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Function xn_lcp_want_option

Sets or resets LCP negotiation for various options.

int xn_lcp_want_option(int  iface_no, 
                       int  host, 
                       int  option, 
                       int  turn_on);

Parameters

iface_no

Interface number returned by xn_attach.

host

Set negotiation flag for local or remote host (LOCAL_HOST or REMOTE_HOST).

option

Option to negotiate; LCP_ACFC, LCP_MAGIC (off only), LCP_PFC, LCP_ACCM (off only), LCP_MRU (off only).

turn_on

Turn option on if TRUE, otherwise, turn it off.

return value

Returns 0 if successful, otherwise SOCKET_ERROR. If an error occurred, call xn_getlasterror and xn_geterror_string to return the error value. Section Error Codes further describes each error.

Possible values for this function are:

This function establishes whether to request the following LCP options: Address-and-Control-Field-Compression, Protocol-Field-Compression and Magic Number.

Call this function with the appropriate option number, turn_on set to TRUE and host set to LOCAL_HOST to request Address-and-Control-Field-Compression or Protocol-Field-Compression options. The option will be requested in the Configuration-Request message sent to the remote host. The option will be dropped if it is rejected by the remote host.

Call this function with the appropriate option number, turn_on set to TRUE and host set to REMOTE_HOST to suggest an option (Address-and-Control-Field-Compression or Protocol-Field-Compression) if it is not requested by the remote host. The option will be suggested in a Configuration-Nak sent to the remote host.

The option will be dropped after 10 retries if the Configuration-Requests received in response to the Configuration-NAK does not contain the option.

The default value is to not to request the option.

PPP

Function xn_lcp_want_mru

Function xn_lcp_want_pap