[Solved] Peer to peer connection through Wireguard

Installing and Using OpenWrt
1

Hi,
I have a Wireguard server running on OpenWRT and I would like to have a peer to peer connection between Peer A (Win10 client) and B (Linux client) through the server (basically Peer B should act like it's part of A's LAN).

As you can see from the map of my network, Peer A is on the same LAN as the WG server while Peer B is on the internet. You might have noticed Peer C (Mac client) but I am not interested in connecting directly to it right now. I have a static public IP for the WAN interface which should be under NAT.

As of now everything works fine except that Peer B cannot reach A:

  • Peer A cannot ping the WG server, got "General Failure" error in Powershell

  • Peer A can ping B and not vice versa because packets get lost

  • Peer B can ping the WG server

Note that Peer A firewall is disabled. Could you please tell me what's wrong? Thanks in advance!

dd.drawio
dd.drawio664×591 28.6 KB

/etc/config/firewall

config defaults

option input 'ACCEPT'

option output 'ACCEPT'

option synflood_protect '1'

option forward 'REJECT'

config zone

option name 'lan'

option input 'ACCEPT'

option output 'ACCEPT'

option forward 'ACCEPT'

list network 'lan'

config zone

option name 'wan'

list network 'wan'

list network 'wan6'

option output 'ACCEPT'

option forward 'REJECT'

option masq '1'

option mtu_fix '1'

option input 'REJECT'

config rule

option name 'Allow-DHCP-Renew'

option src 'wan'

option proto 'udp'

option dest_port '68'

option target 'ACCEPT'

option family 'ipv4'

config rule

option name 'Allow-Ping'

option src 'wan'

option proto 'icmp'

option icmp_type 'echo-request'

option family 'ipv4'

option target 'ACCEPT'

config rule

option name 'Allow-IGMP'

option src 'wan'

option proto 'igmp'

option family 'ipv4'

option target 'ACCEPT'

config rule

option name 'Allow-DHCPv6'

option src 'wan'

option proto 'udp'

option src_ip 'fc00::/6'

option dest_ip 'fc00::/6'

option dest_port '546'

option family 'ipv6'

option target 'ACCEPT'

config rule

option name 'Allow-MLD'

option src 'wan'

option proto 'icmp'

option src_ip 'fe80::/10'

list icmp_type '130/0'

list icmp_type '131/0'

list icmp_type '132/0'

list icmp_type '143/0'

option family 'ipv6'

option target 'ACCEPT'

config rule

option name 'Allow-ICMPv6-Input'

option src 'wan'

option proto 'icmp'

list icmp_type 'echo-request'

list icmp_type 'echo-reply'

list icmp_type 'destination-unreachable'

list icmp_type 'packet-too-big'

list icmp_type 'time-exceeded'

list icmp_type 'bad-header'

list icmp_type 'unknown-header-type'

list icmp_type 'router-solicitation'

list icmp_type 'neighbour-solicitation'

list icmp_type 'router-advertisement'

list icmp_type 'neighbour-advertisement'

option limit '1000/sec'

option family 'ipv6'

option target 'ACCEPT'

config rule

option name 'Allow-ICMPv6-Forward'

option src 'wan'

option dest '*'

option proto 'icmp'

list icmp_type 'echo-request'

list icmp_type 'echo-reply'

list icmp_type 'destination-unreachable'

list icmp_type 'packet-too-big'

list icmp_type 'time-exceeded'

list icmp_type 'bad-header'

list icmp_type 'unknown-header-type'

option limit '1000/sec'

option family 'ipv6'

option target 'ACCEPT'

config rule

option name 'Allow-IPSec-ESP'

option src 'wan'

option dest 'lan'

option proto 'esp'

option target 'ACCEPT'

config rule

option name 'Allow-ISAKMP'

option src 'wan'

option dest 'lan'

option dest_port '500'

option proto 'udp'

option target 'ACCEPT'

config rule

option name 'Support-UDP-Traceroute'

option src 'wan'

option dest_port '33434:33689'

option proto 'udp'

option family 'ipv4'

option target 'REJECT'

option enabled '0'

config include

option path '/etc/firewall.user'

config include 'miniupnpd'

option type 'script'

option path '/usr/share/miniupnpd/firewall.include'

option family 'any'

option reload '1'

config rule

option name 'Allow-Wireguard-Inbound'

list proto 'udp'

option src 'wan'

option dest_port '50820'

option target 'ACCEPT'

option dest 'wgnet'

config redirect

option target 'DNAT'

list proto 'udp'

option src 'wan'

option src_dport '50820'

option dest_port '50820'

option dest 'wgnet'

option dest_ip '192.168.0.1'

option name 'WAN_WGNET_R7800'

config zone

option name 'wgnet'

option input 'ACCEPT'

option output 'ACCEPT'

option forward 'ACCEPT'

option masq '1'

list network 'wgnet'

config forwarding

option src 'lan'

option dest 'wan'

config forwarding

option src 'wgnet'

option dest 'lan'

config forwarding

option src 'wgnet'

option dest 'wan'

config forwarding

option src 'lan'

option dest 'wgnet'

config forwarding

option src 'wan'

option dest 'wgnet'

/etc/config/network

config interface 'loopback'

option device 'lo'

option proto 'static'

option ipaddr '127.0.0.1'

option netmask '255.0.0.0'

config globals 'globals'

option ula_prefix 'fd54:538b:baad::/48'

config device

option name 'br-lan'

option type 'bridge'

list ports 'eth1.1'

config interface 'lan'

option device 'br-lan'

option proto 'static'

option netmask '255.255.255.0'

option ip6assign '60'

option ipaddr '192.168.0.1'

config interface 'wan'

option device 'eth0.2'

option proto 'dhcp'

config interface 'wan6'

option device 'eth0.2'

option proto 'dhcpv6'

config switch

option name 'switch0'

option reset '1'

option enable_vlan '1'

config switch_vlan

option device 'switch0'

option vlan '1'

option ports '1 2 3 4 6t'

config switch_vlan

option device 'switch0'

option vlan '2'

option ports '5 0t'

config interface 'wgnet'

option proto 'wireguard'

option private_key '<wg-server-private-key>'

option listen_port '50820'

list addresses '10.0.0.1/32'

config wireguard_wgnet

option description 'Peer B'

option public_key '<peer-B-public-key>'

option persistent_keepalive '25'

list allowed_ips '10.0.0.3/32'

option route_allowed_ips '1'

config wireguard_wgnet

option description 'Peer A'

option public_key '<peer-A-public-key>'

list allowed_ips '10.0.0.2/32'

option persistent_keepalive '25'

option route_allowed_ips '1'

WG server config

[Interface]

ListenPort = 50820

PrivateKey = <wg-server-private-key>

[Peer]

PublicKey = <peer-B-public-key>

AllowedIPs = 10.0.0.3/32

PersistentKeepalive = 25

[Peer]

PublicKey = <peer-A-public-key>

AllowedIPs = 10.0.0.2/32

PersistentKeepalive = 25

Peer A config

[Interface]

PrivateKey = <peer-A-private-key>

Address = 10.0.0.2/32

[Peer]

PublicKey = <wg-server-public-key>

AllowedIPs = 10.0.0.1/32

PersistentKeepalive = 25

Peer B config

[Interface]

PrivateKey = <peer-B-private-key>

Address = 10.0.0.3/32

[Peer]

PublicKey = <wg-server-public-key>

AllowedIPs = 10.0.0.1/32

Endpoint = <ISP-public-IP>:50820

PersistentKeepalive = 25
2

This is really hard to read because of the formatting (or lack thereof), so I may not have found all of the related bits to change. While it does appear you did use the </> formatting, something went wrong. Here is an example of what it should look like. Please consider re-posting your config files with proper formatting if my response doesn't solve the issue.

Anyway... on to the recommendations:

Remove this:

The below is all wrong... remove this:

It should look like this:

config rule
        option name 'Allow-Wireguard-Inbound'
        list proto 'udp'
        option target 'ACCEPT'
        option src 'wan'
        option dest_port '50820'

Change the below to /24 (not /32)

This section below... is it just reiterating the network config shown just above, or do you have this somewhere else? If so, where??

The below (configs on your peer A and B) have a few issues:

Peer A doesn't have an endpoint defined... you'll need that. Probably the same as the way peer B is defined.

All of your remote peers (i.e. A, B, C) should have AllowedIPs as 10.0.0.0/24 (or maybe even more permissive if you want to access the more resources and/or the internet via the WG tunnel).

I don't see peer C's config, so can't comment there.... but hopefully the advice here will apply to that, too.

1 Like
3

Thanks a lot for your reply, everything is working flawlessly! I spent days trying to get it right since I'm quite a newbie in networking and Wireguard configuration :). I truly apologize for the formatting, I was in a hurry and didn't notice that my editor messed it up.

Cheers.

4

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