Displaying PPP Characteristics

Field

Description

Values

Default

 

 

 

 

Magic Number*

The current magic

Disabled

Disabled

 

number.

 

 

PF Compress

Indicates if the access

Enabled

Disabled

 

server negotiates to allow

Disabled

 

 

its peer to omit the extra

 

 

 

protocol field byte from

 

 

 

packets sent over the

 

 

 

link.

 

 

ACF Compress

Indicates if the access

Enabled

Disabled

 

server negotiates to allow

Disabled

 

 

its peer to omit the

 

 

 

HDLC address and

 

 

 

control fields from

 

 

 

packets sent over the

 

 

 

link.

 

 

FCS Size*

The size of the FCS that

16-bit

16-bit

 

the access sever is

 

 

 

configured to negotiate.

 

 

Callback**

Indicates that the access

Enabled

Enabled

 

server negotiates to

Disabled

 

 

request a call-back.

 

 

Note: *This field has a fixed value in this software release.

Note: ** If you enable PPP call-back negotiation on a port, it is strongly recommended you also enable some sort of authentication (PAP, CHAP, etc.) on the port. Without authentication, any user who happens to discover the phone number for that port’s modem could potentially request a call-back and run up unlimited phone charges. To enable authentication on a port, refer to Chapter 22.

Displaying IPCP Characteristics

The SHOW/LIST/MONITOR PPP IPCP CHARACTERISTICS command displays the IPCP configuration for a given port. The fields in the display show the latest values configured by the SET PORT n PPP IPCP characteristic commands. Use the SHOW/ MONITOR PORT n PPP IPCP STATUS command to see the values actually used on the link.

Configuring and Managing Point-to-Point Protocol (PPP) Ports 19-7