"Hobbit polls every 30 - 45 seconds" -- really? How did you measure
this?
*From:* Josh Luthman [mailto:user-4c45a83f15cb@xymon.invalid]
*Sent:* Thursday, November 22, 2007 6:03 PM
*To:* user-ae9b8668bcde@xymon.invalid
*Subject:* Re: RE: Re: [hobbit] Hobbit CONN questions
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 <user-d970b5e56ec9@xymon.invalid> 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:user-4c45a83f15cb@xymon.invalid]
*Sent:* Wednesday, November 21, 2007 1:13 AM
*To:* user-ae9b8668bcde@xymon.invalid
*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, user-08b3b26d089f@xymon.invalid < user-08b3b26d089f@xymon.invalid > wrote:
-----Message d'origine-----
De : Henrik Stoerner [mailto: user-ce4a2c883f75@xymon.invalid]
Envoyé : vendredi 9 novembre 2007 08:23
À : user-ae9b8668bcde@xymon.invalid
Objet : Re: RE: Re: [hobbit] Hobbit CONN questions
On Fri, Nov 09, 2007 at 08:14:32AM +0100,
user-08b3b26d089f@xymon.invalid 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!
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Josh Luthman
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Those who don't understand UNIX are condemned to reinvent it, poorly.
--- Henry Spencer