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 11 months ago* (last edited 11 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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[–] taaz@biglemmowski.win 2 points 11 months ago* (last edited 11 months ago) (1 children)

This probably does not apply for you but don't try sending wg over port 53, learned the hard way some routers simply won't pass non-dns packets there.

~~Otherwise considering you are able to access VPS stuff from phone but not the router connected to the same VPS then I would check~~

  • ~~if forwarding is enabled on the vps~~
  • ~~if you can't see any packets on the router side then it sounds like a routing issue at the vps~~

E: I am too baked and assumed you are trying to have the VPS as a central hop point.

[–] SeeJayEmm@lemmy.procrastinati.org 1 points 11 months ago

My backup plan is to route the traffic through the VPS to the home network. I was hoping to avoid that hop.