In <user-ab48534026e3@xymon.invalid> John <user-0309652f10a2@xymon.invalid> writes:
I'm using Xymon 4.3.0-0.beta2. I have a server with a static address listed
in bb-hosts as <static ip> <hostname>. The server was reconfigured to use
DHCP and it acquired a new, different dynamic IP. I didn't make any changes
to the bb-hosts file but xymon didn't seem to care the server's address had
changed. It began testing the host with it's new IP address like nothing was
different. Historical data is all there, no alarm was triggered. I
understand the hostname correctly resolves to the new IP but I don't
understand why xymon isn't trying to test the old static IP, and why it
didn't give some indication the address had changed. It just so happens that
I'm glad it went smooth but I expected to have to reconfigure the bb-hosts
file; specifically, to change the <static ip> field for that host to
0.0.0.0. Can anyone explain this behavior, and how to get xymon to alert if
a host with a static IP address has it's IP changed?
Very simple explanation: Xymon does a DNS lookup on the hostname to determine
the IP, and if it succeeds then it will use the DNS-provided IP - regardless
of what is in the bb-hosts file.
You can force Xymon to use the bb-hosts provided IP with the "testip"
tag on the host entry.
There is not a built-in method of checking whether the IP-address has
changed, or if the DNS-IP differs from the bb-hosts IP.
Regards,
Henrik