Heads up...only after checking their documentation that this does not interfere with Proton's own DNS. I use a different VPN provider and they specifically advise not to use a 'custom DNS' in conjunction with their own as it is not supported with their own end-to-end solution.
No it was a linksys issue. But honestly I just replaced it was an Asus router and called it a day. It's a nice concept and works well for some people's use cases. It's not difficult to implement but to me wasn't justified.
One of the linksys routers that was advertised to support it, but the radio firmware was not officially supported and I had a lot of wireless connection issues so I replaced it.
DD-WRT has a license agreement and NDA in place with Broadcom that allow usage of better, proprietary, closed source wireless drivers (binary blobs) which they are not allowed to redistribute freely.
Broadcom has not released any FOSS drivers. Broadcom doesn’t support open-source much at all.
Basically bcm doesn't want people to use opensource.