常见问题的排查及工具

nmap

You can view the open ports and (guess) os type of ther target ip/domain.

installation: yum install -y nmap

usage: nmap -O -Pn ip/domain
eg, nmap -O -Pn www.baidu.com

hping3

Hping3 is a network tool that can send custom packets and display the target’s response

installation: yum install -y hping3

usage:

echo 'hey, you locked table, please reply Tom when you see' > data.txt
hping3 --flood -P -p 8080 -c 1000000 -d 50 -E data.txt 192.168.1.50