#5644 (UPNP allows redirection hijack) – DD-WRT
https://svn.dd-wrt.com/ticket/5644The upnp daemon in dd-wrt is not spec-compliant. In fact, here are the steps to reproduce the bug: Start some application that requests a specific port from Client A. Open that same application requesting the same specific port from Client B. Request from Client B will be accepted, while redirection from Client A still exists, which is wrong.
The Ultimate DD-WRT Guide - ProPrivacy.com
https://proprivacy.com/vpn/guides/dd-wrt19.07.2016 · Install DD-WRT on the router, as per the previous steps; Navigate to Setup -> Basic Setup. There, Disable your 'Connection Type', as the router will not be plugged into your main router or modem. Change the 'Router' and 'Host Name' as we showed in Setting up DD-WRT. We recommend using the same name with a '-2' appended to it.