How to manually setting Br-LAN ipv6 default gateway to my router?

Unlike Ipv4, the Ipv6 gateway setting isn't an option in the LAN setting interface, I found my Br-LAN downstream devices use the link-local related address to be ipv6 default gateway, how do I set the ipv6 default gateway to be my router for br-lan downstream devices?

Connection-specific DNS Suffix: lan
Description: Intel(R) Wi-Fi 6E AX210 160MHz
Physical Address: 
DHCP Enabled: Yes
IPv4 Address:
IPv4 Subnet Mask:
Lease Obtained: Sunday, March 20, 2022 5:30:41 PM
Lease Expires: Wednesday, March 23, 2022 7:59:43 PM
IPv4 Default Gateway:
IPv4 DHCP Server:
IPv4 DNS Server:
IPv4 WINS Server: 
NetBIOS over Tcpip Enabled: Yes
IPv6 Address: 240e:390:802:3ae0::a9f
Lease Obtained: Tuesday, March 22, 2022 4:35:19 PM
Lease Expires: Wednesday, March 23, 2022 10:35:19 PM, 240e:390:802:3ae0:8567:b821:4f24:77c0
Temporary IPv6 Address: 240e:390:802:3ae0:1d62:7e16:f8de:f47e
Temporary IPv6 Address: 240e:390:802:3ae0:e418:b1ca:4702:15fe
Link-local IPv6 Address: fe80::8567:b821:4f24:77c0%23
IPv6 Default Gateway: fe80::2e2:69ff:fe24:7a04%23
IPv6 DNS Server: 240e:390:802:3ae0::1

Why is this a problem? Gateway in IPv6 works fine with LL addresses.

Proxy plugin upon Br-Lan is involved to control downstream devices, so I need to set the router as the default gateway, like the DNS server.

You can set the LL address, not an issue. Don't neglect to specify the interface, the %23 part.

Sorry, I don't know what to do. Would you mind telling me the details?

If LL addresses seem complicated to you, you can also use the ULA addresses that OpenWrt is distributing by default alongside the GUA.

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