[nos-bbs] hop irregularity

Barry k2mf at ptd.net
Thu Sep 18 18:12:19 EDT 2008

[Maiko Langelaar / VE4KLM wrote]:

On Thu, 18 Sep 2008 15:44:47 -0500 (CDT), Skip wrote:
> Skip wrote :
> > I found quite a number of "hop check" traces to end with "!H" error
> > messages prior to reaching the target host.  I'd accept this error
> > normally, but I also found some of these paths showing errors from hop
> > check to be OK for "ping" ...
> Read this :
>    http://www.ale.org/archive/ale/ale-2003-03/msg00279.html
> It is just one of several articles you can find on the internet.
> Do a google search for the following :
>    can ping but not traceroute
> This is expected behavior when using ping and traceroute (tracert) ...
> Maiko Langelaar / VE4KLM

Excellent pointer and explanation, Maiko!  But one thing bothered me
where Jason said:

> You can try telling traceroute to use ICMP ECHO packets by using the
> -I switch.  You might have more luck that way.

I think somebody (it might as well be me) needs to say right here and
now that JNOS does not have an ICMP traceroute (hop check) built in.
Otherwise, I can easily anticipate that somebody will eventually write
back to the mailing list and say, "I tried -I switch and it doesn't
work for me."

Anyone who wants a -I switch to the 'hop check' command to make it
traceroute using ICMP please feel free to add it!  It would be kinda
cool, actually.  :)

k2mf at ptd.net

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