How to enable Sniffer network packets in Linux

Article Title: How to enable Sniffer network packets in Linux. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.

Sometimes it's really annoying to forget the FTP login account and password. I usually remember it in my own FileZilla and won't try again, but it's hard to remember when someone else asks you for a password.

In Linux, you can use tcpdump to perform sniffer operations, but you must log on to the system as the root user. However, people who cannot understand the information they have listened to will think it is garbled. you just need to take a closer look and find out where the password is.

Some common commands are listed below:

Listen to TCP Port 21 connections

# Tcpdump-X 'tcp port 21'

Listen to the connection of TCP Port 80 and write the retrieved "original packet" to the http. log File (this is the original packet data in Binary format)

# Tcpdump-X 'tcp port 80'-w http. log