PPP API Functions

5.2.5ppp_port_init()

This function initializes the interface for each PPP unit. It is called once for each unit from prep_ppp().

Syntax

int ppp_port_init(int unit)

where:

Return value

Returns one of the following:

nonzero error code

if not successful.

Usage

Typically, this function installs the pointers to the line functions in the ppp_lines[ ] array, although this can also be done at compile time. In either case, the line functions must be set up when this function returns.

It can also set the defaults for the ppp_softc structure of the unit. These include:

default_ip This is the default IP address. IPCP can optionally set your IP address for you and it can then be overwritten by DHCP.

If you are not getting the IP address by way of IPCP and are not using DHCP, the default IP address is the operational IP address of your IP stack on this interface.

Because neither IPCP assignment nor DHCP service is universally available, it is advisable to request that the end user assign an IP address (stored in NV storage) as a fallback. This can be zeros (0.0.0.0) if a DHCP assignment is required at the end user site.

require_chap This specifies whether the user configuration requires CHAP security.

You do not generally need to change the other structure members manually.