LevelOne WBR-6603 - Manual (Page 47)

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Outbound Filter :
To enable Outbound Packet Filter click the check box next to Enable in the Outbound Packet
Filter field.
Example 1:
(192.168.1.100-192.168.1.149) Located hosts are only allowed to send mail (port 25), receive mail
(port 110), and browse Internet (port 80); port 53 (DNS) is necessary to resolve the domain name.
(192.168.1.10-192.168.1.20) Located hosts can do everything (block nothing)
Others are all blocked.