We are very happy to get your reply. Thanks
1.We are just test the port and service , we just want to know if they are work well.
2.We know the ap are upgrade by tftp udp 69 usually, but we can hardly test the udp port from Internet, and we also know netcat can test udp but it's result maybe not right, we test the udp 69 by netcat, it is work well
C:
etcat>nc -uvc 47.104.193.111 69
47.104.193.111: inverse host lookup failed: h_errno 11004: NO_DATA
(UNKNOWN) [47.104.193.111] 69 (tftp) open
3.We khow Tcp service can be test by telnet,So we try to test if the ftp port 21 are work well on our VMC ?
C:
etcat>telnet 47.104.193.111 21
47.104.193.111...21: failed (we delete the Chinese words here)
So we think of if the TCP port 21 are work now ?
So we need to know If there are any body can access the TCP ort 21 from Internet on VMC by telnet xx.xx.xx.xx 21 ?
We can get reply from local netowrk, but no reply from Internet, So we ask this question here to see if anybody know the reason ?