sendport

# File lib/net/ftp.rb, line 509
    def sendport(host, port) # :nodoc:
      remote_address = @bare_sock.remote_address
      if remote_address.ipv4?
        cmd = "PORT " + (host.split(".") + port.divmod(256)).join(",")
      elsif remote_address.ipv6?
        cmd = sprintf("EPRT |2|%s|%d|", host, port)
      else
        raise FTPProtoError, host
      end
      voidcmd(cmd)
    end