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NETSH INTERFACE PORTPROXY do not work when doing port redirection between IPv4 and IPv4 addresses.


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Author:

Andrei Ungureanu MVP

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SUMMARY

The Netsh.exe can be used as a port redirector for the TCP protocol.

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SYMPTOMS

Rules for port redirection are set by using <add v4tov4> command but are not working.
 

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CAUSE

Netsh.exe is a tool an administrator can use to configure and monitor Windows-based computers at a command prompt. The Netsh.exe tool direct the context commands you enter to the appropriate helper, and the helper then carries out the command. A helper is a Dynamic Link Library (.dll) file that extends the functionality of the Netsh.exe tool by providing configuration, monitoring, and support for one or more services, utilities, or protocols. The <add v4tov4> command is sent to the IPV6MON.DLL helper, and because of that it will work only if IPv6 protocol is installed.
This is the output of the SHOW HELPER command:
netsh interface portproxy>show helper
Helper GUID                             DLL Filename  Command
--------------------------------------  ------------  -------
{05BB0FE9-8D89-48DE-B7BB-9F138B2E950C}  IPV6MON.DLL     ipv6
{F1EFA7E5-7169-4EC0-A63A-9B22A743E19C}  IPV6MON.DLL       6to4
{F1EFA7E5-7169-4EC0-A63A-9B22A743E19C}  IPV6MON.DLL       isatap
{86A3A33F-4D51-47FF-B24C-8E9B13CEB3A2}  IPV6MON.DLL     portproxy

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RESOLUTION

Install IPv6 protocol.

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MORE INFORMATION

Here is an example on how to use NETSH INTERFACE PORTPROXY to forward all requests that came to local IP on port 25 to 192.168.0.100 on port 80.
c:\>netsh
netsh>interface portproxy
netsh interface portproxy>add v4tov4 listenport=25 connectaddress=192.168.0.100 connectport=80 protocol=tcp
 
A help for NETSH commands for INTERFACE PORTPROXY can be found here:

 

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Keywords: KB555744, kbhowto, kbpubtypecca, kbpubmvp

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Article Info
Article ID : 555744
Revision : 6
Created on : 8/20/2020
Published on : 8/20/2020
Exists online : False
Views : 979