Overview
UPnP (Universal Plug and Play) is a set of networking protocols that simplifies network interoperability for network-enabled devices and software. In particular, this software provides some interoperability with Windows networks and some desktop software.
UPnP should only be used on a home or trusted network. Avoid using this software on office, school other other untrusted networks. To quote the author of the UPnP implementation used in ClearOS:
UPnP version 1.0 is inherently flawed. What appears to have happened is that in Microsoft's first UPnP implementation they weren't concerned with security or any advanced controls. Simply all they wanted was connectivity. So we are stuck with this for now. The UPnP server, by itself, does no security checking. If it receives a UPnP request to add a portmapping for some IP address inside the firewall, it just does it. Theoretically this could open up ports on some other system.
Installation
To install UPnP support, run the following command:
yum --enablerepo=base-extras install linuxigd
Configuration
There's not much to configure with the UPnP system. In the Webconfig system, go to the in the menu. You will be able start/stop the UPnP service and change its boot policy.
