ange-ftp-local-host-regexp

ange-ftp-local-host-regexp is a variable defined in `ange-ftp.el'.
Its value is

".*"

Documentation:
Regexp selecting hosts which can be reached directly with FTP.

For other hosts the FTP process is started on `ange-ftp-gateway-host'
instead, and/or reached via `ange-ftp-gateway-ftp-program-name'.

You can customize this variable.