* Matthew Vernon <m.c.ver...@warwick.ac.uk> [Don Mai 21, 2009 at 03:41:53 +0100]:
> mtr doesn't seem to work for hosts that are on different networks. The > failure mode is that I type in an IP address (or hostname) [or specify > same on command-line], and then it just sits there - nothing appears in > the trace bit of the window at all. > It works fine with "localhost", and seems to at least work with > reasonably nearby network hosts (my machine is in bio.warwick.ac.uk, and > it works to www.warwick.ac.uk, for example, but not www.cam.ac.uk). > Putting in an IP address rather than a hostname doesn't change this > behaviour. This sounds like a problem with filtered ICMP messages. Could you please try running "ping www.cam.ac.uk" (or any other host that's known to cause problems) and then "ping -t 1 www.cam.ac.uk"? You should get something like "From [...] icmp_seq=1 Time to live exceeded" for the second case, if not your network administrators decided to block incoming replies to outbound ICMP messages (very common e.g. for defaults of Cisco hardware). regards, -mika-
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