[Xymon] Multiple xymon clients behind same IP

[Shawn Heisey]

On 7/29/2020 9:19 AM, vadud3 at gmail.com wrote:
> I have multiple xymon clients (multiple devices at home) and the xymon 
> server is at cloud.
> 
> The outgoing IP is same for all the xymon clients. How do I monitor them?

Damien's suggestion is one way.  And I do not think it's a bad way.

What I will generally do for hosts that cannot be accessed externally is 
use 0.0.0.0 as the IP address in hosts.cfg.  I then add "noconn" and 
maybe "CLIENT:host.example.com" to the config line.  The noconn is 
because hosts behind NAT normally can't be pinged directly, and noconn 
ensures that xymon will not try to ping it and mark the host down when 
the ping fails.

If there are holes in the firewall to allow outside access, then a real 
IP address and server-side tests like "ssh" MIGHT be appropriate, but in 
most cases for firewalled hosts, those tests are not added.  The CLIENT 
section allows things to work if the xymon client reports something 
different as its hostname than what you have in hosts.cfg, which could 
happen in the wild.  I do sometimes have "http" tests on these host 
lines, because http tests are usually done with DNS lookups and don't 
try to use the 0.0.0.0 address.

Thanks,
Shawn