A MAC address is a unique identifier for network adapters or network interface cards.

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arp command returning weird info for Apple routers

When I use arp -a command, my two Apple routers (Extreme and Express) return weird results, unlike my other results. The IP address isn't a LAN IP address like the other results and the MAC address ...
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1k views

Planetlab and scapy: MAC address to reach destination not found

Using the minimal Fedora 14 distribution provided in PlanetLab, I'm forging packets through Scapy and sending them with tcpreplay. I thought I had installed all the necessary packages to run scapy ...
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342 views

Spoofing MAC address to match other device [duplicate]

Possible Duplicate: What happens when two PCs have the same MAC adress? At my school, there is a WiFi network where you can register up to one computer or phone. I, however, wish to connect ...
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779 views

Why does my MAC address reset after reconnecting?

I use Ubuntu 12. I'm changing my MAC address with ifconfig wlan0 hw ether xx:xx:xx:xx:xx:xx, which works. However when I restart my connection, my computer resets the MAC address to my original MAC ...
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395 views

Blocking or Disabling Rogue Routers

We have a medium sized network and from time to time something bad happens. Once it was a router configured to assign IPs via DHCP that did not match our network mask, thus making all clients unable ...
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807 views

Firewall rule in Windows 7 that allows MAC Address Proxy Authentication

I'm using Windows 7 Ultimate and I', using Windows Firewall with Advanced Security. My proxy server uses MAC Address as it's authentication scheme. When the firewall is in disabled state, I can ...
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6k views

Is is possible to change MAC address of a WiMAX USB adapter?

Wondering if it is possible to change the MAC address of a WiMAX USB adapter (read WiMAX, not Wi-Fi) manufactured by Motorola, ZTE, Intel etc. I've tried a few tools that did changed the MAC address ...
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Can a Virtual PC emulate a mac address for the network card too?

Can a Virtual PC emulate a mac address for the network card too? It probably is possible but I think the Virtual PC / VirtualBox / VMWare / Parallel, all probably won't support it as the mac address ...
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Windows - MAC address whitelist on wired network?

In Windows (XP or 7), is it possible to configure either Windows, a software firewall, or network cards such that the computer will only communicate with specific known MAC addresses (e.g. the MAC ...
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57 views

Two wireless extenders with same mac address…How to assign IP address dhcp

I have two wireless extenders, and they both have the exact same mac address (same make and model) Now, they work fine in the network, I just wanted to know how can I assign them specific IP ...
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193 views

Spoofing Windows 7/8 Mac address with 00: manufacturer?

As I am sure everyone knows starting with Windows Vista, you are not able to spoof MAC address to something that starts with a 00: For a project I am doing I have to spoof it as starting with 00: I ...
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Can I track the MAC address of my stolen laptop by service tag number?

My Dell Vostro laptop was stolen five days back. Many valuable documents were on it, so how can I trace the MAC address of my stolen laptop? Can the MAC address be traced through the service tag ...
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155 views

Why would results differ from trying two different methods to get a MAC address?

While trying to find MAC addresses of networked machines, two different methods were used and different answers were received: Ping the machine name using the command nbtstat -a xxx.xxx.xxx.xxx (x ...
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3k views

No IP address given to router until after cloning MAC address from another computer

This problem had me occupied most of the day until I finally solved it just a little while ago. Unfortunately I still don't understand why the problem surfaced in the first place or why my final ...
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669 views

Internet Connection Sharing bypassing MAC Filter in Ubuntu Linux

My university gives me an internet connection by Ethernet, DHCP but they have installed MAC Filtering to allow only using my PC. I have a wireless router TL-WR340GD. which has MAC address cloning ...
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987 views

MAC address based VLAN: How to get the MAC address of a newly attached device?

I am in a network that determines by the MAC address of attached devices to which VLAN the used switch port has to be set to. For regular devices that use DHCP the MAC address can be simply ...
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230 views

Using a laptop with multiple static-ip routers

I use my Windows XP laptop with Wi-Fi at school, home, work and by my parents. Each of these has a different setup (one DHCP and the other three use different static IPs). Is there a way to attach a ...
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3k views

Spoof MAC address in Windows 7: Bypass

I am trying to spoof the MAC address of my new Win7 laptop. To do so I tried specifying an alternate value from the Device Manager which took no effect. I also tried from the registry, as per other ...
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671 views

How to blacklist a problem Wi-Fi access point by MAC address in Mac OS X

So I am a small Mac-user cog in a larger Windows-based network machine. The network here works fine for most everyone else (on PCs), but I have random timeouts and issues with the Wi-Fi. Luckily, I ...
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9k views

What does modem MAC address mean?

I have a Motorola modem, and when I connect to 192.168.100.1 (modem IP) I see 5 MAC addresses: HFC MAC Address, CPE USB MAC Address, Known CPE MAC Addresses (4), of which one has status SELF and ...
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4k views

How can I telnet from Windows to my server by MAC address?

How can I telnet from Windows to my server by MAC address? C:\Users\Asep>telnet D4:CA:6D:46:C9:98 23 Connecting To D4:CA:6D:46:C9:98...Could not open connection to the host, on port 23: Connect ...
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897 views

What is this device?

I have a DSL modem with WiFi, and on the list of devices connecting to it, there is one device that is foreign to me (10.163.55.254 in the screenshot below). How can I track down what it is and where ...
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How do I find the MAC address of my laptop?

I tried to find out the MAC address in my notebook by Run → cmd → config /all but I didn't find it there. How do I find the MAC address of my laptop?
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Duplicate MAC but different IP on home router

Would it be possible to have duplicate MAC addresses but different IPs on a home router? My questions are listed below. I don't have computers with the same MAC. The second connection displays no ...
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3k views

How to find who is connected to my computer from MAC address?

When I type in the command netstat -an into cmd, I get information that one of my ports is opened from some MAC address. My qestion is how to close that port and how to find from the MAC address what ...
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How does a router find the MAC address of next hop router?

I know that in an Ethernet LAN, the ARP protocol is used to get a MAC address from an IP address. How does my router get the MAC address of another router on an external network if ARP is not ...
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What will happen if a bridge got a wrong mac record?

Let's say there is host H1, H2, switch S1 S2, and S3, bridge B1, B2. It is connected like this: H1 - S1 - B1 - S2 - B2 - S3, | H2 H2 is sending frames to H1. Then, ...
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171 views

If I format a machine that's running Ubuntu and install Windows, will the physical network address change?

My ISP binds the access to the physical address of my computer. I bought a new one yesterday and I had to call them to tell them the new physical address. Will it change if I format the computer and ...
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243 views

DHCP Reservation vs Mac address filtering. Are they the same security?

I am able to give an ip address to a wired/wireless device based on the mac address. Other automatic DHCP is turned off. Is this as effective as a security measure as MAC filtering? It just seems ...
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691 views

Cannot change MAC address on notebook

I've tried to change MAC address on a notebook Toshiba Satellite A200-14E Windows Vista without success. I've tried to change it via Network settings - Adapter settings. I've set Network address ...
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1k views

How can I block a computer from my linksys router by IP or MAC address?

How can I block a computer (not on Wireless) from my linksys router by IP or MAC Address? I am using a linksys WAG200G.
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How do I find out the Mac Address Firefox submits for Geolocation?

I moved, but have the same router and cable box. Now when I visit Google Maps it still shows my old location. I went to the SkyhookWireless update page to update my Mac Address with my new location. ...
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How do you get the Mac-address of a Networking Card in Windows?

I'm running XP SP2 and need to get the MAC address of the card running on this machine. Where do I get that from?
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Mac spoofing for virtual machine to trick my university's IT system

I need help in setting up Oracle's VirtualBox port forwarding and/or mac spoofing. I feel it's important to add that my knowledge is very limited in this field and that my question could even be ...
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47 views

Bridge-mode networking and virtual network adapters

Say I have physical network adapter eth0 on my host machine and VirtualBox virtual machine with bridged network. Host and virtual machine have different IP addresses in the same network. I can easily ...
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56 views

Why is the IP and host specified in the /etc/hosts not pinged as expected?

I have an entry in my /etc/hosts file which points to each host on my LAN. I've completed specified all my hosts and corresponding host mac addresses in my Time Warner supplied router. I've created ...
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How many bytes of a WLAN packet do I have to examine to extract MAC addresses?

How many bytes of a 802.11 (WLAN) packet do I have to examine to be able to extract source, destination, receiver and transmitter adress from the header? This image suggests the header length of a ...
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10k views

How to get an IP address from a MAC address? [duplicate]

I have an ipscanner, but not every device is showing up. If I know a device is on the LAN, and I know its MAC address, how can I get it's IP address?
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200 views

NAT on MAC-filtered network

My ISP (Hyperion S.A.) provides internet using a UTP cable with MAC filtering. I'm trying to set up a router so that I can connect multiple computers to the network. Most computers would connect ...
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539 views

why do I get a different MAC address using arp and ifconfig?

# ifconfig eth1 Link encap:Ethernet HWaddr 00:1e:8c:10:xx:xx # arp Address HWtype HWaddress Flags Mask Iface 192.xxx.x.x ether ...
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221 views

Can the MAC address(es) of a Windows XP machine be found in a backup of C:\Documents and Settings\

I recently had a Windows XP laptop stolen I do not know its MAC addresses (wired or wireless) I have managed to retrieve its wireless MAC from the WiFi router it was attached to, but I have no ...
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2k views

Can I change the MAC Address on my Airport Extreme WiFi Router?

I am trying to do some diagnostics on my Time Warner Wideband Internet connection. To do so I would like to spoof the MAC Address on my AirPort Extreme WiFi Router. I cannot find a way to alter the ...
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4k views

Theory regarding MAC and IP address in network packet and frame content?

Okay, network theory and protocol questions for you guys: Assuming a router is using NAT, is a device's MAC address every actually exposed to the Internet? Or, does the router transmogrify (wow, ...
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267 views

Using MAC address prefix AB:CD:EF

I'm trying to use tcprewrite to change the source MAC address of some packets. I deliberately chose the prefix AB:CD:EF that does not belong to any hardware manufacturer so that I can distinguish such ...
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788 views

Restrict users with regard to their MAC addresses. Is it possible with Squid?

I need to restrict the users with regard to their MAC addresses. Is it possible with Squid?
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244 views

Why does my DSL modem list more than one physical address?

OS : Windows XP 32 Modem: Huawei MT882 What little I know, physical address is typically unique for a given network adapter. Why then does ipconfig /all give me more than one physical address listed? ...
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tools to hide ip and mac address

Are there any fast and free software to: Hide my IP address without proxy server as it changes the layout of the web site and makes it not fast at all. Dynamic MAC address generator to change it ...
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829 views

Connect to the internet by changing the mac address

My ISP allows only one computer so I have to change the mac address. On the other computer I use ubuntu and I've changed my mac address with both ifconfig and macchanger. The internet still doesn't ...
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1k views

How reliable is changing the mac address in /etc/network/interfaces?

I'm running ubuntu server 10.04 If i change the mac address by adding (in /etc/network/interfaces) hwaddress ether 12:34:56:78:9A:BC How reliable is this? Can someone still determine my real mac ...
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2k views

How do I find out the MAC address of my Wi-Fi card in Windows 7? [duplicate]

Possible Duplicate: How to locate MAC address in Windows 7 How do I find out the MAC address of my Wi-Fi card in Windows 7? Is there some screen in the GUI I can look at? Or something in a ...