How to block access to router and keep internet access for vpn connection

Installing and Using OpenWrt Network and Wireless Configuration
1

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Hi i have created this vpn. Although it works perfectly fine but when connected, the connected user can access my router's access page and if i run a server on one of the connected device like a webserver on port 8000 it can access it on like 192.168.1.100:8000 .

I want the vpn to be able to access internet and not the router or any lan ip. How can i achieve this. Sorry i don't know much of networking.
Any help is appreciated. Thank you.

Edit:

root@OpenWrt:~# ubus call system board
{
	"kernel": "5.15.162",
	"hostname": "OpenWrt",
	"system": "MediaTek MT7621 ver:1 eco:3",
	"model": "TP-Link Archer C6 v3",
	"board_name": "tplink,archer-c6-v3",
	"rootfs_type": "squashfs",
	"release": {
		"distribution": "OpenWrt",
		"version": "23.05.4",
		"revision": "r24012-d8dd03c46f",
		"target": "ramips/mt7621",
		"description": "OpenWrt 23.05.4 r24012-d8dd03c46f"
	}
}

root@OpenWrt:~# cat /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 'fd37:8cf5:57aa::/48'
	option packet_steering '1'

config device
	option name 'br-lan'
	option type 'bridge'
	list ports 'lan1'
	list ports 'lan2'
	list ports 'lan3'
	list ports 'lan4'

config interface 'lan'
	option device 'br-lan'
	option proto 'static'
	option ipaddr '192.168.1.1'
	option netmask '255.255.255.0'
	option ip6assign '60'
	option ipv6 '0'
	option delegate '0'

config interface 'wan'
	option device 'wan'
	option proto 'pppoe'
	option username 'username'
	option password 'password'
	option ipv6 '0'
	option peerdns '0'
	list dns '127.0.0.1'

config device
	option name 'vpn'
	option ipv6 '0'

config interface 'vpn'
	option proto 'wireguard'
	option private_key 'private_key'
	option listen_port '8009'
	list addresses '10.0.100.1/24'
	list dns '127.0.0.1'

config wireguard_vpn
	option public_key 'public_key'
	option private_key 'private_key
	option preshared_key 'preshared_key'
	list allowed_ips '10.0.100.2/32'
	option route_allowed_ips '1'

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

config wifi-device 'radio0'
	option type 'mac80211'
	option path '1e140000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0'
	option channel '1'
	option band '2g'
	option htmode 'HT20'
	option cell_density '0'
	option txpower '22'
	option country 'CA'

config wifi-iface 'default_radio0'
	option device 'radio0'
	option network 'lan'
	option mode 'ap'
	option ssid 'ssid'
	option encryption 'psk2'
	option key 'key'
	option isolate '1'
	option ifname 'Guest'

config wifi-device 'radio1'
	option type 'mac80211'
	option path '1e140000.pcie/pci0000:00/0000:00:01.0/0000:02:00.0'
	option channel '149'
	option band '5g'
	option htmode 'VHT40'
	option cell_density '0'
	option country 'CA'
	option txpower '24'

config wifi-iface 'default_radio1'
	option device 'radio1'
	option network 'lan'
	option mode 'ap'
	option ssid 'ssid'
	option encryption 'psk2'
	option key 'key'
	option ifname 'Personal'

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

config dnsmasq
	option domainneeded '1'
	option localise_queries '1'
	option rebind_protection '1'
	option rebind_localhost '1'
	option local '/lan/'
	option domain 'lan'
	option expandhosts '1'
	option cachesize '1000'
	option authoritative '1'
	option readethers '1'
	option leasefile '/tmp/dhcp.leases'
	option localservice '1'
	option ednspacket_max '1232'
	option noresolv '1'
	list server '127.0.0.1#5453'

config dhcp 'lan'
	option interface 'lan'
	option start '100'
	option limit '150'
	option leasetime '12h'
	option dhcpv4 'server'
	option ra 'server'
	option ra_slaac '1'
	list ra_flags 'managed-config'
	list ra_flags 'other-config'

config dhcp 'wan'
	option interface 'wan'
	option ignore '1'

config odhcpd 'odhcpd'
	option maindhcp '0'
	option leasefile '/tmp/hosts/odhcpd'
	option leasetrigger '/usr/sbin/odhcpd-update'
	option loglevel '4'

config host
	option ip '192.168.1.100'
	option leasetime 'infinite'
	option name 'name'
	list mac 'mac'

config host
	option name 'name'
	list mac 'mac'
	option ip '192.168.1.200'
	option leasetime 'infinite'

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

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

config zone
	option name 'lan'
	option input 'ACCEPT'
	option output 'ACCEPT'
	option forward 'ACCEPT'
	list network 'lan'
	list network 'vpn'

config zone
	option name 'wan'
	option input 'REJECT'
	option output 'ACCEPT'
	option forward 'REJECT'
	option masq '1'
	option mtu_fix '1'
	list network 'wan'
	list network '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 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 redirect
	option dest 'lan'
	option target 'DNAT'
	option name 'Webserver'
	option family 'ipv4'
	list proto 'tcp'
	option src 'wan'
	option src_dport '80'
	option dest_ip '192.168.1.100'
	option dest_port '8008'

config redirect
	option dest 'lan'
	option target 'DNAT'
	option name 'vpn'
	option family 'ipv4'
	list proto 'udp'
	option src 'wan'
	option src_dport '8009'
	option dest_ip '10.0.100.1'
	option dest_port '8009'
3

Please connect to your OpenWrt device using ssh and copy the output of the following commands and post it here using the "Preformatted text </> " button:
grafik
Remember to redact passwords, MAC addresses and any public IP addresses you may have:

ubus call system board
cat /etc/config/network
cat /etc/config/wireless
cat /etc/config/dhcp
cat /etc/config/firewall
4

Hi thank you for your reply. I have edited and added that part.

5

It looks like you are running a WireGuard server , so clients from the internet can connect to your home ?

Remove this:

Replace with:

config rule 'wg'
	option name 'Allow-WireGuard'
	option src 'wan'
	option dest_port '8009'
	option proto 'udp'
	option target 'ACCEPT'

Remove list network 'vpn'

Add a new vpn zone for the vpn interface:

config zone
	option name 'wgserver'
	option input 'REJECT'
	option network 'vpn'
	option output 'ACCEPT'
	option forward 'REJECT'

Make forwarding rule so that the connected VPN users can reach the internet:

config forwarding
	option src 'wgserver'
	option dest 'wan'

Oh and delete list dns '127.0.0.1', dns should be the upstream DNS resolver not the router itself

2 Likes
6

Thank you for your time with the config but I did not succeed configuring your the suggestion. But i figured out this config and it worked. Do you think this config is wrong or could be exploited?

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

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

config zone
	option name 'lan'
	option input 'ACCEPT'
	option output 'ACCEPT'
	option forward 'ACCEPT'
	list network 'lan'
	list network 'vpn'

config zone
	option name 'wan'
	option input 'REJECT'
	option output 'ACCEPT'
	option forward 'REJECT'
	option masq '1'
	option mtu_fix '1'
	list network 'wan'
	list network '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 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 redirect
	option dest 'lan'
	option target 'DNAT'
	option name 'vpn'
	option family 'ipv4'
	list proto 'udp'
	option src 'wan'
	option src_dport '8009'
	option dest_ip '10.0.100.1'
	option dest_port '8009'

config rule
	option src 'lan'
	list dest_ip '192.168.1.1/32'
	option dest_port '53'
	option target 'ACCEPT'
	option name 'Allow dns'
	list src_ip '10.0.100.1/24'
	option direction 'in'
	option device 'vpn'

config rule
	option name 'Allow own vpn'
	option direction 'in'
	option device 'vpn'
	option family 'ipv4'
	option src 'lan'
	list src_ip '10.0.100.2/32'
	list dest_ip '192.168.1.1/24'
	option target 'ACCEPT'

config rule
	option direction 'in'
	option device 'vpn'
	option family 'ipv4'
	option target 'DROP'
	option name 'Block Vpn'
	option src 'lan'
	list src_ip '10.0.100.1/24'
	list dest_ip '192.168.1.1/24'
	list proto 'all'

config redirect
	option dest 'lan'
	option target 'DNAT'
	option name 'webserver'
	option family 'ipv4'
	list proto 'tcp'
	option src 'wan'
	option src_dport '80'
	option dest_ip '192.168.1.100'
	option dest_port '8008'
7

That is not the proper way to do it but if you are happy I am happy.

1 Like