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Determining IP Subnet in Login Script

Articles and Tips: tip

Paul Thompson
Novell, Inc.

01 Apr 2002


It is often useful to have the ability to check the network address of a user in the login script in order to avoid running commands that should not be used over a slow link. You should use this capability if you dial into the network via NIAS / NetWare Connect, or if you come into the network via a VPN connection.

The difficulty comes in pure IP logins, where you do not have an IPX network number. The IP address of the client is provided by the NETWORK_ADDRESS variable, but it is coverted to hexadecimal.

You can still use a pair of IF statements to determine if the client's network address is outside your internal network and branch, as shown in the following example. To check for a subnet of 192.168.0.X, you would use the statement:

IF %NETWORK_ADDRESS > "C0A80000" AND %NETWORK_ADDRESS < "C0A800FF"

This will find any IP address between 192.168.0.1 and 192.168.0.254. You can do the same thing with other IP subnets by converting each octet into a hexadecimal number (192 = C0, 168 = A8, etc). To get a bit fancier and look for both an IPX network number or an IP subnet, do the following:

IF %NETWORK_ADDRESS = "BADFACE" or (%NETWORK_ADDRESS > "C0A80000" AND
%NETWORK_ADDRESS < "C0A800FF")

This will find any machines logging in from an IPX segment of BADFACE or from an IP subnet of 192.168.0.X.

* Originally published in Novell AppNotes


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