![]() How to recognise Digital Equipment Corporation's MAC address application?Ī device’s MAC address (Media Access Control address) is a unique sequence of numbers assigned to a network interface controller.How to recognise an ITU-T's MAC address application?.How to recognise a Cisco's MAC address application?.How to recognise an IANA MAC address application?.How to recognise an ISO 9542 ES-IS protocol's MAC address application?.How to recognise an IEEE 802.1X MAC address application?.How to recognise a TRILL protocols by MAC address?.How to recognise an AppleTalk protocols by MAC address?.How to recognise Token Ring specific functions by MAC address?.How to recognise a Bidirectional Forwarding Detection (BFD) on Link Aggregation Group (LAG) interfaces by MAC address?.How to recognise a MPLS multicast frame by MAC address?.How to recognise an IP frame by MAC address?.How to recognise a Virtual Router ID by MAC address?.How to recognise a Broadcast MAC address application?.How to recognise a vendor by multicast MAC address?.How to recognise MAC address application?.How to find my MAC address on Mac OS X?.How to recognise an Oracle Virtual machine by its MAC address?.How to recognise a Microsoft Hyper-V's virtual machine by its MAC address?.How to recognise a Docker container by its MAC address?.How to recognise a Parallels' virtual machine by its MAC address?.How to recognise a VMware's virtual machine by its MAC address?.How to detect a Virtual Machine by its MAC address?. ![]() MAC address randomization in WiFi probe requests.How could I get MAC address of my website visitor?.Is MAC address assigned permanently, or it could be changed?.What's the difference between EUI-48 and MAC-48?.What is the structure of a MAC address?.What is an Individual Address Block (IAB)?.What types of assignments are you tracking?.What is a 36-bit Organizationally Unique Identifier (OUI-36)?. ![]() What is an Organizationally Unique Identifier (OUI)?.What are a universal address and a local administered address?.If you haven’t followed me on Twitter please use this link to follow me.Pricing Documentation → Table of contents Please leave comments and continue this discussion on Twitter and Slack. ![]() I hope you found this interesting and thought-provoking. Vocera MC MAC address is always 01:00:5e:66:xx:xx xx:xx matches up with the 3 rd and 4 th Octet in the IP address. Stopping and starting the server or a fail-over will reset the address’s space as well. The range we use has 230.230.0.1 – 230.230.15.254 when the server runs out of addresses it will start over. The Vocera Multicast group MAC address is normally The first session will have 230.230.0.1 and each session will increase by one. I work for Vocera so naturally, the packets I have captured are Vocera Multicast sessions. Packet capture of a multicast MAC address Both MAC addresses would be 01:00:5e:66:00:01 I have never seen this cause an issue before but theoretically, it could. When we look at this a bit deeper you will see that since the 25 th bit is always 0 this MAC address for 230.230.0.1 and 230.102.0.1 would be the same. There is an issue when you convert multicast IP into a MAC address. The table below shows the MAC address for the multicast IP session of 230.230.0.1 This might be confusing at first but once you read it over a few times it makes perfect sense.Īll Multicast MAC addresses start 01:00:52:0 (the 25 th bit in the MAC address for a Multicast session is always 0) the next 23 bits are the IP address translated to binary or Hex. This blog will explain how the MAC address is created I will show you some screenshots displaying these multicast MAC addresses. The session would need this to move the traffic on a layer 2 network. I have always thought and talked about the multicast session in the form of an IP address like 230.230.0.1 but each MC session has a MAC address associated with it. How else would multicast traffic and packets get delivered? I guess I never took the time to even think about it before. This makes sense, but I was a bit surprised to find out the multicast sessions have their own MAC address. All packets on an IP network need to have a MAC address so the network can send the frames between layer 2 devices. Hopefully, this will help someone have a better understanding of multicast and how packets flow over the network. This may or may not be particularly useful, but I found it interesting, so I decided to blog about it.
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