-@cindex KeyExpire
-@item KeyExpire = <@var{seconds}> (3600)
-This option controls the time the encryption keys used to encrypt the data
-are valid. It is common practice to change keys at regular intervals to
-make it even harder for crackers, even though it is thought to be nearly
-impossible to crack a single key.
-
-@cindex MACExpire
-@item MACExpire = <@var{seconds}> (600)
-This option controls the amount of time MAC addresses are kept before they are removed.
-This only has effect when Mode is set to "switch".
-