ports.txt

伯克利做的SFTP安全文件传输协议

ports.txt
Summary of ports relevant to SafeTP

20

  Traditionally, outgoing FTP data connections are supposed to be
  bound to local port 20, as a weak form of authentication.  Since this
  precludes sftpd running as non-root, sftpd does *not* adhere to this,
  and simply binds to whatever the OS gives it.

21

  Port 21 is the usual FTP port.  In the normal install, sftpd instead
  listens to this port.

351

  The normal FTP daemon, ftpd, should be moved to listen to 351.
  (Formerly, we had used 221 for this purpose.)

353

  For installs where port 21 is not usable, an alternative (but still
  protected, <1024) port is needed.  353 is our recommendation.

2123

  For testing sftpd, running it as non-root, it must listen to a
  non-protected port.  2123 is what we usually use for this.