Selfhosted

39254 readers

297 users here now

A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.

Rules:

Be civil: we're here to support and learn from one another. Insults won't be tolerated. Flame wars are frowned upon.
No spam posting.
Posts have to be centered around self-hosting. There are other communities for discussing hardware or home computing. If it's not obvious why your post topic revolves around selfhosting, please include details to make it clear.
Don't duplicate the full text of your blog or github here. Just post the link for folks to click.
Submission headline should match the article title (don’t cherry-pick information from the title to fit your agenda).
No trolling.

Resources:

Any issues on the community? Report it using the report flag.

Questions? DM the mods!

founded 1 year ago

MODERATORS

[Solved] Need some wireguard help (lemmy.dbzer0.com)

submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/selfhosted

8 comments fedilink hide all child comments

I've used wireguard for a pretty long time on my server and the phone as a client. I've had the same configuration for at least 4-5 years and never had issues. Last week I moved to using pihole in a container with a macvlan interface, so it has a different IP address than my physical server. Then I went and changed the DNS server IP on the wireguard config on the phone. When I reconnected I see I can't connect to any local IP address like I used to and I can't figure out why.

The local LAN is 10.11.12.0/24, the VPN is on 10.11.13.0/24.

Here's the server wireguard config:

[Interface]
Address = 10.11.13.1
ListenPort = 11194
PrivateKey = ...

PostUp = iptables -A FORWARD -i %i -j ACCEPT; iptables -A FORWARD -o %i -j ACCEPT; iptables -t nat -A POSTROUTING -o enp3s0 -j MASQUERADE
PostDown = iptables -D FORWARD -i %i -j ACCEPT; iptables -D FORWARD -o %i -j ACCEPT; iptables -t nat -D POSTROUTING -o enp3s0 -j MASQUERADE

[Peer]
# Galaxy S20+
PublicKey = U59JZqVbk2eFxTb7tteyu0WHlMTZsk68E7CF7v2AX2U=
AllowedIPs = 10.11.13.5/32

[Peer]
# narwhal - T480 job
PublicKey = Ja9OL13IoZA17GJq0/LbwizB9s2dRQLHHgW2C4TcFyY=
AllowedIPs = 10.11.13.7/32

And here's the phone's wireguard config:

Address = 10.11.13.5/24
DNS = 10.11.12.55
PrivateKey = ....

[Peer]
AllowedIPs = 10.11.0.0/16
Endpoint = my_dyndns_hostname:11194
PublicKey = 6aF1cJhH9oeQWr9LYOpH3wk+lN4k9/tSiAqV6LkUQ1Y=

I am able to connect and can ping 10.11.12.77, the IP address of the server, but nothing else. I have two RPis running as mpd servers and I used to be able to connect to them too, but not anymore. Their IP addresses are 10.11.12.105 and .106.

Also, before the dns change I was able (of course!) to use the local DNS I set up on the pihole, but now I'm not able to connect to the new DNS (.55) so I can't get any local address to resolve.

I'm looking for some hints on what I'm doing wrong. Please help.

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 1 points 1 year ago (1 children)

Can you show the diff with your previous WG config?
Is 10.11.12.0/24 also on enp3s0?

I am able to connect and can ping 10.11.12.77, the IP address of the server, but nothing else

Including the wider internet, if you set your phone's AllowedIPs to 0.0.0.0/0? This makes me think it's a problem with the NAT, not so much wireguard. Also make sure ipv4 forwarding is enabled:

sysctl -w net.ipv4.conf.default.forwarding=1
sysctl -w net.ipv4.conf.enp3s0.forwarding=1

Reading this article might help! I know this is not what you asked, but otherwise, my approach to accessing devices on my LAN is to also include them in the WG VPN - so that they all have an IP address on the VPN subnet (in your case 10.11.13.0/24). Bonus points for excluding your LAN guests from your selfhosted subnet.

[–] [email protected] 1 points 1 year ago

Can you show the diff with your previous WG config?

I didn't have a previous WG config. This is really the problem: I didn't change anything. It just stopped working. My phone connects to the server and I can ping it, and I'm also able to use the web interface on the server, but I can't connect to any other host on the network.

This makes me think it’s a problem with the NAT

This is my assumption too. Still looking into it.