Configure a Device as an FTP Server

Network Requirements

• Device1 acts as an FTP server, while PC and Device2 act as FTP clients. The network between the client and the server is normal.
• On the FTP server Device1, the user name is admin1, and the password is admin1. The file system directory of Device1 acts as the root directory of the FTP server.
• PC and Device2 act as the FTP client to upload files to and download files from the FTP server Device1.

Network Topology

Figure 4–2 Networking in Which a Device Acts as an FTP Server

Configuration Steps

Step 1: Create VLANs, and add ports to the required VLANs.(Omitted)

Step 2: Configure the IP addresses of the interfaces so that the network between the PC, Device 2, and Device 1 are normal. (Omitted)

Step 3: On Device1, enable the FTP service, and configure the authorized user name and password.

#On Device1, enable the FTP service, and configure the authorized user name and password.

#On Device1, enable the FTP service.

#On Device1, set the maximum number of concurrent users to 2.

Step 4: Check the result.

#Check whether the FTP service function is enabled on Device1.

Device#show ip sockets 
Active Internet connections (including servers)
PCB      Proto Recv-Q Send-Q  Local Address          Foreign Address                (state)
-------- ----- ------ ------  ---------------------- ----------------------   -------
27cf8a4  TCP        0      0  0.0.0.0.80             0.0.0.0.0                      LISTEN
27ce0a4  TCP        0      0  130.255.104.43.22      130.255.98.2.3590           ESTABLISHED
27d0be4  TCP        0      0  0.0.0.0.21             0.0.0.0.0                      LISTEN
27d0824  TCP        0      0  127.0.0.1.2622         127.0.0.1.1026              ESTABLISHED

If the FTP service function has enabled, you can find that port 21 is in the listen state.

Step 5: Use Device2 as an FTP client to copy a startup file from FTP server Device1 to Device2.

Step 6: Use PC as an FTP client to copy a startup file from FTP server Device1 to PC.

#In the following part, the Windows DOS screens are taken as an example to illustrate the process.

#In the Windows DOS screen, input the correct IP address, user name, and password to log in to the FTP server.

Figure 4-3 Logging in to the FTP Server via the Windows DOS Screen

#Configure the PC and FTP server to transmit data in binary mode.

Figure 4-4 Configuring the PC and FTP Server to Transmit data in Binary Mode

#Obtain the startup file in the file system of the FTP server Device1.

Figure 4-5 Copying a Configuration File from the FTP Server

After the file copy process is completed, the file is available in the specified Windows directory.

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  If the "421 Session limit reached, closing control connection" message is printed, it indicates that the number of connections has exceeds the maximum number allowed by the server.
• When you use a device to copy a file, if the " Ctrl socket connect error(0x3c): Operation timed out" message is printed, the cause may be that the server function is not enabled, or the route between the server and the client is not reachable.
• When you connect the FTP server through the FTP client PC, if the " connect :Unknown error number" is printed, the cause may be that the server function is not enabled, or the route between the server and the client is not reachable.
• As the FTP server, the device is restricted to strict mode. By default, only supporting the passive mode to transmit files. It needs to use security-mode loose to modify the mode to loose mode to support the active mode for transmitting files.

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