Since Windows XP there is a built-in ability in Microsoft Windows to set up network ports forwarding. Due to it, any incoming TCP connection (IPv4 or IPv6) to local port can be redirected to another local port or even to port on the remote computer. And it is not necessary for system to have a service that listens to this port.
In Linux, port redirection is configured quite simply using iptables. On Windows Server systems, the Routing and Remote Access Service (RRAS) is used to organize port forwarding. However, there is an easier way to configure the port forwarding, which works well in any version of Windows.
Port forwarding in Windows can be configured using Portproxy mode of the command Netsh. The syntax of this command is as follows:
where
netsh interface portproxy add v4tov4 listenaddress=localaddress listenport=localport connectaddress=destaddress connectport=destport
where
- listenaddress – is a local IP address waiting for a connection.
- listenport – local listening TCP port (the connection is waited on it).
- connectaddress – is a local or remote IP address (or DNS name) to which the incoming connection will be redirected.
- connectport – is a TCP port to which the connection from listenport is forwarded to.
Let’s imagine that our task is to make the RDP service to respond on a non-standard port, for example 3340 (the port can be changed in the settings of the service, but we will use RDP to make it easier to demonstrate forwarding). To do this, you need to redirect incoming traffic from TCP port 3340 to another local port – 3389 (standard rdp port).
After setting up the port forwarding rule, we are done with the router, and we can close the web interface. However, we also need to allow the port of our choice on the Windows Firewall, for the port forwarding to work. The fastest way to get access to the Windows Firewall is by pressing the Windows key + R and typing wf.msc at the Run window. Com Port Redirector (CPR) v4 and TruPort® Technology. Windows Terminal Services allows administrators to install, configure, manage and maintain applications centrally on a few servers. This saves time and is much easier than deploying applications on hundreds or thousands of desktop machines at different sites across an enterprise. Apr 13, 2013 Redirect System Windows Proxy:Port Hi all, I'm using my custom proxy:port to connect internet. Download game perang. I can set my custom proxy:port in browser or other app that can be set up. But as for windows system app, that doesn't work.
Start the command prompt as an administrator and perform the following command:
netsh interface portproxy add v4tov4 listenport=3340 listenaddress=10.1.1.110 connectport=3389 connectaddress=10.1.1.110
Where 10.10.1.110 – the current IP address of this computer.
Using netstat make sure that port 3340 is listened now:
netstat -ano | findstr :3340
iphlpsvc (IP Helper) service running on your system.
IPv6 support must be enabled on the network interface for which the port forwarding rule is created.
These are the prerequisites for correct port-forwarding. Without the IP Helper service and without IPv6 support enabled, the port redirection won’t work.
You can find out what process is listening to this port use its PID (in our example, the PID is 636):
tasklist | findstr 636
Let’s try to connect to this computer from a remote system using any RDP client. Port 3340 should be specified as the RDP port.It is specified after the colon following the RDP server address, for example, 10.10.1.110:3340:
The connection should be established successfully.
Important. Make sure that your firewall (Windows Firewall or a third-party one that are often included into an antivirus software) allows incoming connections to the new port. If necessary, you can add a new Windows Firewall rule using this command:netsh advfirewall firewall add rule name=”forwarded_RDPport_3340” protocol=TCP dir=in localip=10.1.1.110 localport=3340 action=allow
When creating an incoming firewall rule for port 3340 via Windows Firewall graphical interface, no program needs to be associated with it. This port is only listened by the network driver.
You can create any number of Windows port forwarding rules. All netsh interface portproxy rules are persistent and are stored in the system after a Windows restart.
Display the list of forwarding rules in the system:
netsh interface portproxy show all
In our case there is only one forwarding rule from port 3340 to 3389:
Listen on ipv4: Connect to ipv4:
Address Port Address Port
--------------- ---------- --------------- ----------
10.1.1.110 3340 10.1.1.110 3389
Tip. Also, portproxy settings can be obtained as follows:
netsh interface portproxy dump
#
# Port Proxy configuration
#
pushd interface portproxy
reset
add v4tov4 listenport=3340 connectaddress=10.1.1.110 connectport=3389
popd
# End of Port Proxy configuration
To remove a specific port forwarding rule:
netsh interface portproxy delete v4tov4 listenport=3340 listenaddress=10.1.1.110
To clear all current port forwarding rules:
netsh interface portproxy reset
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Important. This forwarding scheme works only for TCP ports. You won’t be able to forward UDP ports this way. Also you can’t use 127.0.0.1 as connect address.
If you want to forward an incoming TCP connection to another computer, the command can look like this:
netsh interface portproxy add v4tov4 listenport=3389 listenaddress=0.0.0.0 connectport=3389 connectaddress=192.168.100.101
This rule will redirect all incoming RDP requests (to port 3389) from this computer to a remote computer with an IP address 192.168.1.101.
Another portproxy feature is an opportunity to make it look like any remote network service is operating locally.
For example, forward the connection from the local port 5555 to the remote address 157.166.226.25 (CNN website):
netsh interface portproxy add v4tov4 listenport=5555 connectport=80 connectaddress= 157.166.226.25 protocol=tcp
Now if you go to http://localhost:5555/ in your browser, CNN Start page will open. So despite the browser addresses the local computer, it opens a remote page.
Port forwarding can also be used to forward a port from an external address of a network card to a virtual machine port running on the same computer.
Also, there were cases when in Windows Server 2012 R2 the port forwarding rules worked only until the system was rebooted, and after restart they were reset. In this case, you need to check whether there is a periodic disconnection on the network interface, and whether the IP address changes when the OS boots (it is better to use a static IP). As a workaround, I had to add a script to the Windows scheduler with the netsh interface portproxy rules that run on the system startup.
In Windows Server 2003 / XP, you must additionally set the IPEnableRouter parameter to 1 in the registry key HKLMSYSTEMControlSet001ServicesTcpipParameters.
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September 10, 2019Active3 years, 7 months ago
Please can anyone suggest a free application which creates virtual serial ports and any traffic on that port is redirected to given TCP/IP address?
Hemant
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closed as off-topic by fixer1234, Ben N, DavidPostill♦, Mokubai♦Feb 28 '16 at 21:14
This question appears to be off-topic. The users who voted to close gave this specific reason:
- 'Questions seeking product, service, or learning material recommendations are off-topic because they become outdated quickly and attract opinion-based answers. Instead, describe your situation and the specific problem you're trying to solve. Share your research. Here are a few suggestions on how to properly ask this type of question.' – fixer1234, Ben N, DavidPostill, Mokubai
4 Answers
If this is for Windows, then see HW VSP3 - Virtual Serial Port
HW VSP is a software driver that adds a virtual serial port (e.g. COM5) to the operating system and redirects the data from this port via a TCP/IP network to another hardware interface, which is specified by its IP address and port number.
Main Features
- Free, unrestricted Virtual Serial Port driver for any TCP/IP devices
- Compatible with Windows 2000, XP (Win 98, NT) and Windows Vista
- Runs as a standalone application, or as a NT service suitable for servers
- Option to start at Windows startup and minimize to System Tray
- Single-port (free) and multi-port (commercial) version
- Supports RFC 2217, allowing to change remote serial port parameters (such as speed, parity, stop bits) over TCP using NVT
- VSP driver typically operates as a “TCP client”; however, it can also be used as a “TCP server” (useful for GPRS applications)
- Configuration stored in an INI file
- Configuration protected with a password
- Supports UAC (User Account Control – user switching in Windows XP and Vista)
- This software is FREEWARE, as long as you comply with the license terms and conditions
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harrymcharrymc288k1616 gold badges308308 silver badges625625 bronze badges
com0com, Null-modem emulator, also includes COM to TCP redirection.
The Null-modem emulator can be used to provide serial interface for COM port redirectors. For example, with the com2tcp ( COM port to TCP redirector, part of the com0com project ) you can communicate via serial interface with the TCP/IP servers.
T. KaltnekarT. Kaltnekar7,50622 gold badges2424 silver badges2323 bronze badges
I just found TCPCOM32 and there are also some other projects at SourceForge which are doing such a thing.
Also, what operating system?
BobbyBobbyWindows Port Redirect Windows
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Windows Port Redirect Free
I'm using perle trueport to connect to a ser2net server. Trueport is RFC2217 compliant, which means you can use any baudrate you want.
Vincent FenetVincent Fenet