If two or more rules are set, the priority of implementation from high to low is Virtual Servers, Port Triggering, UPNP and DMZ. TP-Link modem router includes four forwarding rules. The modem router can use a forwarding feature to remove the isolation of NAT and allow external internet hosts to intuitively communicate with the devices in the local network, thus enabling some special features. However, it also brings about the problem that external host cannot initiatively communicate with the specified device in the local network. Modem router’s NAT (Network Address Translation) feature makes the devices in the LAN use the same public IP address to communicate in the internet, which protects the local network by hiding IP addresses of the devices.
Back up and Restore Configuration Settings. Chapter 13 Specify Your Network Settings. Use IPSec VPN to Access Your Home Network. Make Xbox Online Games Run Smoothly by UPnP. Make Applications Free from Port Restriction by DMZ. Open Ports Dynamically by Port Triggering. 
Share Local Resources over the Internet by Virtual Server. Manage the Router via TP-Link Tether App. Chapter 1 Get to Know Your Modem Router. ALG solves this problem at the application layer by replacing the internal IP with the address of the NAT interface. FTP port commands use IP addresses that are configured on endpoint interfaces, which in the case of a host behind a NAT firewall is usually unreachable from the Internet. In this case, the endpoints do not always realize that their addresses are being translated midstream. Once the session is complete, the gateway closes immediately.įTP ALG also handles the special case when an FTP session passes through a NAT interface. ALG dynamically opens a specific combination of source and destination IP ports in the firewall policy that allows a session to be established. Because these data channels can connect to any port, it is almost impossible to create a static firewall policy that allows these data channels and still provide adequate protection.įTP ALG automatically solves this problem by monitoring the FTP command channel, looking for FTP port commands that indicate which source and destination ports are being requested.
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