Zte ZXDSL-531B, User Manual

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ADSL Router User Manual
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Click on The table of default policies for various security levels to see the traffic blocked status for each setting.
The higher the security level is, the more traffic blocked for the service is.
When the firewall is disabled, it will be OK for accessing in/out Internet, and the router will support PPTP packet and
IP Sec Packet for passing through. Yet, when the firewall is enabled with choosing Low, Medium or High, your
system will follow the rule listed on the table of default policies for managing the access in/out Internet to forward
packet. If you found some software cannot work properly while enabling firewall, but can work while disabling
firewall, you have to select Advance (User define) to configure the policies manually by setting mapping protocol
(TCP, UDP) and port number. And set the Direction in Bound as Allow or Block, out Bound as Allow.