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LCS60 Configuration and Connection for PPP Service
Reserved IP Address
The user requests a reserved IP address by omitting the -D option on his/her
data switch dialstring and by having a negotiable IP address administered in
his/her client software package. The reserved IP address must be centrally
administered by the LCS60 administrator prior to the user’s call. To find that
user’s reserved IP address, the LCS60 searches its configuration database with
both the IP network security group name and the user ID field. The latter value
is extracted from the -u option appended to the data switch dialstring by the
NAC. In the absence of a NAC or an explicit -u option, the user ID defaults to
the value guest. If the LCS60 does not find a reserved IP address for the given
combination of the IP network and user ID, then the session start up request is
assigned a dynamic IP address.
If the reserved IP address is allocated when a second session setup attempt is
made for the same user ID, the call is refused and an entry is placed in the ppp.log
file. A given user ID can have multiple reserved IP addresses, one for each of the
IP network security groups that has been configured on the LCS60.
Note: Reserved IP addresses can only be allocated by the system administrator
or someone with root permissions.
To reserve specific addresses for users:
Use the ipas command (Screen 4-2)
Select option 2 to display the RESERVED IP ADDRESSES FOR SLIP
AND PPP SERVICES menu
Select option 1 from this menu.
This will prompt for the login ID, group, and address as shown in Screen 4-2. If
you are using a NAC, the User Login Id is the NAC ID, otherwise, enter your
own unique login ID. In the example in Screen 4-2, user tbaker is assigned the
address 154.12.23.7 in the group morse.
To request the reserved IP address allocated for your PC or Mac by the LCS60
administrator, enter zero for the client package’s IP address and omit the -D
option from the data switch dialstring. The PPP software will then receive this
address during IP negotiation with the LCS60 PPP server.
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