How to allocate IPv6 to devices connected to a downstream router running OpenWRT?

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@Yatch Where should I change the DNS for it? My problem is that the devices themselves, fetch an IPv6 address , it works as it should for some time, but after a while that client just drops IPv6 and loses connectivity over IPv6. Reconnecting does fix the issue but the cycle continues again. How would changing DNS fix that?
 
@HC1337 im not having such issues now. Can you tell, how much time it takes to lose ipv6 on devices?
 
I can't really pinpoint it, it seems random, the device just loses IPv6, it didn't use to happen while on stock firmware. That's why I had a switch and had both the connections coming in through the WAN port.
 
I don't know if this would help, but here is my setup on OpenWRT.

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On my Mac I sometimes have problem with IPv6, in that case in LAN section (last image) I select server mode in RA service> Save and apply> then again relay mode> save and apply.

To change the IPV6 DNS address, in RA Service select hybrid mode enter 2606:4700:4700::1111 and 2606:4700:4700::1001.

I set DNS on my individual devices, to I don't use openWRT for alternate DNS.

@HC1337
 
I have the same setup, except for IPv4 I use PPPoE on Railwire. This works fine but after a while (I would assume when the lease time is over) IPv6 just disappears or doesn't work, it works initially but after a while it stops working. Reconnecting fixes it though, I'm not so sure what might the problem be here.
 
Any chances of bricking? As the model is different (although same chipsets and components it seems). Archer C6U v1 (EU) right?

Also, flash the sysupgrade firmware or factory firmware?
 
Might brick, might not. If it bricks, you go to network adapter and configure ipv4 address as 192.168.0.66, subnet mask as 255.255.255.0 and default gateway as 192.168.0.1 and flash any openwrt firmware for your device. It will unbrick.
 
But which file to flash though?

Install, upgrade, snapshot or snapshot upgrade?
 
the one you are on now, or any will work. For me factory, snapshot as well as sysupgrade worked.
 
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