Wireguard issue with IPv6 address as endpoint

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belotv
DD-WRT Novice


Joined: 06 Jul 2022
Posts: 8
Location: Belgium

PostPosted: Wed Jan 11, 2023 19:35    Post subject: Wireguard issue with IPv6 address as endpoint Reply with quote
Hi all and best wishes for 2023,

I am using DDWRT 51043 build on Archer C9 V1 and everything works fine with that build.
Later builds are however not connecting to the Wireguard peer.
I guess it as something to do with IPv6 implementation for Wireguard added in between.
Traceroute to the endpoint address is erroring. I tried to force that adress to go through WAN by using destination routing setting without success.
Any idea what should be set to use IPv6 endpoint on newer builds ?

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egc
DD-WRT Guru


Joined: 18 Mar 2014
Posts: 12835
Location: Netherlands

PostPosted: Wed Jan 11, 2023 19:54    Post subject: Reply with quote
WireGuard client does not work with IPv6 yet.

The IPv6 firewall is also undergoing upgrading.

_________________
Routers:Netgear R7000, R6400v1, R6400v2, EA6900 (XvortexCFE), E2000, E1200v1, WRT54GS v1.
Install guide R6400v2, R6700v3,XR300:https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=316399
Install guide R7800/XR500: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=320614
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belotv
DD-WRT Novice


Joined: 06 Jul 2022
Posts: 8
Location: Belgium

PostPosted: Wed Jan 11, 2023 21:17    Post subject: Reply with quote
Thanks for the info, I will stay on 51043 which works fine until IPv6 implementation is complete then.
egc
DD-WRT Guru


Joined: 18 Mar 2014
Posts: 12835
Location: Netherlands

PostPosted: Wed Jan 11, 2023 21:32    Post subject: Reply with quote
Or just use IPv4?
_________________
Routers:Netgear R7000, R6400v1, R6400v2, EA6900 (XvortexCFE), E2000, E1200v1, WRT54GS v1.
Install guide R6400v2, R6700v3,XR300:https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=316399
Install guide R7800/XR500: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=320614
Forum Guide Lines (important read):https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=324087
belotv
DD-WRT Novice


Joined: 06 Jul 2022
Posts: 8
Location: Belgium

PostPosted: Wed Jan 18, 2023 12:27    Post subject: Reply with quote
Nope, ISPs in France and some other European ISP are using CGNAT now, which means you do not have a full IPv4 anymore and you have no control over opened ports as IP is shared between customers.

If I had the choice I would not use an IPv6 endpoint to host my WG server but no other option sadly. I will stick to pre 51058 releases which are working fine waiting for a complete implementation in the future.
egc
DD-WRT Guru


Joined: 18 Mar 2014
Posts: 12835
Location: Netherlands

PostPosted: Wed Jan 18, 2023 12:54    Post subject: Reply with quote
For using WireGuard as a server the *next* public build might work again when using IPv6 at least it does for me.

The problems you encountered are possibly firewall related, the IPv6 firewall has had a major overhaul but was a bit to restrictive.
The latest patch: https://svn.dd-wrt.com/changeset/51364 was hopefully the last which was necessary.

Please check with the latest WireGuard Server setup guide, which has a paragraph about IPv6.
No guarantees as it is a WIP but let me know if you encounter problems.

_________________
Routers:Netgear R7000, R6400v1, R6400v2, EA6900 (XvortexCFE), E2000, E1200v1, WRT54GS v1.
Install guide R6400v2, R6700v3,XR300:https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=316399
Install guide R7800/XR500: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=320614
Forum Guide Lines (important read):https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=324087
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