Detailed TFTP usage in Linux

Introduction to FTP protocol
TFTP is the simplest network protocol for downloading remote files, which is implemented in the UDP protocol .

Configuration of Linux server-side Tftp-server
1. Installing the TFTP server
Need to install xinetd (Guardian tftp), TFTP, and Tftp-server 3 software
1) If you have access to the Internet, install it via yum:
sudo yum installxinetd
sudo yum installTFTP
sudo yum installTftp-server
2. Configuring the TFTP server
Modify the/etc/xinetd.d/tftp file to change the Disable=yes to Disable=no. Enable TFTP service
The main is to set the root directory of the TFTP server to open the service. The modified file is as follows:
Service TFTP
{Socket_type =dgram
Protocol =UDP
Wait =yes
User =root
Server =/usr/sbin/in.tftpd
Server_args =-s/home/mike/tftpboot-c
Disable =no
Per_source =11
CPS = 100 2
Flags =ipv4
}
Description: Modify Item server_args=- s <path>-C, where <path> can be changed to the root directory of your tftp-server

the-s parameter specifies that the CHROOT,-C can create a file .
3. Start the TFTP server and turn off the firewall

redhat7+

Systemctl Disable Firewall;systemctl Stop firewall

Systemctl Enable Xinetd;systemctl start xinetd

redhat7-
/etc/init.d/iptables Stop//firewall off
Sudo/sbin/service xinetd Start
or service xinetd restart
/etc/init.d/xinetd start
See boot [OK] on it.
4. Check if the TFTP service is turned on
netstat-a | grep tftp
Show results as
UDP 0 0 *:tftp *:*
Indicates that the service has been turned on, indicating that the TFTP configuration was successful.
5. TFTP use
Copy a file to the TFTP server directory, and then start the TFTP software on the host for a simple test.

Landing
TFTP 192.168.1.2
Tftp>get <download file>
Tftp>put <upload file>
Tftp>q
6. TFTP command usage is as follows
TFTP your-ip-address
"Go to TFTP operation"
Connect: Connecting to a remote TFTP server
Mode: File transfer modes
Put: Uploading Files
Get: Download file
Quit: Quit
VERBOSE: Show detailed processing information
Tarce: Show Package path
Status: Displays current status information
Binary: Binary transfer mode
Ascii:ascii Transfer Mode
REXMT: Set time-out for packet transfer
Timeout: Set the time-out for retransmission
Help: Helpful Information
?: Help Information
7. If "AVC denial, click icon to view" error appears, the file cannot be transferred
Modify the/etc/sysconfig/selinux to set SELinux to disable
Use the command Setenforce 0 to have the SELinux configuration file take effect

Reference:

Http://blog.sina.com.cn/s/blog_6e5e78bf0100qvmi.html

Detailed TFTP usage in Linux