User's Guide

TD851W 150Mbps Wireless N ADSL2+ Modem Router User Guide
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Note:
After configuration, you need to click the Save button appeared on the left panel so that your
configuration can still take effect after the Router reboots.
4.5.2 IP/Port Filter
Choose “Firewall→IP/Port Filter” menu, and you will see the next screen (shown in Figure 4-44).
Here you can set the IP/Port filter rules to secure or restrict your local network.
Figure 4-44
¾ SPI Firewall: Choose to enable or disable the SPI firewall.
¾ Rule Action: The filter mode of this entry, it can be “Permit” and “Deny”. If the mode is
“Permit”, the IP connection matches the rule will be permitted; if the mode is “Deny”, the IP
connection matches the rule will be denied.
¾ Protocol: The protocol of this entry, it can be “IP”, “ICMP”, “TCP” and “UDP”.
¾ Direction: The direction of this entry, it can be “upstream” and “Downstream”.
¾ Source IP Address / Mask Address: The source IP address and mask address of the entry.
¾ Dest IP Address / Mask Address: The destination IP address and mask address of the
entry.
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