Remote Access - DD-WRT Wiki
https://wiki.dd-wrt.com/wiki/index.php/Remote_AccessEnable the necessary settings for remote Web or SSH access (note the WAN IP and port number), then in your main router forward that port to the WAN IP address of the Client router. [edit]Client Bridge On the primary router, forward port X to LAN IP address of the Client Bridge, where X = 22 for SSH, 23 for Telnet, 80 for HTTP, or 443 for HTTPS.