Troubleshooting WireGuard connections

[Eric Light]

Hi Riccardo,

Welcome!  Not off-topic at all.

Your config looks fine to my eyes; I don't think you _need_ different ports per endpoint, but I might be wrong.

With your tcpdump, if you can see incoming ICMP requests you should see outgoing ones too -- make sure they're not coming in on wg0 and going out on eth0; I've had that happen to me before.  Can you send through the output of: `tcpdump -ni any icmp`?

E

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On Thu, 12 Apr 2018, at 21:09, Riccardo Berto wrote:
> WireGuard doesn't always work with my devices.
> I ran out of options for troubleshooting it so I'm writing here, hoping 
> for a stable solution. I see it's not a strict devel-only mailing list 
> but if I'm off-topic I apologize in advance and I'll fade-out in the 
> background, waiting for better times.
> 
> Here's my problem: WireGuard "sometimes" works. I have a client that 
> always talks with the server without problems (the laptop, 10.0.0.4), it 
> always pings and trasfers data correctly. It just works as expected. I 
> have 2 others (Raspberry Pis: 10.0.0.2, 10.0.0.3) that don't work most 
> of the time. I tried enabling the PersistentKeepalive feature on those 
> and the WireGuard interface has some low traffic due to it but no chance 
> of pinging or having traffic with them 99 times out of 100. "tcpdump -i 
> wg0" shows ping requests, from both sides, but no answers.
> In the rare occasions they work, I can ping everyone from every client, 
> as expected with my configuration files.
> 
> Also, with all the devices I tried both the new systemd-networkd's 
> WireGuard implementation and systemd's wg-quick at wg0.service method, as 
> well as testing manually with wg-quick. The systemd version is 238.
> Archlinux is running on every node and I'm using the latest publicly 
> available WireGuard snapshot as of writing this, 20180304.
> 
> 
> #####################################
> # Server config (VPS on vultr.com): #
> #####################################
> [Interface]
> Address = 10.0.0.1/24
> SaveConfig = true
> ListenPort = 21
> PrivateKey = ------------
> 
> [Peer]
> PublicKey = ------------
> AllowedIPs = 10.0.0.3/32
> Endpoint = Client1:51820
> PersistentKeepalive = 30
> 
> [Peer]
> PublicKey = ------------
> AllowedIPs = 10.0.0.4/32
> Endpoint = Client3:51821
> 
> [Peer]
> PublicKey = ------------
> AllowedIPs = 10.0.0.2/32
> Endpoint = Client2:21
> PersistentKeepalive = 30
> 
> 
> #####################################
> # Client 1 config (Raspberry Pi 3): #
> #####################################
> [Interface]
> Address = 10.0.0.3/24
> ListenPort = 51820
> PrivateKey = ------------
> 
> [Peer]
> PublicKey = ------------
> AllowedIPs = 10.0.0.1/24
> Endpoint = VPS:21
> 
> 
> #####################################
> # Client 2 config (Raspberry Pi 3): #
> #####################################
> [Interface]
> Address = 10.0.0.2/24
> PrivateKey = ------------
> ListenPort = 21
> 
> [Peer]
> PublicKey = ------------
> AllowedIPs = 10.0.0.1/24
> Endpoint = VPS:21
> 
> 
> ##############################################
> # Client 3 config (personal laptop, x86_64): #
> ##############################################
> [Interface]
> Address = 10.0.0.4/24
> ListenPort = 51821
> PrivateKey = ------------
> 
> [Peer]
> PublicKey = ------------
> AllowedIPs = 10.0.0.0/24
> Endpoint = VPS:21
> 
> 
> 
> Any help is appreciated.
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