ZyXEL Communications nsa325 业主指南

Chapter 9 Network

Media Server User’s Guide

the NSA from the LAN and re-apply your UPnP Port Mapping screen settings to update the 
Internet gateway’s UPnP port mappings. 

Figure 97   UPnP Using the Wrong IP Address

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.

This section introduces the NSA’s services which an Internet gateway can use UPnP to allow access 
to from the Internet. 

Common Internet File System (CIFS) is a standard protocol supported by most operating systems 
in order to share files across the network. Using UPnP port mapping for CIFS allows users to 
connect from the Internet and use programs like Windows Explorer to access the NSA’s shares to 
copy files from the NSA, delete files on the NSA, or upload files to the NSA from the Internet. 

If you configure UPnP port mapping to allow CIFS access from the WAN but cannot get it to work, 
you may also have to configure the Internet gateway to also allow NetBIOS traffic. See 

 for more on CIFS.

File Transfer Protocol is a standard file transfer service used on the Internet. Using UPnP port 
mapping for FTP allows remote users to use FTP from the Internet to access the NSA’s shares. A 
user with read and write access to a share can copy files from the share, delete files from the share, 
or upload files to the share. See 

 for more on FTP. If you use UPnP to allow 

FTP access from the WAN, you may want to use a different WAN port number (instead of the default 
of port 21) to make it more secure. Remember to tell the remote users to use the custom port 
number when using FTP to access the NSA.

You can use UPnP port mapping to allow access to the NSA’s management screens. If you use UPnP 
to allow web configurator access from the WAN, you may want to use a different WAN port number