[Gllug] OT: Traceroute

[Shevek]

It isn't continuing with "another route". It's just that it can't get any 
ICMP packets from that hop. This is more common than it ought to be.

Usually this means that some brain damaged sysadmin has decided that ICMP 
is a "security issue" and has blocked it, so traceroute doesn't work. Try 
a TCP based traceroute instead.

Recommend Stevens TCP/IP volume 1.

S.

On 18 Mar 2003, Ian Baillie wrote:

> Thanks to both of you.  It did actually reach 30 hops :-(
> 
> Strange though, because I can pick up my mail, so it is reaching the
> mail server...
> 
> Can anyone explain this?
> 
> 
> Ian
> 
> 
> 
> On Tue, 2003-03-18 at 13:00, Andrew Halliwell wrote:
> > And verily, didst Ian Baillie announce to the hordes:
> > > 
> > > I occasionally have problems with users sending and receiving mail, (on
> > > a Mac network).  I collect my mail using Evolution (as I am playing with
> > > Suse on my laptop) and ran a trace route to see how many hops it took to
> > > get to the mail server (external mail server).
> > > 
> > > After 11 hops it came up * * *
> > > 
> > > What does this mean?  Is the host unreachable?
> > 
> > Not neccecelery...
> > It just means that hop is unreachable. It usually continues after that with
> > another attempted route.
> > 
> > Only when you get a long line of those that go all the way up to 30 hops, or
> > you get an explicit "host unreachable" is it considered down or isolated.
> > 
> > -- 
> > Gllug mailing list  -  Gllug at linux.co.uk
> > http://list.ftech.net/mailman/listinfo/gllug
> 
> 
> 
> 

-- 
Shevek                                    http://www.anarres.org/
I am the Borg.                         http://design.anarres.org/


-- 
Gllug mailing list  -  Gllug at linux.co.uk
http://list.ftech.net/mailman/listinfo/gllug