there's a printer (Brother MFC-L2700DW) that I had running in my home wifi. Then I set up IPv6 as well. Now the printer is not getting an IPv4 via DHCP. Well, it now has some default IP after a timeout. Statically setting the printer's IP doesn't work either.
In LUCI I can see its MAC address in the wireless menu (under "Associated Stations"). Apparently it also has a link-local (fe80:...) IPv6 but no IPv4 or any other address.
At least I suspect that IPv6 is causing some trouble on the printers side, since I can't remember touching anything else.
On the other hand: I disabled IPv6 on the LAN interface again and it's still not working. (Is it enough to disable "IPv6 assignment length" )
I also disabled the 5 GHz wifi because I read somewhere that Brother printers had some trouble with these too. That didn't help either.
Do you have any ideas how to debug this or did you have a similar issue?
Thanks in advance!