{
    "server": {
        "host": "0.0.0.0",
        "port": 8388,
        "interface": "eth0",
        "virtual_network": "10.0.0.0/16"
    },
    "protocols": {
        "shadowsocks": true,
        "l2tp": true,
        "pptp": true
    },
    "offline_access": {
        "enabled": true,
        "timeout": 604800,
        "max_offline_sessions": 5
    },
    "internet_sharing": {
        "enabled": true,
        "rate_limit": "10mbps",
        "allowed_ports": ["80", "443", "53", "22"]
    },
    "security": {
        "encryption": "aes-256-gcm",
        "ipsec_psk": "your_pre_shared_key_here",
        "certificate_path": "/path/to/server.crt",
        "key_path": "/path/to/server.key"
    },
    "logging": {
        "level": "info",
        "file": "/var/log/vpn-server.log"
    }
}