User name only used from a specific IP number

[Carinus Carelse <carinus.carelse@xxxxxxxxx>]

I would like to know if it is possible to allow a username to only
authenticate from a specific IP number or a range of number.  So in
other
words i want UserA to only have internet access using his id from his
pc.
if he goes to another PC or another IP number then it must not allow him

to authenticate.

Is this possible and if so where can I get a look at a config example.

Thanks in advance for the help.

Carinus