9/6/2023 0 Comments Mac address wireshark![]() ![]() It uses the Wireshark manufacturer database, which is a list of OUIs and MAC addresses compiled from a number of sources. Hopefully this gives you a bit of insight about the "redundancy" you were questioning. The Wireshark OUI lookup tool provides an easy way to look up OUIs and other MAC address prefixes. ![]() ![]() I could get into clustering, failovers - the list goes on, although I would end up writing a book trying to explain it all. While browsing the captured packets, I saw a source of Apple (my laptop) and a destination of all HSRP routers. Depending on the exact situation, it might be telling us it's a link up/down event, maybe it's trying update other devices ARP tables, or possibly detecting an ip conflict and moving the ip to another NIC. Being a newbie to Wireshark I tried it out in my universities library. For example, you might see a host send an ARP request with its own address as the target address. On large scale networks it's quite common to observe changes in the MAC/ARP/Source/Dest information, and at times can seem almost incorrect. Try to resolve an Ethernet MAC address (e.g., 00:09:5b:01:02:03) to a human readable name. They serve different purposes on different network layers. In RFC 3927 there's what is known as Gratuitous Address Resolution Protocol (GARP), and in certain circumstances the redundancy, or lack of, plays an important role, especially in troubleshooting and monitoring networking stacks.Īctually it's not rendunancy at all, the MAC (physical, layer 2) and IP (logical, layer 3) addresses are not the same thing. The "redundancy" was by design (RFC 826), and can be useful in targeting different layers. ![]()
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