## extend tool for ping
pong www.baidu.com
pong www.baidu.com 443
pong www.baidu.com 443 -t 1
pong www.baidu.com 443 -t 1 -k udp
pong -a www.baidu.com -p 443 -k tcp -t 3


## build
cd /root
rm -rf pong
git clone https://git.sre.ink/go/pong.git
cd pong
CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GO111MODULE=on GOPROXY="https://goproxy.cn,direct" go build -v -a -o pong pong.go
rm -rf /usr/bin/pong
mv pong /usr/bin/
pong www.baidu.com 443