Port_Server_Security; Ppp_Acm - Bay Networks 5390 Administering

Configuration Parameters

port_server_security

This asynchronous port parameter enables a host-based security policy for access to the port through
the port server. When enabled, only authorized users can access the port. A Y enables this parameter,
an N disables it. The default is N.

ppp_acm

This asynchronous port parameter (async control mask) specifies which of the first 32 bytes (0x0
to 0x1F) of the ASCII character can be sent as clear text and which should be protocol-escaped.
The Model 5390 server requests the ppp_acm parameter as its local mask. If the peer rejects
ppp_acm, the Model 5390 server accepts the hint if it is a superset of the Model 5390 server's
mask; otherwise, it uses the PPP default of 0xFFFFFFFF. The Model 5390 server accepts any mask
from the peer. Values range from 0x00000000 to 0xffffffff. The Model 5390 server default is
0x00000000.
The ppp_acm parameter is a bit mask that is set as follows:
• 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
Thus, the mask for XON/XOFF (DC1 and DC3) equals the OR function of 0x00020000 and
0x00080000, or 0x000a0000.
When the Model 5390 server sends an ACCM to the host, it follows this calculation to determine
the initial value requested:
• The value set for ppp_acm (a 32-bit integer) is read in as the ACCM.
• If input_flow_control is set to start/stop, the following two additions are made:
If input_start_char is 0–31 decimal, the bit indexed by this parameter is set in the ACCM.
If input_stop_char is 0–31 decimal, the bit indexed by this parameter is set in the ACCM.
• If output_flow_control is set to start/stop, the following two additions are made:
If output_start_char is 0–31 decimal, the bit indexed by this parameter is set in the ACCM.
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