[Grzegorz.Janoszka]

Hi,
My provider (Ziggo in the Netherlands) finally enabled for me IPv6 prefix delegation (with the modem in bridge mode).

I have followed all threads about dd-wrt and v6 PD I could find, have tried different builds and I still have no results.

Router: Linksys E2000
Build: DD-WRT v3.0-r45955 mega (03/09/21)

My router gets IPv6 on its WAN interface, but nothing for the LAN:

ip -6 route shows among other:
2a02:a204:YY:XX:656e:8150:6ac9:fa4e dev vlan2 metric 256

There is no public route route on br0 interface.

Custom dhcp6c:

interface vlan2 {
send ia-na 0;
send ia-pd 0;
send rapid-commit;
request domain-name-servers;
script "/sbin/dhcp6c-state";
};
id-assoc pd 0 {
prefix-interface br0 {
sla-id 0;
sla-len 8;
};
};
id-assoc na 0 { };

I have the correct prefix length (/56 as the provider advises).

The command radvdump shows me RA's coming from the provider and I get three subnets together:

2a02:a204:YY:XX::/64 dev vlan2 metric 256
2a02:a204:YY:20XX::/64 dev vlan2 metric 256
2a02:a204:YY:40XX::/64 dev vlan2 metric 256

They are assigned to vlan2. Are these two last ones the additional subnets that have to be manually defined and configured on br0?

How can I check why my br0 gets no addresses? Is there a way to debug it, get some logs? Not sure where the problem is - with my router or with the provider side.

Any hints would be highly appreciated. Thank you in advance.

[the-joker]

Welcome to the forums

issue nr one, your dd-wrt build is way way WAY old. without an upgrade to latest and followed by a reset to default and reconfiguration from scratch, Im sorry to inform you, that I personally wont be able to go further.

Your build is years old and many many fixes went into dd-wrt since then. So thus unsupported.

This build below isnt the newest build but it also is a safer build for now.

http://ftp.dd-wrt.com/dd-wrtv2/downloads/betas/2022/05-30-2022-r48996/

Regards.

[Mile-Lile]

[Grzegorz.Janoszka]

[Grzegorz.Janoszka]

[quote="Mile-Lile"]

[Grzegorz.Janoszka]

Initially I had to add IPv6 default route manually, but after another reboot everything seemed to work just fine.

Thank you for a fantastic help. Hopefully other people will google this post in case of similar issues.

[Mile-Lile]

you are welcome... there is no need to change anything in GUI setup when using PD (prefix delegation). If you leave it as is, it will work out of the box in 99% cases. BS allways try to solve problems globally (setups must work for majority of ISPs):



Especially do NOT chane prefix lenght! You cannot demand lenght from ISP. No matter if it is /64 in the GUI you will get /48, /56 or /64 and thats something your ISP decides... Once you got working enviroment you can play with it:)

The only problem I had was with RDNSS and only with 1 old android (9.0) cell phone... I solved it with putting the relevant global address (in custom radvd) of the machine (address is in upper right corner of ddwrt gui).

[the-joker]

Again, upgrade... 15 months old or 15 years or 15 days are not supported dont have the latest code fixes, security patches or whatever else you want to add to that list.

On that note when you flash the latest DD-WRT build you should do a reset to factory defaults and reconfigure the router from scratch as well as clearing the browser cache CTRL+F5 on the page, to ensure the new UI loads properly.