Configuring Non-Standard Internal Ftp Server - H3C S7500 Series Operation Manual

Operation Manual – NAT, Netstream, Policy Routing
H3C S7500 Series Ethernet Switches
Note:
If the public IP address you configured for an internal server is the VLAN interface
address on the NAT device, you cannot ping through the internal server (which acts
as an ICMP server) from the NAT device with the public IP address. However, you
can avoid this problem by specifying a source IP address with the -a keyword in the
ping command.
Currently, secondary address translation on a NAT connection is not supported.
The internal hosts can only access the internal servers through the private IP
addresses instead of the public IP addresses of the servers (the public ones are
used for external users to access the internal servers).
To use the NetMeeting software or enable an internal FTP server, you need to
configure both the nat server and nat outbound commands. For details, refer to
section
For an FTP, TFTP, MSN voice, ILS, or H.323 internal server, besides using the nat
server command to configure the translation from an external IP address to its
internal IP address, you need to use the nat outbound command to configure the
translation from its internal IP address (by referencing an ACL) to the external IP
address (by referencing an address pool that contains only the IP address).

1.3.5 Configuring Non-Standard Internal FTP Server

Different from standard internal FTP servers, non-standard internal FTP servers can
use extended private ports.
Standard internal FTP servers can use ports 0 through 12,287 as their public ports,
and only port 21 as their private ports.
Non-standard internal FTP servers can use ports 0 through 12,287 as their public
ports (same with standard internal FTP servers), and ports 0 through 65,535 as
their private ports.
Caution:
Among ports 0 through 65,535, any well-known ports other than port 21 cannot be used
as the private ports of non-standard internal FTP servers. (You can see those
well-known ports on CLI by command help.)
Follow these steps to configure a non-standard internal FTP server:
Configuring NAT.
1-10
Chapter 1 NAT Configuration