CONVERTING MAC ADDRESS INTO HEXADECIMAL SOFTWARE

Layer 2 (Data Link Layer ) uses a MAC (Media Access Control) address. Layer 3 uses IP addresses and is responsible for packet delivery from end to end.Layer 2 uses MAC addresses and is responsible for packet delivery from hop to hop.It’s divided into seven layers, each performing specific functions. This model is a conceptual framework that describes how data is sent and received over a network. The reason for having both IP and MAC addresses lies in the way the Internet works, specifically in the structure of the OSI Model. Reason to Have Both IP and MAC Addresses. Frames that are destined with MAC address FF-FF-FF-FF-FF-FF will reach every computer belonging to that LAN segment. Ethernet frames with ones in all bits of the destination address (FF-FF-FF-FF-FF-FF) are referred to as the broadcast addresses. Broadcast: Similar to Network Layer, Broadcast is also possible on the underlying layer( Data Link Layer). IEEE has allocated the address block 01-80-C2-xx-xx-xx (01-80-C2-00-00-00 to 01-80-C2-FF-FF-FF) for group addresses for use by standard protocols.ģ. In Layer-2 (Ethernet) Multicast address, the LSB (least significant bit) of the first octet of an address is set to one. Multicast: The multicast address allows the source to send a frame to a group of devices. The MAC Address of the source machine is always Unicast.Ģ. If the LSB (least significant bit) of the first octet of an address is set to zero, the frame is meant to reach only one receiving NIC. Unicast: A Unicast-addressed frame is only sent out to the interface leading to a specific NIC.

CONVERTING MAC ADDRESS INTO HEXADECIMAL SOFTWARE

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I can use dhall to convert them to hex and I can use hdall to convert them back. The bc utility won't take the alpha characters if they are in lower case. You may need the bc versions for those.Īlso notice that I move all of the hex characters to uppercase for conversion. You'll find that the printf versions are much faster, however, not all unix shells or unix flavors offer bash and printf. I've included some older variants where I used bc as my converter. This is handy at the shell in case I'm using the MySQL command line utility. Hdall converts hex numbers to base 10 and dhall converts a base 10 integer to hex. If there are more MAC addresses I can use a simple set of shell functions defined in a shell library file and sourced in my. I when I formulate my queries I can use MySQL's 0x100000000001 syntax if it's just one MAC address. When I do my lookups I use SqlYOG running in wine. I'll get hex MAC addresses from routers and then need to look them up in a database where the are stored in MySQL as big integers. In my work I frequently deal with MAC addresses.

Converting mac address into hexadecimal