14.2.1. Introduction¶

SFTPPlus supports listening on IPv6 addresses for incoming SFTP, SCP, FTP, FTPS, HTTP and HTTPS file transfer connections.

IPv6 addresses can also be used for the Web Manager GUI.

The types of IPv6 addresses that are supported are long form addresses:

1111:2222:3333:4444:5555:6666:7777:888

And short form addresses such as:

1111::7777:888

14.2.2. Server Side Connections¶

When a file transfer service is configured to listen on an IPv6 address, it will only accept connections from IPv6 clients.

To support IPv6 and IPv4 clients, you will need to set up 2 separate services, one for IPv6 and another one for IPv4.

For now, only IPv6 address literals are supported. SFTPPlus cannot listen to FQDN resolving to an IPv6 address. This is a known issue and will be fixed in the following releases. Please get in touch if you need this functionality.

14.2.3. Transition from IPv4¶

On certain operating systems such as Linux, when a service is listening on the :: IPv6 address, it will also accept IPv4 connections. These connections are recorded in the audit log using an IPv4-mapped to IPv6 an address. For example, for a client connection from address 192.168.1.48 to port 53260, the recorded peer would be ::ffff:192.168.1.48:53260.