[Xymon] Alternative to conn test - check for any incoming data from client?

Hi there,

Quite a few of the clients I've setup to be monitored, are behind a firewall which does not allow a response to ping. As such, I can not use the conn test, a function which I do believe is rather important.

As an alternative, I would like to have a (possibly periodic) check, to see whether any data is incoming from these clients, as an alternative to the connection test.. afterall, incoming data = working connection, at least between the client at the Xymon server.

Might any one have any recommendations or perhaps a sample on how to accomplish such a feat?

Kind regards,

Joost Hillen. System Administrator Draads bv.