[Network] 'mtr' tool : are these results abnormal ??

[R Kimber]

On Tue, 05 Sep 2006 11:33:23 +0100
Tony Arnold <tony.arnold at manchester.ac.uk> wrote:

> On Tue, 2006-09-05 at 11:05 +0100, Tony Arnold wrote:
> > On Tue, 2006-09-05 at 09:58 +0100, R Kimber wrote:
> > 
> > > I tried it and got 30% - 50% loss even to my router !!!!
> > > 
> > > There surely is some other explanation than an ISP-related one.
> > 
> > I did this at our University and was getting 15% packet loss to one
> > of our local routers which I know is not overloaded.
> > 
> > Our network manager ran mtr from his Mac and saw 0% loss, so I'm
> > wondering if there is a problem with the version of mtr on Ubuntu.
> 
> I'm an idiot! My firewall was stopping some of the ICMP traffic coming
> back! Turn off the firewall and the figures look much more sensible.

Yes, I get 0% at every step, except the last, to www.keele.ac.uk (25%)

MY firewall doesn't seem to do ICMP filtering.  It's a simple
firestarter setup that just blocks external broadcasts.  Is there
anything to be gained from enabling ToS filtering?  I don't really
understand these things, but there seems to be a suggestion that you
can maximise throughput.

- Richard.
-- 
Richard Kimber
http://www.psr.keele.ac.uk/