[hobbit] Re: Conn test problems

[Josh Luthman]

Oh I see about the 30 hop default (that is every distro I've ever seen and
Windows).

I was thinking about something else, never mind then.

On 1/14/08, Hobbit User in Richmond <hobbit at epperson.homelinux.net> wrote:
>
> The question was "But, I don't understand, how the traceroute works when
> the host is up, but when the host is down it times out???" and remarked on
> the 30 lines of output in a time out situation.
>
> Although I cited Fedora 8 as the page I was quoting, the traceroute
> documentation for most any modern distro contains the explanation about
> the 30-hop default and the behavior when the tracerouted host is not
> reached.  Sorry if I wasn't clear.
>
> On Mon, January 14, 2008 13:19, Josh Luthman wrote:
> > Then I don't see how the FC8 traceroute documentation would be relevant,
> > as Michael stated that he can do one from the shell but errors out in
> > Hobbit.
> >
> > Am I missing something here?
> >
> > On 1/14/08, Hobbit User in Richmond <hobbit at epperson.homelinux.net>
> > wrote:
> >>
> >> Presumably.
> >>
> >> On Mon, January 14, 2008 12:40, Josh Luthman wrote:
> >>> Wouldn't the traceroute used by Hobbit be the same command as the
> >> shell?
> >>>
> >>> On 1/14/08, Hobbit User in Richmond <hobbit at epperson.homelinux.net>
> >>> wrote:
> >>>>
> >>>> Actually, ICMP echo-request and echo-reply packets are almost
> >> certainly
> >>>> not an issue here, nor is packet-filtering/firewalling.  In current
> >>>>  implementations, traceroute by default uses UDP packets to
> >>>> abitrary
> >> and
> >>>> unlikely-to-respond ports, varying the TTL and using the ICMP type
> >> 11
> >>>> (Time Exceeded) from hops along the way to map the routing path.
> >>>>
> >>>> The manpage in Fedora 8 says "We start our probes with a ttl of one
> >>>>
> >> and
> >>>> increase by one until we...got to the "host", or hit a max (which
> >>>> defaults to  30  hops)".
> >>>>
> >>>> So, the behavior you're seeing is as documented.  If a firewall
> >>>> were
> >> an
> >>>> issue in sending/receiving the packets used by traceroute, you'd
> >>>> see the 30-hop behavior whether the host was up or down.
> >>>>
> >>>> On Mon, January 14, 2008 11:17, Michael A. Price wrote:
> >>>>> Josh,
> >>>>>
> >>>>>
> >>>>>
> >>>>> Thanks for helping... The source/destination is on a closed
> >>>>> network, sorry...and I don't own the router...
> >>>>>
> >>>>>
> >>>>>
> >>>>> But, I don't understand, how the traceroute works when the host
> >>>>> is up, but when the host is down it times out???
> >>>>>
> >>>>>
> >>>>>
> >>>>> If it works when the host is up, then you would think the ACL on
> >>%
>
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>
>
>


-- 
Josh Luthman
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Those who don't understand UNIX are condemned to reinvent it, poorly.
--- Henry Spencer
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