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Topic: Port forwarding

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	Port Forwarding
		Port Forwarding examines the packet header and forwards it on to another host (after a little header rewriting) depending on the destination port.
		In more detail: Port forwarding forwards all packets intended for one forwarding port on the gateway from the external networks to routed on a specified port on one of the internal machines (after a little rewriting of headers).
		If the destination port is a forwarding port but doesn't have an entry in the masquerading table, we create a suitable entry in the table before rewriting the packet and sending it out.
	www.ox.compsoc.net /~steve/portforwarding.html (856 words)

	SSH Port Forwarding
		Forwards can be confusing - we typically think of connections as being made up of four things - the local IP and port, and the remote IP and port.
		In the forward definition you create, you only have three things because the first port is always either the SSH client or server machine, and thus isn't specified.
		Port forwards bind a port on either the ssh client (Local Forwards) or ssh server (Remote Forwards).
	www.securityfocus.com /infocus/1816 (1851 words)

	SSH: Port Forwarding
		It works similarly to generic port forwarding, except that the FTP forwarding code monitors the forwarded FTP control channel and dynamically creates new port forwardings for the data channels as they are requested.
		Since the port forwarding is opened to a local host address, the FTP client must be run on the same machine as the Secure Shell client if passive mode is used.
		Since the port forwarding is made to a local host address on the Secure Shell client machine, the FTP client must be run in the same host as the Secure Shell client if passive mode is used.
	www.ssh.com /support/documentation/online/ssh/adminguide/32/Port_Forwarding.html (959 words)

	WinMX World :: Port Forwarding Basics
		Port Forwarding is the process of allowing your computer or an application to use certain ports for communicating.
		Port Forwarding rules will only work for one computer at a time, so if your planning on using more than one of your computers for the same program you need to use different ports for each internal IP.
		Port triggering allows you to do port forwarding, but only have the ports open when you are running the application.
	www.winmxworld.com /tutorials/port_forwarding.html (1930 words)

	SSH: Local And Remote Forwarding
		For example, all traffic coming to port 1234 on the client could be forwarded to port 23 on the server (host).
		Remote port forwarding does the opposite: it forwards traffic coming to a remote port to a specified local port.
		For example, all traffic coming to port 1234 on the server (host) could be forwarded to port 23 on the client (localhost).
	www.ssh.com /support/documentation/online/ssh/winhelp/32/Local_And_Remote_Forwarding.html (146 words)

	Port Forwarding Explained
		Port Forwarding is the technique of taking packets destined for a specific TCP of UDP port and machine, and 'forwards' them to a different port and/or machine.
		They connect to a port on a machine when in actually fact the packets are being redirected elsewhere.
		What wouldn't work is if you tried to use Guidedog to forward a port belonging to machine B. Packets passing through Guidedog would be affected, but the port forward would not packets from machine A because machine A communicates with B directly without going through Guidedog -- they are on the same local network.
	www.simonzone.com /software/guidedog/manual/whatisportforwarding.html (318 words)

	Blizzard Entertainment: Technical Support Site
		Port Forwarding allows incoming packets to be forwarded to the computer they are destined for.
		If forwarding is not used or available, on a network with a DHCP server providing "internal" IP addresses, Battle.net will only "see" packets coming from a single address and send packets back to that one address.
		If the default port of 6112 is used for all computers, the router will not know which computer should get the packets from Battle.net and hosting a game will be impossible.
	www.blizzard.com /support/?id=mall0652p (511 words)

	PORT FORWARDING
		Which is assigning a port on the gateway to accept all connections and forward it to the internal machines port where the service is listening to.
		You can chhose any port on xxx.xxx.xxx.xxx it need not match the port we are forwarding to.
		Verify the port forwaring works by connecting to the port from a machine outside the network.
	www.hackorama.com /network/portfwd.shtml (759 words)

	NDC Logical Firewall - SSH Port Forwarding
		For starters, ssh port forwarding is useful if (and only if) there exists another host to which you can ssh, which (by virtue of its different location on the network) has access to what you want.
		In addition to Static Port Forwarding (described above), the commercial version of SSH version 2 from ssh.com and recent versions of "OpenSSH" and "PuTTY" (both free) have an additional "dynamic" port forwarding option which is implemented as a "socks proxy server".
		Remote port forwarding is sometimes useful for granting temporary access to services on clients which are otherwise unreachable (perhaps the client has an unreachable rfc1918 address behind a NAT or firewall).
	staff.washington.edu /corey/fw/ssh-port-forwarding.html (1875 words)

	Port Forwarding - WRT Wiki (Site not responding. Last check: 2007-11-04)
		Port Forwarding is generally considered when you manually define a rule in the router to send all data received on some range of ports on the internet side (WAN Jack) to a port and IP address on the LAN side (LAN Jacks or Wireless Antennas).
		Triggered port forwarding is not the same as port range forwarding, and works by forwarding requests to a range of ports to the machine that first connected to a remote host on the trigger port.
		As soon as a local computer connects to a remote server on the trigger port, the port range will be forwarded to that local computer.
	www.dd-wrt.com /wiki/index.php?title=Port_Forwarding (1886 words)

	SSH port forwarding (Bitvise)
		SSH port forwarding, or TCP/IP connection tunneling, is a process whereby a TCP/IP connection that would otherwise be insecure is tunneled through a secure SSH link, thus protecting the tunneled connection from network attacks.
		It is important to understand that, in a client-to-server port forwarding rule, the target host address is relative to the SSH server, not the client.
		The port forwarding configuration shown in the above example is strict: it minimizes the exposure of unencrypted data by constraining the SSH client to reside on the same machine as the application client, and the SSH server to reside on the same machine as the application server.
	www.bitvise.com /port-forwarding.html (1238 words)

	Windows 2000 port forwarding
		Port forwarding, also known as port redirection, allows you to specify a particular port on your Windows 2000 server that corresponds with a single, particular computer and open TCP port within your internal network.
		Now, forwarding a port on your server to an individual computer within your inside network is as simple as clicking the Settings button.
		A number of the standard ports-for mail or FTP, for example-are provided by default, in the likely assumption that you may want to put a mail or FTP server behind your firewall and still be able to access it directly.
	searchnetworking.techtarget.com /tip/1,289483,sid7_gci763279,00.html (988 words)

	Port forwarding - AzureusWiki
		This is almost certainly caused by incorrectly forwarded ports from your router or firewall.
		If you see a green smiley or have seen one with the same router/firewall configuration, then port forwarding may not be the culprit.
		Thus, you need to forward one listening port for Azureus and tick both the TCP and the UDP boxes, or make an extra rule, one for each protocol.
	azureus.aelitis.com /wiki/index.php/PortForwarding (495 words)

	Port Forwarding
		Ports are used to separate data that is being sent over the internet.
		For example, when you connect to a website, port 80 is used for the traffic to pass to and from your computer.
		When you set up port forwarding, you are telling your router to automatically send data to a specific device on your network whenever the data enters your network on a certain port.
	www.vonage.com /help.php?article=1098&category=44&nav=3 (601 words)

	Tech Note 1862 - Local Port Forwarding and the Reflection for Secure IT Client
		Port forwarding, or tunneling, allows insecure TCP/IP traffic to be forwarded through a secure SSH connection.
		In the Forward local port field (Forward local field in versions earlier than 6.1), enter a local port number that the Reflection SSH client should listen to for TCP or FTP data requests.
		If the port number entered matches a port that is already configured to listen for another service, the Reflection SSH client will be unable to forward the data.
	support.attachmate.com /techdocs/1862.html (1707 words)

	Port Forwarding
		Port forwarding feature of ssh and sshd allows any TCP or UDP application be made secure by passing their data over the secure ssh-sshd session without any changes to the application.
		To use port forwarding, the client must be configured to monitor multiple ports and which port to forward to on the server, then a Fortress SSH session should be initiated.
		For remote port forwarding, configure the client for remote port forwarding, then initiate the alternate protocol sessions from the server side in the ssh session.
	www.pragmasys.com /Fortress/WebHelp/html/Port_Forwarding.htm (617 words)

	College of Computer and Information Science
		To understand port forwarding, you first have to know what a port is. If we were to use a telephone analogy, the IP address of a machine would be the phone number and the port a phone extension at that number.
		Along those same lines, forwarding ports 25 and 110 for mail, configuring your client (Outlook, Eudora, Mutt, whatever) to connect to your local machine on ports 25 and 110 for sending/receiving mail will in turn connect your client to the remote machine you tunneled to (presumably mail.ccs.neu.edu).
		Note: to forward a remote port to your local machine, if the port you are forwarding to on your machine is < 1024, you will need to have root privileges.
	www.ccs.neu.edu /groups/systems/howto/howto-sshtunnel.html (1337 words)

	Firewall Menu
		Port Forwarding is a service that allows limited access to the internal LANs from outside.
		In most cases, this will be the standard port for the service being offered (80 for web servers, 20 for FTP servers, 25 for mail servers, etc.) If you wish, you may specify a range of ports to forward.
		If you have a port forward with multiple external accesses, when you delete all of the external accesses, the port becomes open to ALL addresses, be careful of this one.
	www.ipcop.org /1.4.0/en/admin/html/section-firewall.html (2669 words)

	Eskimo North Technical Support: SSH Port Forwarding
		Any number of forwards can be setup on a single connection.
		Unix-based servers require "root" permissions to forward locally-priviledged ports (1-1024, I believe), so setting up ports outside this range under a regular user's connection is better for security.
		Using these forwards would entail setting your client's preferences to the appropriate local ports.
	www.eskimo.com /support/ssh-forwarding.html (260 words)

	PF: Traffic Redirection (Port Forwarding)
		In rule #1, port 5000 is redirected to 5000, 5001 to 5001, etc. In rule #2, the entire port range is redirected to port 6000.
		If traffic is forwarded to an internal web server for example, and a vulnerability is discovered in the web server daemon or in a CGI script run on the web server, then that machine can be compromised from an intruder on the Internet.
		A generic TCP proxy can be setup on the firewall, either listening on the port to be forwarded or getting connections on the internal interface redirected to the port it's listening on.
	www.openbsd.org /faq/pf/rdr.html (1602 words)

	Port Forwarding
		Each computer has a number of addresses called ports, and IPTables allows (among other things) connections to these ports to be sent to another computer.
		The most common use of port forwarding that I am aware of is allowing servers to run on machines that would normally be hidden behind a firewall.
		The solution is to add a rule into the FORWARD chain that causes connections from the outside world to port 6346 to not be dropped, but instead to be accepted.
	www.socialhacker.com /howtos/port_forwarding.php (438 words)

	Geek to Live: How to access a home server behind a router/firewall - Lifehacker
		Forwarding sends requests for ports on the outside of your firewall to the right computer on the inside.
		With port forwarding set up, your router knows to forward requests for port 80 (a web server's default port) to the computer with the web server running only - and none of the others on your network.
		Port forwarding is only necessary when you want to expose a service to computers on the Internet outside your firewall.
	www.lifehacker.com /software/feature/geek-to-live-how-to-access-a-home-server-behind-a-routerfirewall-127276.php?mail2=true (538 words)

	Portfwd
		Ports must be specified in a one-by-one basis.
		/ 11000 { localhost => 127.0.0.1:telnet }; 10000 ftp-active-mode-on 127.0.0.1 ftp-passive-mode-on 127.0.0.1 { => localhost:ftp } } udp / UDP packets / { / * All packets on port 10000 are forwarded to 127.0.0.1:11000.
		If you plan to forward data to hosts behind your firewall, you probably want this option turned on, as it allows for your servers to see original addresses of clients.
	portfwd.sourceforge.net (840 words)

	Port Forwarding
		They have 10 port redirects, allowing you to, say, run a web server on an internal computer on port 8080, and receive connections from the internet on port 80 at your WAN IP address.
		The limitation to this seemingly huge number of port forwarded ranges is that only 10 different internal IP addresses can be specified, as each block of 10 port forward ranges points to a single internal IP address.
		The 743GE is conveniently setup, with 14 commonly used services pre-configured and 10 port forwarded ranges, but it simply lacks the huge number of port forwarded ranges that the DrayTek units possess.
	www.users.on.net /~milliken/743GE_vs_2600We_vs_2500We_Review/pages/Port_forwarding/PortForwarding.html (292 words)

	Port Forwarding - ZDoom
		Port Forwarding allows a user to host a multiplayer internet game from behind a Nat Router.
		To understand Port Forwarding, you must first understand a little about how Nat Routers work.
		By default, zdoom uses UDP port 5029 for multiplayer games (this can be changed using the -port command--see Command Line Parameters for more info).
	www.zdoom.org /wiki/index.php?title=Port_Forwarding (735 words)

	Secure forwarding of services with SSH
		ssh has built-in support for intelligent X11 forwarding, and it can also do general forwarding from a port on the local machine to an arbitrary IP and port on the other end.
		This makes your ssh client listen on a given port and forward traffic received there through the tunnel; it instructs the remote sshd to send the traffic to a given IP address and port.
		You can use "ssh -R" to forward a port on the remote machine to the local ssh client.
	csociety.ecn.purdue.edu /~sigos/projects/ssh/forwarding (855 words)

	SSH Tunnelling (Port Forwarding)
		This is a short introduction to SSH tunnelling (also known as "port forwarding").
		While the session is open, redirect all connections to port 7777 on the local machine to port 22 on machine work.
		In addition, because we have used the -L option, the local ssh process accepts local connections to port 7777 and sends all data received on this port through the other port 605 to gate with some marking "this is from tunnel 7777".
	www.rzg.mpg.de /networking/tunnelling.html (676 words)

	What is port forwarding? - A Word Definition From the Webopedia Computer Dictionary (Site not responding. Last check: 2007-11-04)
		In home networking, port forwarding, also called port mapping or punch-through, enables you to create a permanent translation entry that maps a protocol port on your gateway machine to an IP address and protocol port on your private LAN.
		It's a transparent process, meaning network clients cannot see that port forwarding is being done.
		Port forwarding may also be used to aggregate traffic from an application that uses several ports for transactions and consolidate it into one port for reporting the total traffic identified with that application.
	www.webopedia.com /TERM/P/port_forwarding.html (309 words)

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