* 透過 AWS 設定 OpenVPN server
* 先看一下 EC2 價格 https://aws.amazon.com/tw/ec2/pricing/
* 首先去申請一台乾淨的 AWS EC2 server , 新使用者可以免費使用 750HR .
* 可以參考網路上的教學文章，把 OpenVPN 安裝設定好。
* How to Setup and Configure an OpenVPN Server on CentOS 6
https://www.digitalocean.com/community/tutorials/how-to-setup-and-configure-an-openvpn-server-on-centos-6
* 在 CentOS 6 架設 OpenVPN Server
http://jamyy.us.to/blog/2013/09/5220.html
* How To Set Up an OpenVPN Server on Ubuntu 16.04
https://www.digitalocean.com/community/tutorials/how-to-set-up-an-openvpn-server-on-ubuntu-16-04
* 本人推薦官方的說明, 比較準確
https://help.ubuntu.com/lts/serverguide/openvpn.html
* 將設定檔及憑證全部設定在設定檔內 , 因為手機 IPHONE 才可安裝
https://community.openvpn.net/openvpn/wiki/IOSinline
* 設定主機的 NAT 轉換 IP , 讓 IP 有可以出去。
root@ip-172-31-10-225:~# cat fire.sh
# --------------------------------------------------------------
#!/bin/bash
# linux firewall rule sample
EXTIF="eth0" # 這個是可以連上 Public IP 的網路介面
INNET="192.168.20.0/24"
export EXTIF INNET
# cleaner rule and set default
iptables -F
iptables -X
iptables -Z
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -A INPUT -i lo -j ACCEPT
iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
# clean NAT table rule
iptables -F -t nat
iptables -X -t nat
iptables -Z -t nat
iptables -t nat -P PREROUTING ACCEPT
iptables -t nat -P POSTROUTING ACCEPT
iptables -t nat -P OUTPUT ACCEPT
# nat
iptables -t nat -A POSTROUTING -s $INNET -o $EXTIF -j MASQUERADE
iptables -A FORWARD -p tcp -m tcp --tcp-flags SYN,RST SYN -m tcpmss --mss 1300:1536 -j TCPMSS --clamp-mss-to-pmtu
# --------------------------------------------------------------
* 設定好的這台主機, 可以跟 AWS 租用固定IP ，也可以使用 IP2DNS 寫入成為 DNS
* awsopenvpn.jangmt.com 這個是我的例子用的 domain name
* AWS 的設定請參考網路上的教學文件, 無法在這裡簡單的說明。
# OpenVPN 設定檔 server.conf
# --------------------------------------------------------------
root@ip-172-31-10-225:/etc/openvpn# grep -v "#" server.conf | grep -v '^$'| grep -v ';'
port 443
proto tcp
dev tun
ca ca.crt
cert server.crt
dh dh2048.pem
server 192.168.20.0 255.255.255.0
ifconfig-pool-persist ipp.txt
push "redirect-gateway def1 bypass-dhcp"
push "dhcp-option DNS 8.8.8.8"
keepalive 10 120
tls-auth ta.key 0
comp-lzo
user nobody
group nogroup
persist-key
persist-tun
status openvpn-status.log
verb 3
mode server
tls-server
#Enable multiple client to connect with same key
duplicate-cn
# --------------------------------------------------------------
# OpenVPN Client 端的 inline 設定檔案, IPHONE 可以使用
# --------------------------------------------------------------
# 參考： https://community.openvpn.net/openvpn/wiki/IOSinline
client
dev tun
remote awsopenvpn.jangmt.com 443
proto tcp
resolv-retry infinite
nobind
comp-lzo
mute 3
persist-key
persist-tun
ns-cert-type server
verb 3
#tls-client
#tls-auth ta.key 1
key-direction 1
-----BEGIN CERTIFICATE-----
...
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
...
-----END CERTIFICATE-----
-----BEGIN RSA PRIVATE KEY-----
...
-----END RSA PRIVATE KEY-----
-----BEGIN OpenVPN Static key V1-----
...
-----END OpenVPN Static key V1-----
# --------------------------------------------------------------
* 使用 OpenVPN 最大的原因是 Iphone , MAC OS 新版的有支援, 且用了一陣子後，發現還滿好用的。
* OpenVPN 客戶端工具
https://openvpn.net/index.php/open-source/downloads.html
* Iphone OpenVPN
https://itunes.apple.com/tw/app/openvpn-connect/id590379981?mt=8
