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VPN

PPTP

PPTP in LAN not working

LAN 網路的電腦無法連接外網的 PPTP VPN Server

解決：OpenWRT 預設不支援 PPTP 連線，需安裝 kmod-nf-nathelper-extra。

opkg update
opkg install kmod-nf-nathelper-extra

  重啟設備後，重新再試一次。

OpenVPN

OpenVPN Server

Preparation

# Install packages
opkg update
opkg install openvpn-openssl openvpn-easy-rsa luci-app-openvpn luci-i18n-openvpn-zh-tw

Generate PKI (Public Key Infrastructure)

# Configuration parameters
cat << EOF > /etc/profile.d/50-openvpn-easy-rsa.sh
export EASYRSA_PKI="/etc/openvpn/pki"
export EASYRSA_TEMP_DIR=${EASYRSA_TEMP_DIR:-${TMPDIR:-/tmp/}}
export EASYRSA_CERT_EXPIRE="3650"
export EASYRSA_BATCH="1"
EOF
. /etc/profile.d/50-openvpn-easy-rsa.sh

# Remove and re-initialize PKI directory
easyrsa init-pki
 
# Generate DH parameters
easyrsa gen-dh
 
# Create a new CA
easyrsa build-ca nopass
 
# Generate server keys and certificate
easyrsa build-server-full server nopass
openvpn --genkey tls-crypt-v2-server ${EASYRSA_PKI}/server.pem
 
# Generate client keys and certificate
easyrsa build-client-full client nopass
openvpn --tls-crypt-v2 ${EASYRSA_PKI}/server.pem \
--genkey tls-crypt-v2-client ${EASYRSA_PKI}/client.pem

OpenVPN  Service Configuration

  1. LuCI UI → VPN → OpenVPN → Delete : custom_config/sample_server/sample_client
  2. LuCI UI → VPN → OpenVPN → Add : Template based configuration
    • Name : ovpnServer
    • Template : Server configuration for a routed multi-client VPN
  3. LuCI UI → VPN → OpenVPN → Edit : ovpnServer
    • server : 10.9.8.0 255.255.255.0  ( 用戶端 tun 介面網段)
    • ca : /etc/openvpn/pki/ca.crt 
    • dh : /etc/openvpn/pki/dh.pem
    • cert : /etc/openvpn/pki/issued/server.crt
    • key : /etc/openvpn/pki/private/server.key
    • port : 1194
    • proto : UDP
    • dev_type : tun
    • client_to_client : check
  4. LuCI UI → VPN → OpenVPN → Edit : ovpnServer (Advanced configuration)
    1. Cryptography
      • tls_crypt_v2 : /etc/openvpn/pki/server.pem
    2. Networking
      • persist_tun : check
      • persist_key : check
      • topology : subnet
    3. VPN
      • client_to_client : check
      • duplicate_cn : check
      • push : route 192.168.8.0 255.255.255.0  (主機端 LAN 網段)
      • push : redirect-gateway

Firewall Configuration

  1. LuCI UI → Network → Firewall → Traffic Rules → Add: 
    • Name : Allow-OpenVPN
    • Protocol : UDP
    • Source zone : wan/wan6
    • Destination zone : Device (input)
    • Destination port : 1194
    • Action: accept
  2. LuCI UI → Network → Firewall → General Settings → Edit: lan → Advances Settings 
    • Covered devices : tun0

    Generate client configuration file

    VPN_CONF="/etc/openvpn/client.ovpn"
VPN_SERV="192.168.0.12"
VPN_PORT="1194"
VPN_PROTO="udp"
VPN_TC="$(cat /etc/openvpn/pki/server.pem)"
VPN_KEY="$(cat /etc/openvpn/pki/private/server.key)"
VPN_CERT="$(openssl x509 -in /etc/openvpn/pki/issued/server.crt)"
VPN_CA="$(openssl x509 -in /etc/openvpn/pki/ca.crt)"
cat << EOF > ${VPN_CONF}
remote ${VPN_SERV} ${VPN_PORT} ${VPN_PROTO}
dev tun
nobind
client
auth-nocache
remote-cert-tls server
<tls-crypt-v2>
${VPN_TC}
</tls-crypt-v2>
<key>
${VPN_KEY}
</key>
<cert>
${VPN_CERT}
</cert>
<ca>
${VPN_CA}
</ca>
EOF

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