Black Box LRA005A-R2 - Manual (Page 178)

ASYNC ROUTER AR-P, AR-5, AND SYNC ROUTER REFERENCE MANUAL
178
NOTE
If authentication fails after a config modify has been executed, make sure you verify the
config modify with a config show. If you see more than one ppp modem0 chap user xxx
yyy display for your remote interfaces with the old Router name and password, you
must manually delete them with the following commands:
ppp modem0 chap user none
ppp isdn0 chap user none
config save
ppp iface lcp {local | remote} acfc
[on | off | allow [on | off]]
Address and control field compression (ACFC)—Displays or sets the option to compress the address and
control fields of the PPP header. The default is off.
ppp iface lcp {local | remote} pfc
[on | off | allow [on | off]]
Protocol field compression (PFC)—Displays or sets the option to compress the address and control fields of
the PPP header. By default the setting is off, so that all implementations must transmit packets with two-
octet PPP protocol fields. When using low-speed links, it is desirable to conserve bandwidth and avoid
sending redundant data. PFC controls the trade-off between implementation simplicity and bandwidth
redundancy.
ppp iface lcp {local | remote} magic
[on | off |value | allow [on | off]]
Magic number - Displays or sets the initial magic number, to provide a method of detecting links in the
looped-back state and other Data Link Layer anomalies. By default the magic number is off, or not
negotiated, and zero is inserted where a magic number may otherwise be used. Choose the magic
number in the most random manner possible in order to guarantee a very high probability that it is
unique. Good ways to choose a random magic number include using machine serial numbers, network
addresses, etc. Until the magic number is successfully negotiated it must be transmitted as zero.
value Enter the value you want to be the magic number.
ppp iface lcp {local | remote} mru
[size | allow [on | off]]
Maximum receive unit (MRU)—Displays or sets the maximum receive unit (MRU), the largest packet that a
PPP peer is willing to receive. It is expressed in two octets and sent to inform the peer that the
implementation can receive larger packets.
size—The default value is 1500 octets. If smaller packets are requested, an implementation still must be
able to receive the full 1500 octet information field in case link synchronization is lost.
ppp iface lcp {local | remote} default
Default—Issuing this command verbatim resets the lcp negotiation options to their default values, as
specified by RFC1661. Default values are: