Gateway none - Manual (Page 66)

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CHAPTER 4
4.3.7.7 Client Filtering
You can filter Internet access for local clients based on IP
address, application type (i.e., HTTP port), and time of day.
For example, this screen shows that clients in the address
range 192.168.2.50-99 are permanently restricted from
using FTP (Port 21), while clients in the address range
192.168.2.110-119 are blocked from browsing the Internet
from Monday through Friday.