Ref: 10630011
Title: GS/X.25-IP Access Control
Date: 3/11/91

Copyright 3Com Corporation, 1991.  All rights reserved.

The need to provide increased security for the GS/X.25-IP has resulted in
the introduction of a means for "access control."  Access control offers
the Network Manager the ability to limit access to the GS/X.25-IP to users
calling from a previously defined "Valid Calling Address" (X.25 address).

An incoming X.25 call indication's calling address is compared to a list of
previously defined X.25 addresses.  The Network Manager can define up to 20
valid X.25 addresses for each line.  The list can be as broad or as
restrictive as required.  If the Network Manager wishes to limit access to
calls from a specific X.25 address, then that address is defined in the
list.  If a broader set of addresses is desired, addresses may be defined as
"1234x678X"--thus the calling address "123406781" would be allowed access.
Note:  the length of the incoming call must match the length of the defined
address.

The Network Manager can also define valid addresses followed by a "*" to
indicate that the calling address is not required to have digits where the
asterisks are.  For example, if the address is defined as " 123456***", the
calling address "12345655" would be allowed access.  In this case, the length
of the incoming call may not match the length of the defined address.

If access control is not desired, the list of addresses should be
left empty.

The command to define a Valid Calling Address is as follows:

 "Setdefault Line <line#>
            ValidCallingAddress = { 0 - 999999999999999 | ALL}"

The range of valid characters is from 0 - 99999999999999 and/or
the wildcard values "x","X", or "*".  If "ALL" is specified, the
full table is cleared.
