ZyXEL NAS540 User Guide - Page 183
UPnP and the NAS's IP Address, UPnP and Security
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Chapter 9 Network Note: To use UPnP port mapping, your Internet gateway must have UPnP enabled. If your Internet gateway supports Port Address Translation (PAT is sometimes included with a port forwarding feature), you can have the Internet users use a different TCP port number from the one the NAS uses for the service. Figure 83 UPnP Port Address Translation for FTP Example 192.168.1.20 a.b.c.d TCP: 21 TCP: 2100 In the above example, the Internet gateway uses PAT to accept Internet user FTP sessions on port 2100, translate them to port 21, and forward them to the NAS. 9.5.1 UPnP and the NAS's IP Address It is recommended that the NAS use a static IP address (or a static DHCP IP address) if you will allow access to the NAS from the Internet. The UPnP-created NAT mappings keep the IP address the NAS had when you applied your settings in the UPnP Port Mapping screen. They do not automatically update if the NAS's IP address changes. Note: WAN access stops working if the NAS's IP address changes. For example, if the NAS's IP address was 192.168.1.33 when you applied the UPnP Port Mapping screen's settings and the NAS later gets a new IP address of 192.168.1.34 through DHCP, WAN access stops working because the Internet gateway still tries to forward traffic to IP address 192.168.1.33. Since you can no longer access the NAS from the WAN, you would have to access the NAS from the LAN and re-apply your UPnP Port Mapping screen settings to update the Internet gateway's UPnP port mappings. Figure 84 UPnP Using the Wrong IP Address 192.168.1.34 a.b.c.d 192.168.1.33 9.5.2 UPnP and Security UPnP's automated nature makes it easier to use than manually configuring firewall and NAT rules, but it is also less secure. Using UPnP may make your network more susceptible to snooping and hacking attacks. NAS540 User's Guide 183