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What's Netsh?
How to run netsh
How to configure the TCP/IP protocol
How to check the connection and opened port
How to use netsh commands for remote access (ras)
How to open port 8080 using netsh
How to switch between static ip and DHCP
How to use Netsh command to troubleshoot NAT issue

Netsh is a command-line scripting utility that allows you to, either locally or remotely, display, modify or script the network configuration of a computer that is currently running. The following examples based on XP SP2.

How to run netsh

To run a netsh command, you can start netsh from the Cmd.exe prompt and change to the context that contains the command you want to use. Or you can do netsh -c option. If the contexts that are not available to you, you may receive an error message. For example, if you type netsh -c firewall at the Netsh command prompt, you change to the firewall context, but if you do not have firewall installed the following message appears:

The following command was not found: firewall.

How to check the connection and opened port
netsh -c diag
netsh diag>connect iphost chicagotech.net 80
Result:
IPHost (chicagotech.net)
IPHost = chicagotech.net
Port = 80
Server appears to be running on port(s) [80]

How to configure the TCP/IP protocol

The following command configures the interface named chicagotechnet with the static IP address 10.0.5.99, the subnet mask of 255.255.255.0, and a default gateway of 10.0.5.1:

set address name="chicagotechnet" source=static addr=10.0.5.99 mask=255.255.255.0 gateway=10.0.5.1 

How to use netsh commands for remote access (ras)

You can administer remote access servers by typing netsh and then ras. Following are some commands manage RAS:

•        show activeservers

•        show client

•        dump

•        show tracing

•        set tracing

•        show authmode

•        set authmode

•        add authtype

•        delete authtype

•        show authtype

•        add link

•        delete link

•        show link

•        add multilink

•        delete multilink

•        show multilink

•        add registeredserver

•        delete registeredserver

•        show registeredserver

•        show user

•        set user

•        Netsh ras diagnostics context commands

•        Netsh ras IP context commands

•        Netsh ras AppleTalk context commands

•        Netsh ras AAAA context commands

How to open port 8080 using netsh

1) netsh -c firewall
2) set portopening tcp 8080

How to switch between static ip and DHCP

To switch the specified adapter from a static address to DHCP, type the following command:
netsh interface ip set address "chicagotechnet" dhcp

To change to a static address, type the following command:
netsh interface ip set address "chicagotechnet" static ipaddr subnetmask gateway metric