在FreeBSD上配置OpenVPN服务器及客户端

本示例代码示范如何在FreeBSD上使用OpenVPN搭建服务器及客户端，并进行配置文件的编写和配置。

安装OpenVPN：
pkg install openvpn

生成证书：
cd /usr/local/etc/openvpn
mkdir keys
chmod 700 keys
cd keys
openssl genrsa -out server.key 2048
openssl req -new -key server.key -out server.csr
openssl x509 -req -days 365 -in server.csr -signkey server.key -out server.crt
openssl dhparam -out dh2048.pem 2048
openvpn --genkey --secret ta.key

创建配置文件：
cp /usr/local/share/examples/openvpn/sample-config-files/server.conf /usr/local/etc/openvpn/
vi /usr/local/etc/openvpn/server.conf

修改如下参数：
local [服务器IP]
port [端口号]
proto udp
dev tun
ca /usr/local/etc/openvpn/keys/server.crt
cert /usr/local/etc/openvpn/keys/server.crt
key /usr/local/etc/openvpn/keys/server.key
dh /usr/local/etc/openvpn/keys/dh2048.pem
tls-auth /usr/local/etc/openvpn/keys/ta.key 0
server 10.8.0.0 255.255.255.0
ifconfig-pool-persist ipp.txt
client-to-client
keepalive 10 120
comp-lzo
persist-key
persist-tun
status openvpn-status.log

启动OpenVPN：
service openvpn onestart

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