CORBA35 — Firewall Traversal algorithm

Summary: The description of firewall traversal in orbos/98-07-03 4.11 has some
significant unstated assumptions, and prescribes an algorithm that has
several flaws.

In orbos/98-07-03 4.11 it says: "A client will determine if it needs
to go through a firewall to make a request on the target object. If
the client is in the same domain a direct invocation can be made. The
client can determine this be examining the host address information in
the target IOR." This assumes that the enclave structure maps to host
addresses in some way known to all clients. This needs to be made more
explicit.