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📁 FTP Server Setup & Configuration on Linux (Complete Guide)

*Install, Configure, Secure & Understand FTP (Active vs Passive) in Real-World Linux Environments

• Linux Administration | Networking | File Transfer

**Non-member= Click!**

🔍 What Is FTP?

FTP (File Transfer Protocol) is a standard network protocol used to transfer files between a client and a server over TCP.

• Default Ports
• Control channel: 21
• Data channel: 20 (Active FTP) or High ports (Passive FTP)

🎯 What Problem Does FTP Solve?

FTP is used when:

• Files need to be shared between systems
• Large data transfers are required
• Applications upload/download data
• Centralized file repositories are needed

Common real-world use cases:

• Application log sharing
• Media & backup transfers
• Internal file sharing
• Legacy system integrations

🔄 FTP vs NFS vs Filesystem

🧠 FTP Applications

Linux FTP Servers

• WUFTP
• VSFTPD ✅ (Very Secure FTP Daemon—recommended)
• SFTP (over SSH—most secure)
• ProFTPD

Windows FTP Servers

• IIS FTP Server
• FileZilla Server

🛠️ Installing VSFTPD on Linux

yum install vsftpd -y

FTP Root Directories

/var/ftp        # FTP root
/var/ftp/pub    # Public directory

🔎 Verify VSFTPD Installation

rpm -qa | grep -i vsftpd
rpm -qi vsftpd
rpm -ql vsftpd

Important Files

▶️ Start & Enable FTP Service

/etc/init.d/vsftpd restart
chkconfig vsftpd on

💡 Starting a service means loading the binary into RAM

👥 FTP User Types

1. Anonymous User — No username/password
2. Local User (VLU) — Linux system users
3. Virtual User — App-specific FTP users

🔐 Securing FTP (Disable Anonymous Access)

Backup Config

cp /etc/vsftpd/vsftpd.conf /etc/vsftpd/vsftpd.conf.default

Edit Configuration

vi /etc/vsftpd/vsftpd.conf

Recommended Secure Settings

anonymous_enable=NO
local_enable=YES
write_enable=YES
chroot_local_user=YES
local_umask=022
xferlog_enable=YES
xferlog_file=/var/log/xferlog
listen=YES
userlist_enable=YES
tcp_wrappers=YES

Restart service after changes:

systemctl restart vsftpd

🚫 Block FTP Users

vi /etc/vsftpd/ftpusers
vi /etc/vsftpd/user_list

Add usernames to deny access.

🌐 TCP vs UDP (Networking Basics)

🔍 Check FTP Port Status

netstat -anp | grep 21
lsof -i :21
nmap -sT localhost

🔁 Active vs Passive FTP (Interview Favorite)

🔴 Active FTP

• Client → Server (21)
• Server → Client (20 → high port)
• ❌ Fails behind NAT/firewalls

🟢 Passive FTP (Default in Linux)

• The clientClient initiates all connections
• Firewall-friendly
• ✅ Recommended

📥 FTP Client Tools

GUI

• FileZilla (Windows/Linux)
• gFTP
• Kasablanca

CLI

ftp <server-ip>
lftp <server-ip>

Common FTP Commands

mget file     # download
mput file     # upload
ls
cd
help

📂 Anonymous vs Regular FTP

🔥 FTP & Firewall Issues (Real-World)

FTP often breaks due to:

• Dynamic ports
• NAT restrictions
• Active FTP callbacks

✅ Solution

• Use Passive FTP
• Allow port ranges in the firewall.
• Prefer SFTP for production

VSFTPD is a stable, secure, and widely used FTP server for Linux. Understanding:

• Active vs Passive FTP
• User types
• Chroot & permissions
• Ports & firewalls

…is critical for Linux admins, DevOps engineers, and network engineers.

Thank you..! 😊

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