Firewall Rule: Block all except

HI All,
is it just me, but i am looking at creating a firewall rule to block everyone except 3 or 4 specific ip addresses.

the rule is basically (assuming 1.1.1.* = a valid external ip address)

when incoming request matches
(ip.src ne 1.1.1.1) or (ip.src ne 1.1.1.2) or (ip.src ne 1.1.1.3) or (ip.src ne 1.1.1.4)
then choose option Block

You better use the “is not in” operator.

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