FTP can transmit files between hosts and it provides users with common FTP commands for file
system management. That is, using an FTP client program not residing on the router, you can
upload or download the files and access the directories on the router; using an FTP client program
residing on the router, you can transfer files to the FTP servers of other devices.
FTP can transmit files between local and remote hosts, and is widely used for version upgrade,
log downloading, file transmission, and configuration saving.
8.1.3 TFTP Method
If network client/server interaction requirements are relatively simple, you can enable the TFTP
service on the router that functions as a TFTP client to access files on a TFTP server.
Trivial File Transfer Protocol (TFTP) is a simple file transfer protocol.
Unlike FTP, TFTP does not have a complex interactive access interface and authentication
control. TFTP is for use in environments where there is no complex interaction between the
client and the server. For example, TFTP is used to obtain a memory image of the system when
the system starts up.
Implementation of TFTP is based on the User Datagram Protocol (UDP).
The client initiates a TFTP transfer. To download files, the client sends a read request packet to
the TFTP server, receives packets from the server, and returns an acknowledgement to the server.
To upload files, the client sends a write request packet to the TFTP server, sends packets to the
server, and receives acknowledgement from the server.
TFTP uses two formats for file transfer:
l Binary format: transfers program files.
l ASCII format: transfers text files.
At present, the AR1200 can only serve as a TFTP client and can only transfer files in binary
format.
8.1.4 SSH Method
Logging in to a remote device using SSH (including STelnet,SFTP) provides secure
communications between the remote device and the router you are logged in to.
SSH Overview
When users on an insecure network use Telnet to log in to the router, the Secure Shell (SSH)
feature provides authentication and keeps data secure. SSH defends the router from IP address
spoofing and other such attacks, and protects the router against the interception of plain text
passwords.
The SSH client function allows users to establish SSH connections with routers serving as SSH
servers or with UNIX hosts.
SSH Client Function
The AR1200 supports the STelnet client function and SFTP client function.
l STelnet client
STelnet is short for Secure Telnet.
Huawei AR1200 Series Enterprise Routers
Configuration Guide - Basic Configuration 8 Accessing Another Device
Issue 04 (2012-05-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
146
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