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FTP Fails After NAT Serve...

FTP Fails After NAT Server Is Configured

Created: Feb 28, 2021 15:24:59Latest reply: Jan 26, 2022 02:40:32 358 3 0 0 0
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Hi,

After NAT Server is configured, the port number of the intranet FTP server is mapped to 8000. Public network users cannot access the intranet server. When an external terminal accesses the FTP server, a message is displayed indicating that the connection times out.

#                                                                              

nat alg ftp enable

#                                                                             

 acl number 2000                                                               

 rule 5 permit source 192.168.0.0 0.0.0.255                                    

#                                                      

interface GigabitEthernet2/0/0                                                

  ip address 10.10.10.2 255.255.255.0                                          

  nat server protocol tcp  current-interface ftp inside 192.168.0.100 8000  

  nat server protocol udp current-interface ftp inside 192.168.0.100 8000 

  nat outbound 2000                                                             

 #  


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Popeye_Wang
Admin Created Feb 28, 2021 15:28:06

Hello,

By default, the router monitors FTP communication ports 20 and 21. After the FTP communication port is changed, the AR cannot monitor the change. As a result, the server IP address of the data channel in subsequent data packets is still a private IP address. As a result, the client cannot route the private IP address, causing service interruption.

Therefore, if the FTP port number is changed, the new port number must be monitored in port mapping mode.

#

acl 2005

 rule permit

#

ftp  port 8000 acl 2005

#

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  • x
  • convention：

kunthea
kunthea Created Jan 26, 2022 02:40:26 (0) (0)
 
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(2) (0)
2#
Popeye_Wang
Popeye_Wang Admin Created Feb 28, 2021 15:28:06

Hello,

By default, the router monitors FTP communication ports 20 and 21. After the FTP communication port is changed, the AR cannot monitor the change. As a result, the server IP address of the data channel in subsequent data packets is still a private IP address. As a result, the client cannot route the private IP address, causing service interruption.

Therefore, if the FTP port number is changed, the new port number must be monitored in port mapping mode.

#

acl 2005

 rule permit

#

ftp  port 8000 acl 2005

#

View more
  • x
  • convention：

kunthea
kunthea Created Jan 26, 2022 02:40:26 (0) (0)
 
(0) (0)
3#
kunthea
kunthea Created Jan 26, 2022 02:40:32

cool
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  • convention：
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