File transfer protocol FTP is a popular application-layer protocol that is used for file transfers across TCP networks. FTP supports two modes: active and passive. These modes use different connection mechanisms, and each require different firewall configurations to allow access. This article discusses the differences between these modes and the necessary firewall configurations for Cisco Meraki MX Security Appliances. The source port is a random, high-numbered port. The destination port is Firewall rules must be constructed to allow inbound connections on port 21 and Additional information about constructing firewall rules can be found here , and the following example below details a NAT rule that allows inbound connections to an internal FTP server.
By default, MX appliances allow all outbound connections, so no additional firewall configuration is necessary. One element is the FTP port. Successful file transfers can only happen when the correct ports are open. In terms of FTP, ports are communication endpoints.
Ports allow the connection and transfer of data to happen between your computer and a server. While that IP address identifies a particular server, ports are numbers that are used at a lower level to specify what application or service on the server you are trying to communicate with.
IP addresses are unique on the internet to the one server they are assigned to, but ports are a fixed range of numbers from 0 to that each server uses. For common services, there is an expected, set port that the application should be using. The first ports are reserved for known special services. Go to the ALG page. The FTP Service page opens. Configure the FTP protocol settings. The server uses port 21 for secured and unsecured services.
Once the connection is established, the server uses the configured SSL certificates and selected TLS configuration to secure the connection. Port number Specify the FTP port number. Enable anonymous Click Yes to allow a user to log in anonymously instead of as a user defined ID. Configure the FTP connection limitation. Specify the maximum number of allowed FTP connections. Specify the maximum number of connections per FTP user. Configure the FTP transfer speed limitations.
Click Enable FTP transfer limitation. Remove the USB cable and reinsert it. In the dialog box that is displayed, set the parameters related to port mapping. You can use the following links to configure port forwarding: How to configure port mapping on Huawei ONT If the configuration is still unsuccessful, please timely feedback.
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