The DMT Message Tunnel provides a path for messages to travel between processes connected to two disjoint networks. Tunnel processes usually reside on gateway nodes with connections to both the source and destination networks. The Tunnel is closely associated with the name server. covering the gateway node. WHen a request is received by the name server for a target address that is not reachable by the requesting process, the name server searches its list of tunnels for one that connects the requester's network to the target network. If an appropriate tunnel is found, the name server returns the tunnel's server port address and a gives the index of the target process entry as a process ID. When the tunnel receives a message to be routed, it requests the target address from the name server (with an IDget request). It then records the reply address and forwards the message to the target port. When a reply is received, the message is resent to the original requestor.

Author:

J. Zweizig

Version:

1.0; Modified July 22, 2002