Young Work: [log in to unmask]
School of Computing, Science and Engineering Tel: 0161 295 5257
University of Salford Fax: 0870 056 2359
Manchester M5 4WT