this post was submitted on 20 Dec 2023
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[Fixed] Weird Wireguard issues I could use some help with. (lemmy.procrastinati.org)
submitted 10 months ago* (last edited 10 months ago) by SeeJayEmm@lemmy.procrastinati.org to c/selfhosted@lemmy.world
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I've hit a wall with a weird Wireguard issue. I'm trying to connect my phone (over cell) to my home router using wireguard and it will not connect.

  • The keys are all correct.
  • The IPs are all correct.
  • The ports are open on the firewall.
  • My router has a public IP, no CGNAT.

The router is opnsense, I have a tcpdump session going and when I attempt a connection from the phone I see 0 packets on that port. I am able to ping the router and reach the web server sitting behind it from the phone.

I have a VPS that I configured WG on and the phone connects fine to that. I also tested configuring the VPS to connect to my home router and that also works fine.

I'm really at a loss as to where to go next.

Edit 2: I completely blew out the config on both sides and rebuilt it from scratch, using a different UDP port, and it all appears to be working now. Thanks for everyone's help in tracking this down.

Edit: It was requested I provide my configs.

opnsense:

####################################################
# Interface settings, not used by `wg`             #
# Only used for reference and detection of changes #
# in the configuration                             #
####################################################
# Address =  172.31.254.1/24
# DNS =
# MTU =
# disableroutes = 0
# gateway =

[Interface]
PrivateKey = 
ListenPort = 51821

[Peer]
# friendly_name = note20
PublicKey = 
AllowedIPs = 172.31.254.100/32

Android:

[Interface]
Address = 172.31.254.100/32
PrivateKey = 

[Peer]
AllowedIPs = 0.0.0.0/32
Endpoint = :51821
PublicKey =
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[–] revv@lemmy.blahaj.zone 4 points 10 months ago (1 children)

One issue I've had in some networks is that wg will connect, but not receive any traffic from the network. You can try to set up a static route for your wg subnet pointing at your wg server's local IP.

No idea if that's your issue though.

[–] SeeJayEmm@lemmy.procrastinati.org 1 points 10 months ago

It definitely not connecting. I get no handshake stats on either side and my tcpdump shows 0 packets to try and even initiate the tunnel.