Bug#529793: mtr: only works for hosts on local network

[Michael Prokop]

* 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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Bug#529793: mtr: only works for hosts on local network

[Matthew Vernon]

Package: mtr
Version: 0.73-1
Severity: important

Hi,

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.

Regards,

Matthew

-- System Information:
Debian Release: 5.0.1
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.20-2-macpro-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages mtr depends on:
ii  libatk1.0-0 1.22.0-1 The ATK accessibility toolkit
ii  libc6   2.7-18   GNU C Library: Shared libraries
ii  libcairo2   1.6.4-7  The Cairo 2D vector graphics libra
ii  libglib2.0-02.16.6-1+lenny1  The GLib library of C routines
ii  libgtk2.0-0 2.12.12-1~lenny1 The GTK+ graphical user interface 
ii  libncurses5 5.7+20081213-1   shared libraries for terminal hand
ii  libpango1.0-0   1.20.5-3+lenny1  Layout and rendering of internatio

mtr recommends no packages.

mtr suggests no packages.

-- no debconf information



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