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What is eMTA MAC address?
Click to see full answer.
Subsequently, one may also ask, what is an eMTA?
The term eMTA means: (e)embedded (M) Multi Media (T) Terminal (A) Adapter. It is a modem with telephone capability. If your cable provider offers telephone service with your internet, this is the device you"ll need. It's just a regular cable modem.
Furthermore, why does my router have two MAC addresses? It all depends on how many interfaces are inside the router. However, if your router itself is showing that it has two MAC addresses as being part of it (it probably has three if it's wireless), then it means there are at least one interface inside your router, which includes the router itself.
Also know, what is CM MAC on router?
The CM MAC (Cable Modem MAC address) and Serial Number of your cable modem are printed on the bottom label.
How much does a cable modem cost?
Cable modems generally are capable of faster speeds than DSL or dial-up modems. Most cable modems are external, although rare internal modems are available. Typical costs: A cable modem costs $40-$90.
The MAC address is one of the two critical elements of networking. You’ll learn all about it in this post.
The first thing to remember is that a MAC address is different from an IP address, though the two co-exist nicely. You can even say they depend on each other.
That said, it’s a good idea that you check out my explainer on the IP address before (or after) this post.
Dong’s note:I first published this post on March 1, 2019, and updated it on January 25, 2021, to include additional relevant information.
What is a MAC address
MAC stands for media access control. So a MAC address — I’ll call it MAC from now on for short — is precisely that, the unique identifier to control the access of a network interface controller (NIC), which we often call a network adapter.
Your device — be it a computer, a tablet, or a phone — can connect to the Internet because it has a NIC. This NIC comes as a Wi-Fi adapter, an Ethernet adapter (wired), or a cellular modem.
A MAC address consists of six groups of two characters (numbers or letters). Depending on where you view the address, these groups are separated by colons, hyphens, or nothing at all.
That said, here is a MAC address as you’d see on a Windows computer:
(This is a random address I made up for this post. If it belongs to an actual device, that’s just a coincidence.)
This same address can also appear as d4:fb:6a:7c:31:b4 or D4FB6A7C31B4, depending on what platform or application you use to view it.
As you might have noticed, MAC is not case-sensitive, but it tends to appear either all lower case or all upper case. Generally, each time you appropriately alter a digit or a letter, you’ll get a new MAC.
Things to keep in mind about MAC
Here are some interesting facts about the MAC address.
- Every network adapter must have a MAC.
- A MAC is unique and permanent. It’s embedded in each networking adapter by the manufacturer. It’s like the vehicle identification number (VIN) of a car.
- Take “permanent” with a grain of salt because, just like a VIN, it’s susceptible to modification. More below.
- Eventually, we’ll run out of MAC addressing space. But considering this is a 48-bit scheme with a total of 281,474,976,710,656 — that’s 281 trillion and then some hundred billion more — possible addresses, it’s safe to say many things more consequential, like humanity or hopefully just the need for the MAC itself, would expire before we have to worry about a MAC shortage.
- There are many other names for a MAC address. Here are a few examples: Physical address, basic service set identifier (BSSID), Ethernet hardware address (EHA), hardware address, and adapter address.
Generally, a device has its MAC on its label. It’s not a secret; everyone can see it — again, it’s like the VIN of a car, it must be visible. Once the device is yours, however, it’s a good idea to keep this address secure. You’ll know why by the end of this post.
Usage: MAC address vs. IP address
If MAC is the VIN of a car, then the IP address is the license plate. Both are used to identify a car but at different levels and purposes. Specifically, you can’t register your vehicle (and get a new license plate) if it doesn’t have a VIN.
The use of a MAC address
A DHCP server (like your router) uses a MAC address to assign an IP address to a network adapter. Without MAC, an adapter can’t get an IP address. Without an IP address, the device can’t connect at all.
You can also use the MAC to reserve a particular IP address for an adapter within a local network. When this happens within the network, the device will get the same IP address each time it connects. This IP reservation feature is quite helpful for advanced network applications.
Conversely, you can also use MAC to deny (or explicitly allow) access to an adapter via MAC filtering, a kind of a security feature. “Kind of” because it’s not absolutely secure since you can actually “change” this address, as shown below.
For the most part, though, a MAC address is permanent when you don’t do anything. Consequently, if someone knows your device’s MAC (like your phone’s), they can potentially keep track of you — both at local (LAN) and Internet (WAN) levels.
(For this reason, by default, some modern mobile devices automatically use a temporary random “virtual” MAC address when it connects to a new Wi-Fi network.)
And that’s also the reason, now and then, you might want to change your device’s MAC.
Reasons you might want to change your MAC
Take “change” with a loose meaning of the word. It’s more of a spoofing than changing since this is only at the software level. The real MAC will return when you restart or reset the device.
Still, here are a few occasions where you might want to change your device’s MAC.
- You want to re-use an already-approved MAC address on a new device — the reason many routers have a “MAC clone” feature. (By the way, in this case, on the reverse, if you change the MAC of an approved device, it will be disconnected.)
- You know your computer has been blocked or restricted from a network and want to sneak through. (Sorry, daddy! Your Parental Control settings will no longer be in effect!)
- You’re about to join a new network — like a public Wi-Fi — and don’t want folks to know your device’s real MAC.
And, finally, you don’t need any reason. You can change the MAC for the hell of it because you can. That’s, of course, if you know how to figure out that of your device.
How to figure out your device’s MAC
There are many ways to find out a device’s MAC address, depending on the device type. For example, on a router or a modem, the address is generally on the underside of the hardware itself. Just flip it up and take a close look.
But most of the time, we need to figure this out via software, like the device’s operating system. So, in a mobile device (like a phone), this tends to be in the “About Device” area.
You can find out about the MAC on computers the way you find out your current IP address. Since MAC and IP are closely related, the two are almost always stored next to each other. In other words, if you see the IP, chances are the MAC is around.
Pro tip: If your computer has two NICs (one for Wi-Fi and one for Ethernet), here’s how to know which MAC address belongs to which NIC: Connect one of the NICs to a network only that one will also have an IP address.
How to change a device’s MAC address
Now that you know what a MAC is and where to locate it, let’s find out how you can (temporarily) change it.
By the way, unlike a VIN, it’s not illegal to alter your device’s MAC address. That’s probably because you really cannot permanently change a device’s MAC address anyway.
What you can do is disguise a NIC’s actual MAC address as another using software. This change is temporary. When you reset (or reinstall) the application, move the NIC to a different device, or even restart the device, its original MAC address will return.
Again, that said, keep in mind the limited sense of the word “change” in this case. I’d say “MAC spoofing” is a more accurate choice of expression.
There are many different types of networking devices, of which some you can change the MAC address, some you can’t. Generally, though, you can change the MAC of a router or a computer. And that’s probably all we’d need to do anyway.
How to change the MAC address of a router
It’s only possible to change a router’s MAC address if the router has the MAC Clone feature — most routers do.
In this case, all you have to do is log into the router’s web interface, navigate to the WAN (Internet) setting area and choose to enter a new MAC address — whichever you want as long as it fits the format.
Or you can choose to clone the MAC of the computer you’re using. After that, apply the change, and the router will carry that MAC address until you reset it to default factory settings.
How to change the MAC address of a Windows computer
There are many ways to change the MAC on a Windows computer. The following is the easiest way. You need to use an account with the administrator’s privilege.
- Click on the Start button, type in ncpa.cpl then press Enter, the Network Connections window will appear.
- Right click on the network adapter you want to work with and chose Properties. The Properties window of the connection will appear.
- Click on Configure button, then on the Advanced tab.
- Navigate to the “Network Address” (or “Locally Administered Address”) entry.
- Change the Value to a MAC address of your liking. It needs to be entered without any dash or colon, like this: D4FB6A7C31B4 then hit OK. By the way, if the new address doesn’t work out, just enter another one. (There are actually complicated rules but it’s faster to just try random letters and numbers until it works).
And that’s it, restart your computer, and your new address will apply. To undo this, repeat steps from 1 to 4, then choose Not Present before clicking OK. Also, if you reinstall Windows from scratch, the real MAC will be restored, too.
How to change the MAC address of a Mac computer
Again, there are a few different ways to change MAC on an Apple computer, but the following is the most convenient. Note that you need to log in to a Mac with an Admin account for this to work.
- Determine the NIC you’re working with: This is called the interface name. If the computer has just one network adapter (all Wi-Fi-only computers are like that), then the interface name is always en0 (that’s en and zero). But if the machine has another NIC, its interface name will be en1 and so on. Determine which one’s MAC you want to change.
- Make sure the NIC is not being used: If this is an Ethernet NIC, disconnect the network cable. If it’s a Wi-Fi adapter, press and hold the Option key then click on the Wi-Fi icon (top right corner), then click on Disconnect from the current Wi-Fi network. Do not disable (turn off) the adapter!
- Call up Terminal: Use Spotlight (Command + Space bar) and then search for “Terminal” when found, click on it. The Terminal program will run.
4. Execute the MAC change command
Assuming you want to use our example MAC address above, the NIC’s interface name is en0. (If the device has more than one network adapter, you’ll also see en1, en2, and so on, with each representing a NIC.)
Now copy and paste the following command into Terminal, then press Enter (enter your account’s password, then press Enter again, if prompted):
Alternatively, you can use this command to create a random MAC address:
And that’s it. From this moment on, your NIC will have a new MAC address. When you restart the computer, though, the NIC’s original MAC will return. To make the change persistent, you can write a startup script with the command above.
By the way, if you want to test if the new MAC is in effect, use this command:
It will show the current MAC address the adapter is using.
And that’s all there is to know about the MAC address. You won’t need to worry about it most of the time, but sometimes knowing how to change your MAC makes you feel like you have the power. It feels good.
By the way, if you ever wonder what will happen if two devices are sharing the same MAC address in a network. The answer is entirely predictable.
Though extremely rare, this can occur, and I have deliberately made that happen just for kicks. In this case, both devices will get the same IP address, and you’ll have an IP conflict situation, and neither device will get connected. Not good.
Just pick another MAC address. There are plenty of them.
CM MAC Address?
> [...] my old C6300 cable modem [...]
C6300[v1] or C6300v2? Look for "Model" on the product label.
It's a modem+router, not a simple modem, but it may not matter much
in this context.
> [...] They need my modem's CM MAC address. [...]
Did you get a definition of "CM MAC address"? Knowing nothing, I'd
guess that that was supposed to mean "Cable Modem MAC address".
> The modem only had a MAC address. Is there a CM MAC address for my
> C6300 modem?
Other than asking what they meant, I'd suggest providing what you
have. Where, exactly, did you find your "a MAC address"?
If you get desperate enough for information, then you might try the
usual last resort of the uninformed:
Visit http://netgear.com/support , put in your (actual) model number,
and look for Documentation. Get the User Manual (at least). Read.
Look for "MAC address"?
Mac meaning cm
A Media Access Control address (MAC address) is a unique identifier assigned to network interfaces for communications on the physical network segment. MAC addresses are used for numerous network technologies and most IEEE 802 network technologies including Ethernet. Logically, MAC addresses are used in the Media Access Control protocol sub-layer of the OSI reference model.
MAC addresses are most often assigned by the manufacturer of a network interface card (NIC) and are stored in its hardware, the card's read-only memory, or some other firmware mechanism. If assigned by the manufacturer, a MAC address usually encodes the manufacturer's registered identification number and may be referred to as the burned-in address. It may also be known as an Ethernet hardware address (EHA), hardware address or physical address.
MAC addresses are formed according to the rules of one of three numbering name spaces managed by the Institute of Electrical and Electronics Engineers (IEEE): MAC-48, EUI-48, and EUI-64. The IEEE claims trademarks on the names EUI-48 and EUI-64, in which EUI is an acronym for Extended Unique Identifier.
HFC = Hybrid Fibre-Coax. This abbreviation refers to the port of the cable modem that connects to the CATV coax cable. Some cable ISPs require you to register with them the HFC MAC address of your cable modem.
The HFC MAC address of the cable modem is stamped on the manufacturer's label on the back or underside of the cable modem, or on the label of the box in which the cable modem was sold.
Cable modems might have multiple MAC addresses, one for the HFC side (cable TV coax socket), and one for the CPE side (Customer Premises Equipment, the ethernet socket). USB-capable cable modems also have two further MAC addresses: one for the cable modem USB socket, and another for the emulated network interface in the USB driver in the PC. Although it is possible to discover the CPE MAC address(es) of the cable modem, there is no application or procedure that requires them.
answered Jan 10 '11 at 20:26
CM Meaning in Mac - What does CM mean in Mac?
The meaning of is Contextaal Menu and other meanings are located at the bottom which take place within Mac terminology and CM has 2 different meaning. All meanings which belong to CM abbreviation are take part only within Mac terminology and other meanings are not found. If you want to see other meanings, please click the CM meaning link. Thus, you will be directed to page which indicates all meanings of CM.
Unless there are 2 different meanings CM abbreviation at the bottom, please search again by typing question structures such as “what does CM mean in Mac, the meaning of CM in Mac”. Besides, you can search by typing CM in the search box which is found our website.
CM Meaning in Mac
- Contextaal Menu
- Celtic Maggzine
Please also find CM meaning for Mac in other sources.
What does CM stand for Mac?
We compiled queries of the CM abbreviation in Mac in search engines. The most frequently asked CM acronym questions for Mac were selected and included on the site.
We thought you asked a similar CM question (for Mac) to the search engine to find the meaning of the CM full form in Mac, and we are sure that the following Mac CM query list will catch your attention.
What does CM meaning stand for Mac?CM meaning stands for Contextaal Menu.
What is the meaning of CM abbreviation in Mac?The meaning of CM abbreviation is `Contextaal Menu` in Mac.
What is CM definition ?CM definition is "Celtic Maggzine".
What does CM mean in Mac?CM mean that "Celtic Maggzine" for Mac.
What is CM acronym ?CM acronym is "Contextaal Menu".
What is shorthand of Celtic Maggzine ?The shorthand of "Celtic Maggzine" is CM.
What is the definition of CM acronym in Mac?Definitions of CM shorthand is "Celtic Maggzine".
What is the full form of CM abbreviation?Full form of CM abbreviation is "Celtic Maggzine".
What is the full meaning of CM in Mac?Full meaning of CM is "Celtic Maggzine".
What is the explanation for CM in Mac?Explanation for CM is "Celtic Maggzine".
What is the meaning of CM Abbreviation in Astrology ?
The site does not only include the meanings of the CM abbreviation in Mac. Yes, we know your main purpose is explanation of CM abbreviation in Mac. However, we thought that besides the meaning of the CM definitions in Mac, you can consider astrological information of CM acronym in Astrology. Therefore, the astrological explanation of each word in each CM abbreviation is also included.
CM Abbreviation in Astrology
- CM (letter C)
You are a very social individual, and it is important to you to have a relationship. You require closeness and togetherness. You must be able to talk to your sex partner before, during, and after. You want the object of your affection to be socially acceptable and good looking. You see your lover as a friend and companion. You are very sexual and sensual, needing someone to appreciate and almost worship you. When this cannot be achieved, you have the ability to go for long periods without sexual activity. You are an expert at controlling your desires and doing without.
- CM (letter M)
You are emotional and intense. When involved in a relationship, you throw your entire being into it. Nothing stops you; there are no holds barred. You are all consuming and crave someone who is equally passionate and intense. You are willing to try anything and everything. Your supply of sexual energy is inexhaustible. You are very social and sensual; you enjoy flirting and also enjoy mothering your mate.
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At the last moment I remembered what needed to be pulled out, and only my pussy left the pussy as a thin trickle flew from. Him like a cannon, she drew an arc in the sky, and landed on the woman's chest. I wanted to turn around somehow, but my legs did not obey me, and the sperm accumulated from a long abstinence flew onto.
The woman's white blouse, fell on her stomach, and hit her skirt. The librarian could hardly restrain herself from yelling at me, hissed through her teeth: -What are you doing, you shit.