convert MAC address to IP Solved

Question

Hello everyone, I wanted to know if anyone knows how to convert a MAC address to an IP address??? Thank you in advance

brupala · Accepted Answer

Well yes,
it's called ARP (Address Resolution Protocol):
see the message above: the command arp -a
the ARP table is the mapping table between MAC addresses and IP addresses.
It is constantly refreshed.
It is essential in IPv4.
Useless in IPv6 (replaced by something else: neighbor discovery)
http://www.commentcamarche.net/internet/arp.php3
--
and ... There you go!

KdTcA · Answer

Impossible!!!  A MAC address is a unique address created by the manufacturer...nothing to do with an IP address...

htahar · Answer

I think you are asking to convert it to decimal?? In IP address impossible, in decimal it is quite simple.

A6world · Answer

Well, if the reason for your search is on an IP network, you just need to go to the command prompt and run the following command: arp -a. It will show you the contents of your ARP cache, i.e., the MAC addresses resolved into IP addresses known by your computer.
--
Programs are like sex. Better when it's free.

SpykoZ · Answer

It's true that the MAC address cannot be translated into an IP address, even though it allows for finding the IP. A MAC address being unique is assigned to Ethernet cards at the factory, etched in the ROM...
However, there are programs that allow you to find the IP that corresponds to a MAC address...
Techniques working on packet sending also allow for resolving MAC addresses. At least, I think so....

FrancoisR · Answer

Hello,

Why not use the MAC address directly for addressing computers on the Internet? Why was it absolutely necessary to invent IP, to then match it to a MAC address? For me, that feels like searching for midday at 2 PM... for now... Once I have the explanation, I will change my perspective :) Is it more secure to have an address that changes constantly?

See you soon.

PS: If someone could reply to my message here, that would be super cool! :
https://forums.commentcamarche.net/forum/affich-2176059-cablage-rj45-mural-autorisations

PeJo · Answer

Hi,  Why not use the MAC address directly for addressing computers on the Internet? A MAC address is (supposed to be) fixed, whereas on the net IP addresses are dynamic.   Why was it absolutely necessary to invent IP, only to later correspond it to a MAC address? I believe it’s because during the Cold War, Americans were afraid that in the event of a bombing, they would lose part of the network and lose communications. With IP, since the Internet network is meshed, if one part falls, the message can take another route.

FrancoisR · Answer

Thank you for your reply  A MAC address is (supposed to be) fixed, while IPs on the internet are dynamic. Of course, but my question is precisely: why is there a need for dynamic addresses?  With IP, since the internet network is meshed, if one part fails, the message takes another route  wouldn't that be the case if we directly used MAC addresses?  See you soon!  François

PeJo · Answer

Of course, but that's exactly my question: why is there an absolute need for dynamic addresses?   Imagine if they weren't dynamic at the routing table of each router, and a little guy had to think, "Today Mr. Martin is joining our ISP, I need to enter the route for his MAC address on the routers," well, good luck with that. Whereas with dynamic IPs (and especially the IP ranges given to ISPs), there's no need to perform this work; it's done "automatically."  With IP, since the internet network is mesh, if one part goes down, the message takes another route. That wouldn't be the case if we used MAC addresses directly, would it?  The MAC address is fixed. How can we specify that some machines should communicate with each other and others not??? We can't just make only machines with identical network cards communicate, so imagine on the internet.  The IP protocol was developed to allow communication between all types of machines supporting this protocol. With the MAC address, this communication seems difficult (what identifier could we base it on???? How to create sub-networks???? Etc......). I hope you understand now.

PeJo · Answer

I'm glad you understand better now. Have a great end of the day.

brupala · Answer

Hello,
I'll add two more things to your little discussion:
IP addresses are universal and independent of the link protocol (layer 2): Many machines do not have a connection to an ethernet network (or token ring or fddi) so they have no MAC address, which does not prevent them from having one or more IP addresses; this is the case for links such as:
ATM, PPP, FRAME RELAY, POS, X25... practically all WAN links, in fact.
On IPv6, part of the IP address (the last 7 octets) is a copy of the MAC address, so the MAC address is indeed used to create the IP address.
This was also the case for other network protocols than TCP/IP: IPX.
In IPX, the address consists of a 4-octet network number and the MAC address of the machine.
IPX addressing could have been used to build global networks as well.
DECnet (let's forget it if we haven't already) also bases node addresses on the MAC address.
--
And... there you go!

A6world · Answer

The MAC address cannot go on the internet for a simple reason: if we look at an IP packet, it is encapsulated in a frame (layer 2) that is necessary for LAN travel... because when a PC boots up, it looks for its DHCP server, and it searches for it using frames... layer 2 is blocked by routers because the first person who would boot their PC would flood the entire internet.... as for the MAC address, some thought it could be used for security, but they quickly realized that it couldn't serve as security.... to pass through a router, we need a layer 3 address, so the IP... let's only talk about IPv4 to be sure that the concept is understood. IP was developed by the American DOD for what we call routing, no matter what happens or what media is used to transmit the data... so dynamic IP allows for certainty of having an IP; dynamism was developed to meet a demand to communicate without blocking all other PCs, which a MAC would do on a broadcast  anyway, Brupala is absolutely right... and I think he did well to give fewer details because it is quite complicated, especially for people who are not knowledgeable -- programs are like sex. Better when it's free

PeJo · Answer

With some issues in expression, it's not really understandable anyway!!!
One last clarification: because this is really complicated especially for people who don't know about it??
No pretensions please, thank you.

bilaal · Answer

Hello; I've read that under Windows XP or Linux you can change the MAC address for example under XP you go to Device Manager, properties of the network card, Advanced, Network Address and enter the desired MAC address value. My question is what is the purpose of changing your MAC address? And thank you in advance.

profbod4 · Answer

MAC address and IP: They have nothing to do with each other. Simply put.

w1sm3rhi11 · Answer

And what do you do with the ARP cache, profbod4?  https://fr.wikipedia.org/wiki/Address_Resolution_Protocol

pascalmbayiha · Answer

On told me about a tool called nmap, do some research on it.

HakMan · Answer

Hello,  Microsoft Network Monitor http://www.microsoft.com/downloads/details.aspx?familyid=18b1d59d-f4d8-4213-8d172f6dde7d7aac

kaizer · Answer

Hello,

I would like to know, for those who are working, what is the role of certifications (such as CISCO certification) in the job market? (I can't really know since I'm still a student.)

Thank you.

PetitPoney · Answer

Hello;
I read that on Windows XP or Linux, you can change the MAC address
for example, under XP you go to the device manager, properties of the network card, advanced, network address and enter the desired MAC @ value.
My question is, what is the purpose of modifying your MAC address? Thanks in advance.

The advantage is to make yourself "anonymous" on a network.
It can be useful, for example, in the case where you might want to conduct a MAC attack. However, you should know that only 10% of network cards allow you to physically change the MAC address.

Some software allows you to mask the MAC address and replace it "virtually." When you connect, you will therefore have someone else's MAC address and will pass yourself off as them. (If a network is secured considering the MAC addresses allowed to connect and you spoof an authorized address, you will be able to access the network.)
But you should know that this address replacement is reversible, and it is easy to find your actual MAC address and thus identify you.

The advantage of physically changing the address is that your trail is no longer traceable.

There you go, it's a rough summary, but I hope it sheds some light for you.

PetitPoney · Answer

Hello everyone,
I wanted to know if anyone knew how to convert a MAC address into an IP address???
Thanks in advance

A MAC address is physical and an IP address is logical.
Therefore, it is not possible to convert a MAC address into an IP address.

ARP makes a parallel between a MAC address and an IP, but does not convert it in any way.

mechi · Answer

Why do we use IP addresses for routing packets even though we can identify each interface using its MAC address?

Convert MAC address to IP

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