in Firebox System Manager go to File > Settings. On the Traffic Monitor Tab you see a click field named "Regular expression filtering" > make sure that this is set!

example filter, that matches all ip-adressen from 192.168.23.230 to 192.168.23.249:
192.168.23.2[3-4]

see also:
https://www.watchguard.com/help/docs/help-center/en-US/Content/en-US/Fireware/proxies/general/regular_expressions_c.html

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