| Filename | Port Forwarding |
| Permission | rw-r--r-- |
| Author | WhySoSeriousssssssssssss |
| Date and Time | 22:50 |
| Label | hack |
| Action |
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Purpose of Port Forwarding
Port forwarding allows remote computers, for example, computers on the Internet, to connect to a specific computer or service within a private local area network (LAN).
In a typical residential network Internet access is obtained through a DSL or cable modem connected to a router or network address translator (NAT/NAPT). Hosts on the private network are connected to an Ethernet switch or communicate via a wireless LAN. The NAT device's external interface is configured with a public IP address. The computers behind the router, on the other hand, are invisible to hosts on the Internet as they each communicate only with a private IP address.
When configuring port forwarding, the network administrator sets aside one port number on the gateway for exclusive use of communicating with a service in the private network, located on a specific host. External hosts must know this port number and the address of the gateway to communicate with the network-internal service. Often, the port numbers of well-known Internet services, such as port number 80 for web services (HTTP), are used in port forwarding, so that common Internet services may be implemented on hosts within private networks.
Typical applications include the following:
- Running a public HTTP server within a private LAN
- Permitting Secure Shell access to a host on the private LAN from the Internet
- Permitting FTP access to a host on a private LAN from the Internet
Port forwarding is configured in the gateway's operating system. In Linux kernels, this is achieved by packet filter rules in the iptables or netfilter kernel components. BSD and Mac OS X operating systems implement it in the Ipfirewall (ipfw) module.
When used on gateway devices, a port forward may be implemented with a single rule to translate the destination address and port. (On Linux kernels, this is DNAT rule). The source address and port are, in this case, left unchanged. When used on machines that are not the default gateway of the machine, the source address must be changed to be the address of the translating machine, or packets will bypass the translator and the connection will fail.
When a port forward is implemented by a proxy process (such as on application layer firewalls, SOCKS based firewalls, or via TCP circuit proxies), then no packets are actually translated, only data is proxied. This usually results in the source address (and port number) being changed to that of the proxy machine.
This tutorial is intended to show you how to open ports on your PC
Go to - My Network Places - View Network Connections
Now right click on the LAN Connection that provides your internet access and select Properties: - Click Advanced - Settings
Now click Advanced - Highlight your internet Connection - Click settings
A window should open similar to the one below but would more than likely have existing ports open on your system listed.
Click Add and you will see a set settings window appear:
Description of Service: Usually the program name (abbr.) and/or the port number being opened.
Name or IP address: Just what is says. If you don't know your PC's name just put the IP address.
NOTE: If you don't have a Static IP address on your PC then everything you're doing can and will be ineffective if and when your IP address changes. Set a Static IP for your system.
External Port/Internal Port number for this service: Unless you know exactly what having two different ports here consist of, keep them the same.
TCP: TCP enables two hosts to establish a connection and exchange streams of data.
UDP: provides very few error recovery services, offering instead a direct way to send and receive datagram's over an IP network.
NOTE: Between TCP & UDP make sure you set the port for the type you need. If one port needs both types then you'll have to the go through these settings twice.
This section was will show you how to forward ports on your router.
First you need to access your router. Open CMD (Command Prompt) and type ipconfig /all (enter)
The gateway IP address is the IP address of your router. Open Internet Explorer and type your router IP address (enter).
A user name and password box should appear like the one below. The factory password for the example router is admin (without the quotes) and leave the user name blank. Some routers may be admin as the user name with the password area blank. Check the documentation that came with your router or refer yourself to the company website to figure out what this is for your router.
NOTE: I highly recommend you changing that password from the factory setting ASAP if it still exists.
Once you type your password the router settings should be displayed
Select Application & Gaming or Advanced - Port Forwarding
(Application) Name: Input a small abbreviation so you know what program you're forwarding the ports for.
Computer Name: Select the computer from your network for port forwarding.
Protocol: Select your protocol TCP or UDP (or both).
IP Address: Here you input your current IP.
Enable: Self Explanatory.
Save your settings and restart your system.
For a list of routers and firewalls with support documents that provide step-by-step guides on how to setup port forwarding http://portforward.com/english/routers/port_forwarding/routerindex.htm
Reliable open port check tool to test if your port is open here
A list of every known default passwords for every router. If you don't know your routers password you can reset it to factory defaults and then use the default password that you find in this list http://portforward.com/default_username_password/
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