How to telnet devices the dude server with different network

to users of the dude, let me wish I had asked constraint is how the dude server remotely on a different IP subnet to telnet feature on the monitored devices can be used.

this link to see my topologhy network

The difficulty I experienced is if I can not use the features of the telnet client on the network A dude at The dude remotely located servers in the network B & C.

Currently I can login to the client on the network dude A dude the server to remotely installed on the network B and C. Features that can be run include ping, snmp, monitoring services and bandwidth.

please help who often uses the technology of The Dude to monitoring devices in everyday networking.

Hopefully someone can share knowledge with me. Cheers and Thanks

According to my friend, he said that I should use agents dude to do the telnet communication between several different network subnets.

Does anyone can help me to give examples of the use of agents dude?

Can somebody give me a step by step documentation. Cheers.