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WAN Configuration 4-7
4. Specify the outbound FTP actions that should get blocked by checking the FTP action to block. File Transfer Protocol (FTP)
is the Internet standard for host-to-host mail transport. FTP generally operates over TCP on port 21.
5. Click the Apply button to save changes made on this screen.
Configuring Network Address Translation (NAT)
NAT provides the translation of an Internet Protocol (IP) address within one network to a different, known IP address within
another network. One network is designated the private network, while the other is the public. NAT provides a layer of
security by translating private (local) network addresses to one or more public IP addresses. For example, when an
administrator wants to allow individuals on the WAN side access to a particular FTP or web server that is located on one of
the LAN subnets but does not want to permit any other access, NAT is the appropriate solution.
1. Select Network Configuration --> WAN --> NAT from the left menu. The following screen appears.
QUIT (Quit) This command tells the receiver to respond with an OK reply and then terminate communica-
tion with the sender.
SEND (Send) This command initiates a mail transaction where mail is sent to one or more remote termi-
nals.
SAML (Send and Mail) This command initiates a mail transaction where mail data is sent to one or more
local mailboxes and remote terminals.
RESET (Reset) This command cancels the current mail transaction and informs the recipient to discard any
data sent during this transaction.
VRFY (Verify) This command asks the receiver to confirm that the specified argument identifies a user. If
the argument does identify a user the full name and fully qualified mailbox is returned.
EXPN (Expand) This command asks the receiver to confirm that a specified argument identifies a mailing
list. If the argument does identify a mailing list the membership list of that mailing list is returned.
Storing Files Blocks the request to transfer files sent from the client across the switch’s WAN port to the
FTP server.
Retrieving Files Blocks the request to retrieve files sent from the FTP server across the switch’s WAN port to
the client.
Directory List Blocks requests to retrieve a directory listing sent from the client across the switch’s WAN
port to the FTP server.
Create Directory Blocks requests to create directories sent from the client across the switch’s WAN port to the
FTP server.
Change Directory Blocks requests to change directories sent from the client across the switch’s WAN port to the
FTP server.
Passive Operation Blocks passive mode FTP requests sent from the client across the switch’s WAN port to the
FTP server.