User's Manual

SR808ac Cable Modem User Manual
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The “low” setting does not block any services/ports, however it does protect against
invalid packets and well known attacks. The “medium” setting will cause the firewall to
drop a packet unless it is on a specific port of allowed services, The allowed services
are listed on the same page. The “high” setting is similar to “medium”, but allows
access to even fewer services. The “off” setting allows all traffic to pass.
Block Fragmented IP packets prevents all fragmented IP packets from passing
through the firewall. Port Scan Detection detects and blocks port scan activity
originating on both the LAN and WAN. IP Flood Detection detects and blocks
packet floods originating on both the LAN and WAN. The Apply button must be
clicked in order to activate any of the checkbox items. All of these settings can be
activated on-the-fly without a CMRG reboot.
5.4.2 Filtering
Choose Firewall > Filtering to display the following page.