Thank you for your replies, it works great using the hosts file!
I thought about using the hosts file when I saw Adam's reply, but wasn't sure whether they'll need different ports/tunnels for each NATed devices (they don't seem to need separate tunnels - I've got it working with one SSH tunnel for each network).

On 13 January 2014 15:57, Tom Laermans <tom.laermans@powersource.cx> wrote:
On 01/13/2014 04:14 PM, Michiel Klaver wrote:
Bogdan Ghita wrote at 13-01-2014 15:06:
Hello

...

Is there a configuration/workaround that would allow to differentiate
between these multiple instances of what appears to be the same [local]host?

Observium connects to unique hostnames, you could add some dummy names to
your local DNS or hosts file all pointing towards 127.0.0.1 (or setup alias
ips 127.0.0.2 127.0.0.3 etc to the loopback interface and abuse them).

Indeed, the hostname is the identifier for us, so we will not support this; adding dummy hostnames works. You can also specify the SNMP port per device if you just want to portforward UDP/161 instead of running community-based a proxy.

Tom
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