[hobbit] Hobbit CONN questions

[Josh Luthman]

ARP can't be the problem - ARP will cache the result for 2 minutes and clear
it if unused.  If the result is used and is valid again within the 2
minutes, it is cached for 10 minutes.  Hobbit polls every 30-45 seconds so
ARP is not a problem.

Having switch from using hobbitping to fping I think the graphs are going to
look far superior now.  Things on the same switch are no longer 30ms but 1ms
=)

I now understand why there are warnings not to use hobbitping, but I don't
understand how the command line is getting such normal results while the
graphs are getting such high results.  Does anyone know why this is?

Josh

On 11/22/07, Hubbard, Greg L <greg.hubbard at eds.com> wrote:
>
>  Don't forget the ARP protocol -- if a destination is not in the local
> system's ARP cache, the lower layer code in the IP stack discards the first
> packet and generates an ARP broadcast.  The assumption (I guess) is that the
> discarded packet will be retransmitted.  You might look for the "knobs" on
> fping to control timeouts and retry counts.
>
> GLH
>
>  ------------------------------
> *From:* Josh Luthman [mailto:josh at imaginenetworksllc.com]
> *Sent:* Wednesday, November 21, 2007 1:13 AM
> *To:* hobbit at hswn.dk
> *Subject:* Re: RE: Re: [hobbit] Hobbit CONN questions
>
> Concerning fping options, I have some RRD graphs that show enormous pings
> to some of our customer's (upwards of 800ms) because as the radio doesn't
> pass any traffic it sits there and when someone first looks for it, it acts
> kind of dumb.
>
> What delegates how often the FPING command is issued?  I'm not looking for
> the arguments for fping itself, but rather how hobbitd kicks fping into
> gear.
>
> I would like to increase the rate of the pings and see if that helps.  I'm
> running a continuous ping over night to see if that changes the graph or if
> it really does spike to that outrageous height.
>
> Josh
>
> On 11/9/07, johan.boye at latecoere.fr <johan.boye at latecoere.fr > wrote:
> >
> > > -----Message d'origine-----
> > > De : Henrik Stoerner [mailto: henrik at hswn.dk]
> > > Envoyé : vendredi 9 novembre 2007 08:23
> > > À : hobbit at hswn.dk
> > > Objet : Re: RE: Re: [hobbit] Hobbit CONN questions
> > >
> > > On Fri, Nov 09, 2007 at 08:14:32AM +0100,
> > > johan.boye at latecoere.fr wrote:
> > > > I'm just wondering what triggers in the Hobbit code is used
> > > to make a RED ping status :
> > > >   - after just one no echo-reply each 5min ?
> > > >   - after a couple of no echo-reply ? How much ?
> > > >   - What is the timeout used to declare the host unreachable ?
> > >
> > > It goes red when the ping utility that is used (fping or hobbitping)
> > > says that the host did not respond. How many pings are sent
> > > and what the
> > > timeouts are is decided by the ping tool; see their man-pages for
> > > details. You can tune this through commandline options for the ping
> > > tool, these go into the FPINGCMD setting in hobbitserver.cfg
> > >
> > >
> > > Henrik
> >
> > Got it, options must be put in the hobbitserver.cfg . Thanks for the
> > info!
> >
> > "Les informations contenues dans ce message électronique peuvent être de
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> >
> >
> >
>
>
> --
> Josh Luthman
> Office: 937-552-2340
> Direct: 937-552-2343
> 1100 Wayne St
> Suite 1337
> Troy, OH 45373
>
> Those who don't understand UNIX are condemned to reinvent it, poorly.
> --- Henry Spencer
>
>


-- 
Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
Suite 1337
Troy, OH 45373

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