wireguard with PPPoE

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kiner_xix
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Joined: 07 Jan 2020
Posts: 7

PostPosted: Sat Feb 01, 2025 17:42    Post subject: wireguard with PPPoE Reply with quote
Hallo,

until a few weeks, my internet ISP got me a internet connection via DHCP and everything works fine, including a wireguard connection via a Dyndns provider.

But now i had to change to PPPoE an my internet connection still works fine.

But with PPPoE my wireguard configuration do not work anymore.

Before, i had an dyndns provider an had no problem to access my ddwrt router from outside.
With my current setting, i can establish "internal" wireguard connection, if i use the enpoint IPv4: 100.97.64.155 (see top right as IP in the attached picture, which i got from my ISP).


But if I try to connect via wireguard from outside (for example via NO-IP.com) i got no connection with wireguard.

Even if i use my public IP address 207.89.118.xxx as endpoint IP, I cannot connect to my router.


What I'm doing wrong?



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egc
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Joined: 18 Mar 2014
Posts: 13647
Location: Netherlands

PostPosted: Sat Feb 01, 2025 17:53    Post subject: Reply with quote
If your routers WAN address is 100.97.64.155 then you are behind cgnat which means you do not have a Public IPv4 address.
https://en.m.wikipedia.org/wiki/Carrier-grade_NAT

You should ask your provider about it

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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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kiner_xix
DD-WRT Novice


Joined: 07 Jan 2020
Posts: 7

PostPosted: Sat Feb 01, 2025 18:19    Post subject: Reply with quote
egc wrote:
If your routers WAN address is 100.97.64.155 then you are behind cgnat which means you do not have a Public IPv4 address.
https://en.m.wikipedia.org/wiki/Carrier-grade_NAT

You should ask your provider about it



But my dyndns connection shows, that it connects successfully.

Does this not help??
egc
DD-WRT Guru


Joined: 18 Mar 2014
Posts: 13647
Location: Netherlands

PostPosted: Sat Feb 01, 2025 18:30    Post subject: Reply with quote
Unfortunately not
_________________
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
kernel-panic69
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Joined: 08 May 2018
Posts: 16116
Location: Texas, USA

PostPosted: Sat Feb 01, 2025 18:35    Post subject: Reply with quote
You have to use another method for being behind CGNAT such as zerotier, tailscale, or ngrok.
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kiner_xix
DD-WRT Novice


Joined: 07 Jan 2020
Posts: 7

PostPosted: Sat Feb 01, 2025 18:36    Post subject: Reply with quote
thanks for your reply.

At least, i know what I have to ask for.
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