What Is MAC Cloning?

MAC cloning can only be done at your router providing it has those capabilities. Most ISPs assign their IPs based on the MAC address in your equipment. If the MAC address of your router is 00-11-22-33-44-55 and you connect to your ISP, the DHCP server records your MAC and assigns an IP. If you disconnect from the ISP, you lose your IP address. The next time you connect, the DHCP server sees your MAC, looks to see if it has assigned an IP address to you before. If it has and the lease time has not expired, it will most likely give you the same IP address you had before disconnecting. Why clone a MAC address? New MAC address most likely equals new IP. How to clone your MAC and if your router has this feature is dependent on the router itself. You’ll need to find the instructions on the manufacturer’s website. Check out our Router Support page to get started.

Read more: http://www.whatismyip.com/faq/what-is-mac-cloning.asp#ixzz3qGeCM2Px

What is a MAC address?

A MAC address is a physical hardware address assigned to each device that has the capability of connecting to a network. The internet is nothing more than a large network. The MAC address is something that is assigned in the chip on the device and is not something the user can change

Read more: http://www.whatismyip.com/faq/what-is-a-mac-address.asp#ixzz3qGeMubam

What's The Difference Between A Static IP Address And A Dynamic IP Address?

A static IP is one that will never change. A dynamic IP is exactly that, dynamic. It could change frequently, or not change for more than 1 year. It really depends on how the DHCP server that’s assigns the IPs is set up.

Read more: http://www.whatismyip.com/faq/difference-between-static-ip-address-and-dynamic-ip-address.asp#ixzz3qGecUjlI

How To Determine If Your Computer Is Being Assigned The External IP Address

For Windows 2000, XP, and 2003
1. Click Start
2. Click Run
3. Type in cmd and hit ok
4. Type ipconfig and hit enter

For Vista
1. Click Start
2. Click All Programs expand the Accessories menu
3. In the Accessories menu, Right Click Command Prompt and choose Run as administrator
4. Type ipconfig hit enter

Results
If you see an IP that resembles 192.168.n.n then this is an internal IP address assigned by a router. So your router is getting your external IP address. If the IP displayed in the command prompt window matches the one shown on What Is My IP then your computer is being assigned your external IP.

Read more: http://www.whatismyip.com/faq/how-to-determine-if-your-computer-is-being-assigned-the-external-ip-address.asp#ixzz3qGeplYAS

Why does WIMI show a different IP address than ipconfig?

The IP address shown on the What Is My IP home page is your public IP also referred to as your external IP. If your internet connection connects straight in to your computer, then your computer is assigned the external IP address. However, if your computer connects to a router then the computer will most likely get an internal IP address like 192.168.1.100 and your router will get the external IP address. So, from your computer, if you follow the steps in our How to determine if your computer is being assigned the external IP article, you’ll be able to quickly determine your computers IP.

Read more: http://www.whatismyip.com/faq/why-does-WIMI-show-a-different-ip-address-than-ipconfig.asp#ixzz3qGf4RpkP

VMS IP Commands

As the system administrator ("SYSTEM"), one can use and maintain TCP/IP services in various ways. The below are all CLI commands, with DCL. (Note: Exclamation marks, i.e. "!", denote comments.)

To display the current configuration, the most rapid way would be by invoking the following command: $ SHOW NETWORK

With the following, detailed information is shown for the TCP/IP configuration(s) in particular:
$ SHOW NETWORK /FULL "TCP/IP"

(For one thing, it'll also list active ports in use.)

One of the most common and probably the easiest ways of setting up TCP/IP networking, is with the following utility: $ @SYS$SYSROOT:[SYSMGR]TCPIP$CONFIG.COM

Or, via the UNIX-like command: $ TCPIP

So, for example: $ TCPIP IFCONFIG (...) ! whatever ! desired ! options & ! values
$ TCPIP PING 192.168.1.1 ! just as an ! example
$ TCPIP TRACEROUTE GOOGLE.COM ! idem ditto
$ TCPIP NETSTAT -A

All the ethernet adapters should typically be listed as EW* devices, which can be found by typing:
$ SHOW DEVICES EW

With advanced descriptions, add the /FULL qualifier, like so: $ SHOW DEVICES /FULL EW

For just one device, say EWA0: $ SHOW DEVICE /FULL EWA0

Alternatively, this also works: $ TCPIP SHOW INTERFACES /FULL $ TCPIP IFCONFIG -A


Read more: http://www.whatismyip.com/faq/vms-ip-commands.asp#ixzz3qGfJTOJ9

UNIX IP Commands

Display Current Config for all NIC's: ifconfig

Display Current Config for dc0: ifconfig dc0

Assign multiple IP's: ifconfig dc0:0 192.168.1.2

Assign second IP: ifconfig dc0:1 192.168.1.3

Disable network card: ifconfig dc0 down

Enable network card: ifconfig dc0 up

Assign IP/Subnet: ifconfig dc0 inet 192.168.1.2 netmask 255.255.255.0

Assign Gateway: route delete default && route add default 192.168.1.1

*You MUST be at the ROOT user to make/save any changes. You will need to save your changes in the /etc/rc.conf file. Network cards are referred to as dc0, dc1, dc2, etc based on their position on the PCI bus.
*Special thanks to Romanov Sergey Vladimirovich from Moscow for the UNIX commands!

Read more: http://www.whatismyip.com/faq/unix-ip-commands.asp#ixzz3qGfdPNyy