[Xymon] conn Flapping every 2.5 minutes

[Graeme Shea]

Hi All,

I have a problem with my Xymon setup I haven't been able to get around. The
conn test for servers at the same site as the Xymon server that have simple
host name entries in bb-hosts fails about every 2.5 minutes with a "Can't
resolve IP address for 1091edudc01" error (1091edudc01 being the host name).
The other hosts at this site with FQDN work fine, as do simple host names at
other sites. These windows servers are part of a different windows domain so
I cannot add them to my local domain. A relevant entry in bbhosts is:

 

10.X.Y.21 1091EDUDC01                                 #testip

0.0.0.0 BuServ.Alfps.Internal                      # http://edupass:81

 

Things that I have tried (in order)

 

Added IP address to bb-hosts

Added "testip" to bb-hosts

Added hosts to local dns and the local domain as the search domain to Xymon
server.

Added the hostnames  to the "hosts" file on the  Xymon server

Built new server using latest Ubuntu,  Xymon and hobbitping.

Changed to use fping.

Removed IP address and "testip" from bbhosts to use the local DNS to resolve
the host names.

 

If I use a terminal to ping the problem hosts there are no failures. I ran a
ping every 30 seconds for several hours and it worked every time but conn
still kept failing. When I switched to using DNS to resolve the host name
the flapping changed to be green for 3-4.5 minutes and red for 10-15
seconds. Nearly all Xymon settings are set to the defaults.

 

The strange thing is when I built the new server using a temporary IP
address it worked for several days but when I changed it to use the same
address as the old server (so the clients can reach it) the problem occurred
on the new server. I admit this sounds like a network issue but since it
should be using the IP address supplied it should not be returning a "Can't
resolve IP address" error and ping works fine. Using  DNS to resolve the
names of the other monitored servers at this site works ok.

 

Any thoughts would be much appreciated.

 

Regards

Graeme

 

 

 

 

 

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