When the client connects to the server in passive mode establishes control connection as usual. But for the data connection the client requests the server to open a port that the client can then connect to. The server waits passively for the client, hence the name.
NAT
NAT is a common technique (used in most “broadband routers”) to share a single Internet connection and therefore an IP for multiple computers. NAT means that the addresses in the internal network are translated to addresses in the public (internet). The technology is based on the different ports linking with internal addresses. Such a solution can not be active FTP because the server connects to a port that is not paired with an internal address.
Firewalls
although firewall configuration easier with passive FTP. It is sufficient to allow all traffic initiated from its own network.
Detailed Description
To learn more, see a detailed description of active and passive ftp in the article below.
NAT
NAT is a common technique (used in most “broadband routers”) to share a single Internet connection and therefore an IP for multiple computers. NAT means that the addresses in the internal network are translated to addresses in the public (internet). The technology is based on the different ports linking with internal addresses. Such a solution can not be active FTP because the server connects to a port that is not paired with an internal address.
Firewalls
although firewall configuration easier with passive FTP. It is sufficient to allow all traffic initiated from its own network.
Detailed Description
To learn more, see a detailed description of active and passive ftp in the article below.
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