PPTP extras

If you want to manage VPN settings using web interface. Install the necessary packages.

# Install packages
opkg update
opkg install luci-proto-ppp
service rpcd restart

Navigate to LuCI → Network → Interfaces to configure PPTP.

Preserve default route to restore WAN connectivity when VPN is disconnected.

# Preserve default route
uci set network.wan.metric="1024"
uci commit network
service network restart

Provide PPTP passthrough for LAN clients over your router.

# Install packages
opkg update
opkg install kmod-nf-nathelper-extra
service firewall restart

Provide static IP address allocation on VPN server.

# Configure VPN service
rm -f /tmp/etc/chap-secrets
uci set pptpd.client.remoteip=""
uci commit pptpd
service pptpd restart

Implement plain routing between server side LAN and client side LAN assuming that:

  • - server side LAN
  • - client side LAN

Set up static address allocation on VPN server, add route to client side LAN.

cat << "EOF" > /etc/ppp/ip-up
case ${IPREMOTE} in
( ip route add via ${IPREMOTE} dev ${IFNAME} ;;
chmod +x /etc/ppp/ip-up

Consider VPN network as private and assign VPN interface to LAN zone on VPN client, add route to server side LAN.

uci del_list firewall.wan.network="vpn"
uci add_list firewall.lan.network="vpn"
uci commit firewall
service firewall restart
uci -q delete network.vpn_rt
uci set network.vpn_rt="route"
uci set network.vpn_rt.interface="vpn"
uci set network.vpn_rt.target=""
uci set network.vpn_rt.gateway=""
uci commit network
service network restart

If you do not need to route all traffic to VPN. Disable gateway redirection on VPN client.

uci set network.vpn.defaultroute="0"
uci commit network
service network restart

If VPN gateway is separate from your LAN gateway. Implement plain routing between LAN and VPN networks assuming that:

  • - LAN network
  • - VPN gateway
  • - VPN network

Add port forwarding for VPN server on LAN gateway.

uci -q delete firewall.pptp
uci set firewall.pptp="redirect"
uci set firewall.pptp.name="Redirect-PPTP"
uci set firewall.pptp.src="wan"
uci set firewall.pptp.src_dport="1723"
uci set firewall.pptp.dest="lan"
uci set firewall.pptp.dest_ip=""
uci set firewall.pptp.family="ipv4"
uci set firewall.pptp.proto="tcp"
uci set firewall.pptp.target="DNAT"
uci commit firewall
service firewall restart

Add route to VPN network via VPN gateway on LAN gateway.

uci -q delete network.vpn
uci set network.vpn="route"
uci set network.vpn.interface="lan"
uci set network.vpn.target=""
uci set network.vpn.gateway=""
uci commit network
service network restart

Set up IPv6 tunnel broker or use IPv6 NAT or NPT if necessary. Configure IPv6 on VPN server.

cat << "EOF" > /etc/ppp/ip-up
ip address add fd00:9::1/64 dev ${IFNAME}
chmod +x /etc/ppp/ip-up

Configure IPv6 on VPN client, redirect IPv6 gateway.

uci add_list firewall.wan.network="vpn6"
uci commit firewall
service firewall restart
uci -q delete network.vpn6
uci set network.vpn6="interface"
uci set network.vpn6.proto="static"
uci set network.vpn6.device="@vpn"
uci set network.vpn6.ip6addr="fd00:9::2/64"
uci -q delete network.vpn6_rt
uci set network.vpn6_rt="route6"
uci set network.vpn6_rt.interface="vpn6"
uci set network.vpn6_rt.target="::/0"
uci commit network
service network restart

Disable ISP prefix delegation to prevent IPv6 leaks on VPN client.

Serve DNS for VPN clients on OpenWrt server when using point-to-point topology.

Route DNS over VPN to prevent DNS leaks on VPN client.

Replace peer DNS with public or VPN-specific DNS provider on OpenWrt client.

Modify the VPN connection using NetworkManager on Linux desktop client.

nmcli connection modify id VPN_CON \
ipv4.dns-search ~. ipv4.dns-priority -50 \
ipv6.dns-search ~. ipv6.dns-priority -50

Prevent traffic leaks on OpenWrt client isolating VPN interface in a separate firewall zone.

uci -q delete firewall.vpn
uci set firewall.vpn="zone"
uci set firewall.vpn.name="vpn"
uci set firewall.vpn.input="REJECT"
uci set firewall.vpn.output="ACCEPT"
uci set firewall.vpn.forward="REJECT"
uci set firewall.vpn.masq="1"
uci set firewall.vpn.mtu_fix="1"
uci add_list firewall.vpn.network="vpn"
uci del_list firewall.wan.network="vpn"
uci -q delete firewall.@forwarding[0]
uci set firewall.lan_vpn="forwarding"
uci set firewall.lan_vpn.src="lan"
uci set firewall.lan_vpn.dest="vpn"
uci commit firewall
service firewall restart

Set up multi-client VPN server. Use unique credentials for each client.

# Configure VPN service
uci -q delete pptpd.client1
uci set pptpd.client1="login"
uci set pptpd.client1.username="${VPN_USER}"
uci set pptpd.client1.password="${VPN_PASS}"
uci commit pptpd
service pptpd restart

Automated VPN server installation.

cat << EOF > pptp-server.sh
$(wget -U "" -O - "${URL}?codeblock=0")
$(wget -U "" -O - "${URL}?codeblock=1")
$(wget -U "" -O - "${URL}?codeblock=2")
sh pptp-server.sh
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  • Last modified: 2023/10/29 01:04
  • by vgaetera