Figure 1. How ShareWay IP works
The ShareWay IP Gateway only implements a very small part of the AppleTalk Filing Protocol (AFP). For the most part, ShareWay IP simply translates the underlying AppleTalk protocols used by most AFP servers into TCP/IP, the protocols used on the Internet. In technical terms, the gateway translates ASP (AppleTalk Session Protocol) over AppleTalk to Apple's Data Stream Interface (DSI) over TCP/IP and vice versa. See Figure 1 below. DSI was introduced with AppleShare IP 5.0. For more information on DSI, refer to AFP 2.2 Specification, Apple Computer.
Like AppleShare IP, ShareWay IP uses TCP port number 548 to communicate with AppleShare Client 3.7. If your network has a firewall between ShareWay IP and the Internet, and you wish ShareWay IP to be accessible from the Internet, remember to allow access to port 548 through that firewall.
Figure 1. How ShareWay IP works
If ShareWay IP and the server are on the same Macintosh, the indicated communication between ShareWay IP and the server over AppleTalk is internal to the machine on which they are installed. This is always the case with ShareWay IP Personal.
In addition to translating between AppleTalk and TCP/IP protocols, ShareWay IP also mimics other aspects of AFP servers. For instance, if it detects a loss of connectivity with either the client or the server, ShareWay IP will wait two minutes before terminating the session with the other end.
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