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Chapter 8 Network
NSA320 User’s Guide
179
8.5.1 UPnP and the NSA’s IP Address
It is recommended that the NSA use a static IP address (or a static DHCP IP
address) if you will allow access to the NSA from the Internet. The UPnP-created
NAT mappings keep the IP address the NSA had when you applied your settings in
the UPnP Port Mapping screen. They do not automatically update if the NSA’s IP
address changes.
Note: WAN access stops working if the NSA’s IP address changes.
For example, if the NSA’s IP address was 192.168.1.33 when you applied the
UPnP Port Mapping screen’s settings and the NSA 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 NSA from the WAN, you would have to access the NSA 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
8.5.2 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.
8.5.3 The NSA’s Services and UPnP
This section introduces the NSA’s services which an Internet gateway can use
UPnP to allow access to from the Internet.
BitTorrent
BitTorrent is a distributed peer-to-peer file-sharing protocol that the NSA’s
download service can use. Using UPnP port mapping for BitTorrent lets BitTorrent
work faster.
192.168.1.34
a.b.c.d
192.168.1.33