OpenConnect client
Introduction
- This how-to describes the method for setting up OpenConnect client on OpenWrt.
- Follow OpenConnect server for server setup and OpenConnect extras for additional tuning.
Goals
- Encrypt your internet connection to enforce security and privacy.
- Prevent traffic leaks and spoofing on the client side.
- Bypass regional restrictions using commercial providers.
- Escape client side content filters and internet censorship.
- Access your LAN services remotely without port forwarding.
Command-line instructions
1. Preparation
Install the required packages. Specify configuration parameters for VPN client.
# Install packages opkg update opkg install openconnect openssl-util # Configuration parameters VPN_IF="vpn" VPN_SERV="SERVER_ADDRESS" VPN_PORT="4443" VPN_USER="USERNAME" VPN_PASS="PASSWORD"
2. Key management
Transfer server certificate to VPN client. Generate certificate hash.
# Generate certificate hash VPN_CERT="server-cert.pem" VPN_HASH="pin-sha256:$(openssl x509 -in ${VPN_CERT} -pubkey -noout \ | openssl pkey -pubin -outform der \ | openssl dgst -sha256 -binary \ | openssl enc -base64)"
Fetch server certificate remotely if necessary.
3. Firewall
Consider VPN network as public. Assign VPN interface to WAN zone to minimize firewall setup.
# Configure firewall uci rename firewall.@zone[0]="lan" uci rename firewall.@zone[1]="wan" uci del_list firewall.wan.network="${VPN_IF}" uci add_list firewall.wan.network="${VPN_IF}" uci commit firewall service firewall restart
4. Network
Set up VPN interface.
# Configure network uci -q delete network.${VPN_IF} uci set network.${VPN_IF}="interface" uci set network.${VPN_IF}.proto="openconnect" uci set network.${VPN_IF}.server="${VPN_SERV}" uci set network.${VPN_IF}.port="${VPN_PORT}" uci set network.${VPN_IF}.username="${VPN_USER}" uci set network.${VPN_IF}.password="${VPN_PASS}" uci set network.${VPN_IF}.serverhash="${VPN_HASH}" uci commit network service network restart
Configure dynamic connection if necessary.
Testing
Establish the VPN connection. Verify your routing with traceroute and traceroute6.
traceroute openwrt.org traceroute6 openwrt.org
Check your IP and DNS provider.
Troubleshooting
Collect and analyze the following information.
# Restart services service log restart; service network restart; sleep 10 # Log and status logread -e openconnect # Runtime configuration pgrep -f -a openconnect ip address show; ip route show table all ip rule show; ip -6 rule show; nft list ruleset # Persistent configuration uci show network; uci show firewall