Interface

Specifies an interface to bind this socket to. By default, this socket will send and receive on all active interfaces and be affected by the IPRoute() instruction. If non-zero (this socket is bound to an interface), this socket will not be affected by IPRoute.

Value	Description
0	Default behavior
1	Internal Ethernet.
2	CS I/O Interface(1) (NL201 by default)
3	CS I/O Interface(2) (NL241 by default)
4	Internal Wi-F
5	PPP

Type: Constant or Variable of type Long