ISP is giving me just ipv6 /64 prefix (I think)

[LuisNara]

Hi, I had a problem a few days ago (I have ipv6 on my router on wan6 and LAN interfaces) and reading this forum I found these two topics with the same problem.

IPv6 works on the router but doesn't work on LAN devices

If the ISP only offers a single /64, don't request a prefix at all, and use RA and NDP in relay mode. Your LAN clients will SLAAC their address within the same /64, so they do have a unique public IP and a non-NAT connection to the Internet. The LAN interface itself will not hold a public IPv6-- it doesn't need to, only the WAN does.

What settings should I change to achieve this?

IPv6 working on router but not on clients

In IPv6 the first 64 bits are network address, and then the next 64 bits are host address. Each site should get a /56 at the minimum, this lets you set up 64-56=8 bits worth of subnets, that's 256 subnets. Instead, ISPs give out a single /64 and it gets put on the WAN subnet, so it's just enough for the router itself to get on the network. The relay mode attempts to "fix" his but it's really just a hack, like when you order a truckload of bricks and they come with an enormous truck and give yo…

Whts the relay setting @dlakelan is talking about?

[moeller0]

According to the odhcpd documentation
you need to add the following sections:

ra	string		disabled	Router Advert service. Set to disabled, server, relay or hybrid.
dhcpv6	string		disabled	DHCPv6 service. Set to disabled, server, relay or hybrid.
dhcpv4	string		disabled	DHCPv4 service. Set to disabled or server.
ndp	string		disabled	Neighbor Discovery Proxy. Set to disabled, relay or hybrid.
probably to /etc/config/dhcp as part of config dhcp 'wan' or maybe config dhcp 'wan6' and lan:

Something like this might work:

# file: /etc/config/dhcp
config dhcp 'lan'
        option interface 'lan'
        option start '100'
        option limit '150'
        option leasetime '12h'
        option dhcpv4 'server'
        option ra 'relay'
        list ra_flags 'none'
        option dhcpv6 'relay'
        option ndp 'relay'

config dhcp 'wan'
        option interface 'wan'
        option ignore '1'
        option master '1'
        option ra 'relay'
        option dhcpv6 'relay'
        option ndp 'relay'
        list ra_flags 'none'

[LuisNara]

I just have to put that code in ssh console?

Thank you

[LuisNara]

its fixed now, from anyone wondering specially from Mexico ISP Megacable, they are issuing /64 prefixes, these are just enough bits for address but no for host, so, in wan6 interface just change IPV6 prefix request to disabled, and set RA, DHCPV6 and NDP to relay, i did it in both wan6 and lan,and disabled DHCP on wan6.

Megacable technical support said it wasnt possible and i'm proud of my self, regards