System Administration Guide: Network Services

Assigning Dynamic IP Addresses to Callers

Dynamic addressing involves the assignment to each caller of the IP address that is defined in /etc/ppp/options.ttyname. Dynamic addressing occurs on a per-serial port basis. When a call arrives over a serial line, the caller receives the IP address in the /etc/ppp/options.ttyname file for the call's serial interface.

For example, suppose a dial-in server has four serial interfaces that provide dial-up service to incoming calls:

With the previous addressing scheme, an incoming call on serial interface /dev/term/c is given the IP address for the duration of the call. After the first caller hangs up, a later call that comes in over serial interface /dev/term/c is also given the IP address

The advantages of dynamic addressing include the following: