Introduction—Firewalls—SOCKS—HTTP tunnelling—Firewalls and RMI—GIOP Proxies—A note on callbacks—A note on firewalls
This chapter describes the implications of deploying RMI over the Internet, or over large intranets containing firewalls.  If you intend to develop applications which are to be deployed across such networks, you must read this chapter.
In our discussions of networks so far we have omitted the topic of firewalls. We have implicitly assumed only the existence of a TCP/IP local area network (LAN).
From one point of view, the Internet is nothing but an extremely large TCP/IP wide area network (WAN). However, making the jump from a LAN to the Internet is not a trivial exercise. There are ...