I just made a sysupgrade to openwrt version 21.02.2 on my Netgear Nighthawk X4S R7800 and after successfully upgrading and restoring the configs backup all connected clients can’t resolve domain names anymore. When I do a ping to openwrt.org on the router itself everything works just fine, but when I do the same on a connected client I get “unknown host”. But when I try a ping to 1.1.1.1 on the same client everything works just fine. It worked right before the sysupgrade with version 19 of openwrt.
Thanks in advance for any help on this!