wget https://github.com/esrrhs/pingtunnel/releases/download/2.5/pingtunnel_linux_amd64.zip
./pingtunnel-by-esrrhs -type server
不过这是运行在前台的命令。我们可以利用boa把它运行到后台：
boa /root/pingtunnel-by-esrrhs -type server && reboot
服务器端搭建完成。
在本地机器mac上。首先安装go环境，然后，
mkdir pingtunnel_darwin_amd64
mv pingtunnel_darwin_amd64.zip pingtunnel_darwin_amd64
cd pingtunnel_darwin_amd64
unzip pingtunnel_darwin_amd64.zip
./pingtunnel -h
显示：
通过伪造ping，把tcp/udp/sock5流量通过远程服务器转发到目的服务器上。用于突破某些运营商封锁TCP/UDP流量。
By forging ping, the tcp/udp/sock5 traffic is forwarded to the destination server through the remote server. Used to break certain operators to block TCP/UDP traffic.
Usage:
// server
pingtunnel -type server
// client, Forward udp
pingtunnel -type client -l 127.0.0.1:53 -s SERVER_IP -t 8.8.8.8:53
// client, Forward tcp
pingtunnel -type client -l 127.0.0.1:2299 -s SERVER_IP -t TARGET_SERVER_IP:port -tcp 1
// client, Forward sock5, implicitly open tcp, so no target server is needed.
pingtunnel -type client -l 127.0.0.1:2299 -s SERVER_IP -sock5 1
-type 服务器或者客户端
client or server
服务器参数server param:
-key 设置的密码，默认0
Set password, default 0
-nolog 不写日志文件，只打印标准输出，默认0
Do not write log files, only print standard output, default 0 is off
-noprint 不打印屏幕输出，默认0
Do not print standard output, default 0 is off
-loglevel 日志文件等级，默认info
log level, default is info
-maxconn 最大连接数，默认0，不受限制
the max num of connections, default 0 is no limit
-maxprt server最大处理线程数，默认100
max process thread in server, default 100
-maxprb server最大处理线程buffer数，默认1000
max process thread's buffer in server, default 1000
-conntt server发起连接到目标地址的超时时间，默认1000ms
The timeout period for the server to initiate a connection to the destination address. The default is 1000ms.
客户端参数client param:
-l 本地的地址，发到这个端口的流量将转发到服务器
Local address, traffic sent to this port will be forwarded to the server
-s 服务器的地址，流量将通过隧道转发到这个服务器
The address of the server, the traffic will be forwarded to this server through the tunnel
-t 远端服务器转发的目的地址，流量将转发到这个地址
Destination address forwarded by the remote server, traffic will be forwarded to this address
-timeout 本地记录连接超时的时间，单位是秒，默认60s
The time when the local record connection timed out, in seconds, 60 seconds by default
-key 设置的密码，默认0
Set password, default 0
-tcp 设置是否转发tcp，默认0
Set the switch to forward tcp, the default is 0
-tcp_bs tcp的发送接收缓冲区大小，默认1MB
Tcp send and receive buffer size, default 1MB
-tcp_mw tcp的最大窗口，默认20000
The maximum window of tcp, the default is 20000
-tcp_rst tcp的超时发送时间，默认400ms
Tcp timeout resend time, default 400ms
-tcp_gz 当数据包超过这个大小，tcp将压缩数据，0表示不压缩，默认0
Tcp will compress data when the packet exceeds this size, 0 means no compression, default 0
-tcp_stat 打印tcp的监控，默认0
Print tcp connection statistic, default 0 is off
-nolog 不写日志文件，只打印标准输出，默认0
Do not write log files, only print standard output, default 0 is off
-noprint 不打印屏幕输出，默认0
Do not print standard output, default 0 is off
-loglevel 日志文件等级，默认info
log level, default is info
-sock5 开启sock5转发，默认0
Turn on sock5 forwarding, default 0 is off
-profile 在指定端口开启性能检测，默认0不开启
Enable performance detection on the specified port. The default 0 is not enabled.
-s5filter sock5模式设置转发过滤，默认全转发，设置CN代表CN地区的直连不转发
Set the forwarding filter in the sock5 mode. The default is full forwarding. For example, setting the CN indicates that the Chinese address is not forwarded.
-s5ftfile sock5模式转发过滤的数据文件，默认读取当前目录的GeoLite2-Country.mmdb
The data file in sock5 filter mode, the default reading of the current directory GeoLite2-Country.mmdb
sudo ./pingtunnel -type client -l 127.0.0.1:53 -s my-vps-ip -t 8.8.8.8:53
实际使用例子：
sudo wg-quick up wg0
sudo networksetup -setdnsservers "Wi-Fi" 127.0.0.1
sudo ./pingtunnel -type client -l :53 -s my-vps-ip -t 8.8.8.8:53
项目地址：https://github.com/esrrhs/pingtunnel
这个pingtunnel-by-esrrhs程序用来解决dns污染问题很好用，比simple-dns-by-wynemo：
但是pingtunnel-by-esrrhs运行一段时间后，可能变得不正常.
利用pingtunnel-by-esrrhs翻墙（可能会突然翻墙失败，估计原因是未加密的连接）
mkdir pingtunnel_darwin_amd64
mv pingtunnel_darwin_amd64.zip pingtunnel_darwin_amd64
cd pingtunnel_darwin_amd64
unzip pingtunnel_darwin_amd64.zip
./pingtunnel -h
sudo ./pingtunnel -type client -l 127.0.0.1:2299 -s SERVER_IP -sock5 1
不要关闭此终端，然后设置浏览器的socks5 proxy address为127.0.0.1 ，端口为2299，浏览器即可翻墙。
=========================
以上是下载可执行文件来执行。也可通过go get的办法来编译：
cd $GOPATH
GO111MODULE=off go get -u -v github.com/esrrhs/pingtunnel/
which pingtunnel
显示：
/root/go1.16/go/gopath/bin/pingtunnel
说明编译pingtunnel成功。
