A-107
Chapter 6 Point-to-Point Protocol (PPP)
Remote Annex 6300 Supplement to the Remote Annex Administrator’s Guide for UNIX
Book A
Negotiating the LCP Options
The following subsections describe how the RA 6300 negotiates the LCP
options.
Maximum
Receive Unit
(MRU)
The ppp_mru parameter sets the maximum receive unit (MRU).
Acceptable values range from 64 to 1500. The RA 6300 default is 1500.
The RA 6300 informs the peer that the ppp_mru parameter is its local
Maximum Receive Unit (the largest packet it can receive).
Asynchronous
Control Character
Mask (ACCM)
The port parameter ppp_acm (asynchronous control mask) specifies
which of the first 32 bytes (0x0 to 0x1F) can be sent as clear text and
which should be protocol-escaped before being sent to the serial port.
The RA 6300 requests the ppp_acm parameter as its local mask. If the
peer NAKs ppp_acm, the RA 6300 accepts the hint if it is a superset of
the RA 6300’s mask; otherwise, it uses the PPP default of 0xFFFFFFFF.
The RA 6300 accepts any mask from the peer. Values range from
0x00000000 to 0xffffffff. The RA 6300 default is 0x00000000.
Setting the ppp_acm mask avoids sending characters that may bother the
modems or devices through which the peers are connected. For example,
if the modem uses CTRL-A (^A/0x01) as its attention character, it must
be escaped before the RA 6300 sends it.
•
ppp_acm for ASCII NUL (decimal 0) is 2 to the power of 0 =
0x00000001
•
ppp_acm for ASCII SOH (decimal 1) is 2 to the power of 1 =
0x00000002
•
ppp_acm for ASCII DC1 (decimal 17) is 2 to the power of 17 =
0x00020000
•
ppp_acm for ASCII DC3 (decimal 19) is 2 to the power of 19 =
0x00080000
Summary of Contents for 6300
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