Protocols, such as AppleTalk or Novell's SPX/IPX. The UDP-based DNS, DHCP, NFS, and NetBIOS, or with non-IP-based (See the sidebar "TCP Connections" for an overview of TCP concepts.)įorwarding can't work with protocols not built on TCP, such as You're connected outside the ISP's network and the ISPįorbids mail relaying from your current location. Use your ISP's SMTP servers for sending mail, even if.Protect the data channels that carry the file contents, though. Tunnel the control connection of an FTP session, to encrypt your.That would otherwise be sent in the clear as part of the session. Preventing disclosure or alteration of passwords and other content Provide protection for your sessions with these same TCP servers,.Access various kinds of TCP servers (e.g., SMTP, IMAP, POP, LDAP,Įtc.) across a firewall that prevents direct access.Once you start securing your communications with portįorwarding, you'll wonder how you ever got along without it. Port forwarding can even pass aĬonnection safely through a firewall if you configure things Port forwarding protects arbitrary TCP/IP connections by redirecting In short, with minimal configuration changes to your programs, SSH PGP or S/MIME to sign and/or encrypt the messages themselves. For end-to-endĮmail security, you and your correspondent should use tools such as Other mail servers and may be intercepted in transit. Before reaching your IMAP server, the messages pass through Your IMAP connection but doesn't truly protect your email Port forwarding to provide real protection. The IMAP server machine must be running an SSH server for TCP port 143) to pass through SSH, securely encrypting the data over Transparently reroute the IMAP connection (found on server S's Mail account password transmitted as plaintext between your mail Normally, this connection is insecure, with your Reader, and you want to connect to an IMAP server on machine S to Suppose you have a home machine H that runs an IMAP-capable email Which another TCP/IP connection may pass. The SSH connection provides a secure "tunnel" through Port forwarding is sometimes called tunneling because Running over TCP can be made secure by forwarding the connections Telnet, SMTP, NNTP, IMAP, and other insecure protocols Process, called port forwarding, is largely transparent and quite We will nowĭiscuss a cool feature that encrypts and decrypts TCP/IP trafficīelonging to other applications, on other TCP ports, using SSH. Mechanism, usually TCP port 22 on the server machine, as it encryptsĪnd decrypts the traffic passing over the connection. Port Forwarding SSH uses TCP/IP as its transport
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