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A brief introduction to RFC 1086
![[A computer connected to a bridge implementing RFC 1086; there are three connections for incoming data, outgoing data, and a control connection]](router.png)
A router implementing RFC 1086 acts as a bridge between TCP and X.25- There are three connections between the computer and the router
- One from the computer to the router on a fixed port
- This is to establish outbound connections
- Outbound data is also sent over this connection
- Another from the computer to the router on the same port
- This is to establish inbound connections
- The computer tells the router on which IP address and TCP port it is listening
- This is also a "heartbeat" connection
- When the computer closes this connection, the router will stop listening on its X.25 interface
- And one from the router to the computer
- When the router receives an inbound X.25 connection, it opens this TCP connection
- It passes any incoming data over this connection
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