Robuta

https://portforward.com/linksys/dd-wrt/
You can have your Linksys DD-WRT ports open right now with our simple 4 step process. It takes only 5 minutes and you're done.
dd wrtopen portlinksysrouterinstructions
https://www.dynu.com/en-GB/Forum/ViewTopic/DDNS-open-Wrt-no-Ip-update/18817
open wrtcommunity forumddnsipupdate
https://www.dynu.com/fr-FR/DynamicDNS/IPUpdateClient/OpenWrt
free dynamic dnsopen wrtservicedynu
https://portforward.com/buffalo/wzr-600dhp-dd-wrt/
Forwarding ports in the Buffalo WZR-600DHP DD-WRT is easy. All you need is 5 minutes to follow our simple 4 step guide.
open portsdd wrtbuffalorouter