Check-ping Vs. Mac address table expiration

[Paul Weaver]

A work around would be to run the check every 4 minutes -- the arp entry
won't time out then

(It takes our boxes less than a milisecond to respond to an arp, 397ms
would imply to me that something else is going on -- isdn link
reaquiring etc)
--
Paul Weaver	
Systems Development Engineer
News Production Facilities, BBC News

 

> -----Original Message-----
> From: Drew Weaver [mailto:drew.weaver at thenap.com] 
> Sent: 27 March 2009 12:25
> To: nagios-users at lists.sourceforge.net
> Subject: [Nagios-users] Check-ping Vs. Mac address table expiration
> 
> A very small number of hosts on my network serve important 
> roles but aren't always in the MAC address table of the 
> switch they're connected to. Their MAC address assignment 
> gets timed out by the default (i think its 5 minutes) because 
> no data has been sent to them in that amount of time.
> 
> For whatever reason, no matter what I do it seems like 
> check-ping always thinks there is a problem.
> 
> The response from the rarely used host looks like:
> 
> Pinging 192.168.1.8 with 32 bytes of data:
> Reply from 192.168.1.8: bytes=32 time=397ms TTL=63 Reply from 
> 192.168.1.8: bytes=32 time<1ms TTL=63 Reply from 192.168.1.8: 
> bytes=32 time<1ms TTL=63 Reply from 192.168.1.8: bytes=32 
> time<1ms TTL=63
> 
> 397ms because the switch has to do ARP, etc...
> 
> Any suggestions how I can avoid this?
> 
> So far i've tried adding -p 5 to the check-ping in hopes that 
> it would somehow use the average of the 5 pings.
> 
> thanks,
> -Drew
> 
> 
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