How to configure wireguard so that I can access The LAN devices behind the ROUTER?

duanyunlun · December 15, 2020, 7:49am

My Network Topology

My Purples

No matter where I am, as long as the devices connected to the VPN, they can access NAS(behind Router A) and Cameras(behind Router B);
No need to install wireguard on the LAN device, and it can be directly accessed by LAN IP on the Client side. For example, using my cellphone, open foobar2000, type in the LAN IP(192.168.2.1) + Port , it can directly access the foobar2000 UPNP service on the NAS. In short, use the least installed wireguard to access all the devices behind routers.

My Network and Firewall Setting

Here is network config :

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 'aaaa:bbbb:cccc::/48'

config interface 'lan'
	option type 'bridge'
	option ifname 'eth0.1'
	option proto 'static'
	option netmask '255.255.255.0'
	option ip6assign '60'
	option ipaddr '192.168.2.254'

config device 'lan_eth0_1_dev'
	option name 'eth0.1'
	option macaddr 'aa:bb:cc:dd:ee:ff'

config device 'wan_eth0_2_dev'
	option name 'eth0.2'
	option macaddr 'oo:pp:qq:xx:yy:zz'

config interface 'wan'
	option ifname 'eth0.2'
	option proto 'pppoe'
	option password 'hereismypppoepswd'
	option ipv6 'auto'
	option username 'hereismypppoeaccount'
	option metric '40'

config switch
	option name 'switch0'
	option reset '1'
	option enable_vlan '1'

config switch_vlan
	option device 'switch0'
	option vlan '1'
	option ports '0 1 2 3 5t'

config switch_vlan
	option device 'switch0'
	option vlan '2'
	option ports '4 5t'

config device 'veth0'
	option name 'veth0'
	option ifname 'eth0.2'
	option type 'macvlan'

config interface 'wan2'
	option ifname 'veth0'
	option proto 'pppoe'
	option password 'hereismypppoepswd'
	option metric '41'
	option username 'hereismypppoeaccount'
	option ipv6 '0'
	option delegate '0'

config interface 'wg0'
	option proto 'wireguard'
	option private_key 'hereismywireguardserverprivatekey'
	option mtu '1300'
	option delegate '0'
	option listen_port '10240'
	list addresses '192.168.100.1/24'

config wireguard_wg0
	option public_key 'hereismypcpublickey-usingfortest'
	option persistent_keepalive '25'
	option route_allowed_ips '1'
	option description 'MyPc'
	list allowed_ips '192.168.100.2/32'

config wireguard_wg0
	option public_key 'hereismycellphone'
	option description 'MyCellphone'
	option route_allowed_ips '1'
	option persistent_keepalive '25'
	list allowed_ips '192.168.100.3/32'

config route
	option gateway '192.168.2.254'
	option netmask '255.255.255.0'
	option interface 'wg0'
	option target '192.168.100.0/24'

Here is the firewall config :

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

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 wan2'

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 include 'ss_rules'
	option path '/etc/firewall.ss-rules'
	option reload '1'

config redirect
	option dest_port '3389'
	option src 'wan'
	option name 'remote desktop'
	option src_dport '00000'
	option target 'DNAT'
	option dest_ip '192.168.2.1'
	option dest 'lan'

config include 'miniupnpd'
	option type 'script'
	option path '/usr/share/miniupnpd/firewall.include'
	option family 'any'
	option reload '1'

config rule 'wg'
	option name 'Allow-WireGuard'
	option src 'wan'
	option proto 'udp'
	option target 'ACCEPT'
	option family 'ipv4'
	option dest_port '10240'

Current situation

I can ping the Router A (either 192.168.2.254 or 192.168.100.1) with my PC, Here's my PC wireguard config:

[Interface]
PrivateKey = hereismypcprivatekey
Address = 192.168.100.4/32
MTU = 1300

[Peer]
PublicKey = hereismyrouterApublickey
AllowedIPs = 192.168.100.0/32, 192.168.2.0/24
Endpoint = a.com:port
PersistentKeepalive = 25

HOPE FOR A HELP!!

vgaetera · December 15, 2020, 3:40pm

Add respective peer LANs to the allowed IPs on all peers:
https://openwrt.org/docs/guide-user/services/vpn/wireguard/extras#site-to-site

Remove that:

duanyunlun · December 16, 2020, 12:34am

Will this cause all network traffic to pass through the VPN?

vgaetera · December 16, 2020, 1:40am

No, unless you add 0.0.0.0/0.

duanyunlun · December 16, 2020, 6:41am

I retry all the stuff again and it works, But still can not visit the Samba Server behind THE SERVER ROUTER, I think it maybe is the port(445 is the default port of the SMB, and it go through under TCP), is there any solution for this?

vgaetera · December 16, 2020, 2:04pm

Use traceroute in both directions to verify routing.
Check firewall settings on the destination host.

Borromini · December 16, 2020, 7:03pm

Make sure to allow the WireGuard client range in your Samba server's firewall.

dlakelan · December 16, 2020, 7:14pm

you probably won't be able to network browse to the samba server, connect directly using the ip address.

duanyunlun · December 16, 2020, 10:07pm

I've already connected to the wg VPN and can directly use 192.168.2.1 to login RDP, but SMB still ...

duanyunlun · December 16, 2020, 10:11pm

Already tried turn it off or make some rule for 137-139,445 port to in and out, but nothing changed

duanyunlun · December 16, 2020, 10:30pm

I can ping my cellphone(using VPN IP 192.168.100.2) in my SAMBA SERVER but can not vice versa

vgaetera · December 16, 2020, 10:32pm

Are you running Samba server on Windows?
Windows firewall restricts incoming connections by default allowing only local sunbnet.

duanyunlun · December 16, 2020, 11:55pm

Yes, I'm running Samba Server on windows, Does it not allow wg VPN network to access Samba Share??

dlakelan · December 16, 2020, 11:56pm

the remote network is on a different subnet, so it sounds like you will have to edit the windows firewall, but I know nothing about windows firewalls.

duanyunlun · December 17, 2020, 12:02am

Before I used Zerotier for VPN networking, I can directly use the VPN address to access the SMB service. I don’t know if there is a big difference between Zerotier and WG