OpenConnect client

This article relies on the following:

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.

Encrypt your internet connection to enforce security and privacy.
- Prevent data leak and traffic 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.

Install the packages and specify the VPN client configuration parameters. Fetch server certificate hash.

# Install packages
opkg update
opkg install openconnect
 
# Configuration parameters
OC_IF="vpn"
OC_SERV="SERVER_NAME_OR_IP_ADDRESS"
OC_PORT="4443"
OC_HCERT="SERVER_CERT_HASH"
OC_USER="USERNAME"
OC_PASS="PASSWORD"

Consider VPN network as public and 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="${OC_IF}"
uci add_list firewall.wan.network="${OC_IF}"
uci commit firewall
/etc/init.d/firewall restart

Set up VPN interface.

# Configure network
uci -q delete network.${OC_IF}
uci set network.${OC_IF}="interface"
uci set network.${OC_IF}.proto="openconnect"
uci set network.${OC_IF}.server="${OC_SERV}"
uci set network.${OC_IF}.port="${OC_PORT}"
uci set network.${OC_IF}.serverhash="${OC_HCERT}"
uci set network.${OC_IF}.username="${OC_USER}"
uci set network.${OC_IF}.password="${OC_PASS}"
uci commit network
/etc/init.d/network restart

Provide dynamic connection management if required.

Establish the VPN connection. Verify your client traffic is routed via VPN gateway.

traceroute openwrt.org
traceroute6 openwrt.org

Check your client public IP addresses.

https://ipleak.net/

Make sure there is no DNS leak on the client side.

https://dnsleaktest.com/

Delegate a public IPv6 prefix to the VPN network to use IPv6 by default.

https://ipv6-test.com/

Collect and analyze the following information.

# Restart services
/etc/init.d/log restart; /etc/init.d/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; iptables-save; ip6tables-save
 
# Persistent configuration
uci show network; uci show firewall

OpenConnect client

Introduction

Goals

Command-line interface

1. Preparation

2. Firewall

3. Network

Testing

Troubleshooting