* 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
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.
> Does anyone have any ideas for other equivalent things I can do that aren't
> so susceptible to firewall interference.
SteveC [log in to unmask] http://www.fractalus.com/steve/