No connection and no handshake problems with wireguard

Installing and Using OpenWrt
1

Hello! I'm trying to set up a wireguard on my router, but I can't connect to the server. The network interface wg0 is not responding to the client.

root@OpenWrt:~# wg show
interface: wg0
  public key: ****
  private key: (hidden)
  listening port: 51820

peer: *****
  allowed ips: 192.168.9.2/32
  persistent keepalive: every 25 seconds

root@OpenWrt:~# cat /etc/config/firewall

config defaults
        option syn_flood '1'
        option input 'ACCEPT'
        option output 'ACCEPT'
        option forward 'REJECT'

config zone 'lan'
        option name 'lan'
        option input 'ACCEPT'
        option output 'ACCEPT'
        option forward 'ACCEPT'
        option network 'lan wg0'

config zone 'wan'
        option name 'wan'
        option input 'REJECT'
        option output 'ACCEPT'
        option forward 'REJECT'
        option masq '1'
        option mtu_fix '1'
        option network 'wan wan6'

config forwarding
        option src 'lan'
        option dest 'wan'

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 include
        option path '/etc/firewall.user'

config rule
        option target 'ACCEPT'
        option proto 'udp'
        option name 'Allow Wireguard'
        option src '*'
        option dest_port '51820'

config zone
        option input 'ACCEPT'
        option forward 'REJECT'
        option output 'ACCEPT'
        option name 'wireguard'
        option masq '1'

config forwarding
        option dest 'wan'
        option src 'wireguard'

config forwarding
        option dest 'wan'
        option src 'lan'

config forwarding
        option dest 'wireguard'
        option src 'lan'

config forwarding
        option dest 'lan'
        option src 'wireguard'

root@OpenWrt:~# cat /etc/config/network

config interface 'loopback'
        option ifname 'lo'
        option proto 'static'
        option ipaddr '127.0.0.1'
        option netmask '255.0.0.0'

config globals 'globals'
        option ula_prefix 'fd90:bf8b:731d::/48'

config interface 'lan'
        option type 'bridge'
        option ifname 'eth0.1'
        option proto 'static'
        option ipaddr '192.168.1.1'
        option netmask '255.255.255.0'
        option ip6assign '60'

config device 'lan_dev'
        option name 'eth0.1'
        option macaddr '****'

config interface 'wan'
        option ifname 'eth0.2'
        option proto 'dhcp'

config device 'wan_dev'
        option name 'eth0.2'
        option macaddr '****'

config interface 'wan6'
        option ifname '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 '0 6t'

config wireguard_wg0
        option route_allowed_ips '1'
        option persistent_keepalive '25'
        option public_key '****'
        list allowed_ips '192.168.9.2/32'

config interface 'wg0'
        option proto 'wireguard'
        option listen_port '51820'
        option private_key '****'
        list addresses '192.168.9.1/24'


client configuration on Windows:

[Interface]
PrivateKey = ****
Address = 192.168.9.2/32
DNS = 192.168.9.1

[Peer]
PublicKey = ****
AllowedIPs = 0.0.0.0/1, 128.0.0.0/1
Endpoint = 192.168.1.1:51820

image
image1439×146 20.7 KB

I tried to listen to traffic through tcpdump, the connection on port 51820 passes through the eth0 interface, no packets go through wg0.

I tried to connect both through the local address 192.168.1.1 in the local Wifi network, and through the wan through an external IP address, the result is the same - packets are sent, the udp firewall passes traffic, but there is no response from the server. Help me please!

1 Like
2

Looks like some issue with the keys.
Try the automated setup and use the generated client profile:
https://openwrt.org/docs/guide-user/services/vpn/wireguard/extras#automated

3 Likes
3

Thank you very much! Everything worked through the automatic installation.

1 Like
4

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