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It may be interesting for you to know that all the OUIs are registered and assigned to the manufacturers by IEEE. For example, let's say a network card manufactured by dell has a physical address: 00-14-22-04-25-37, in this address, 00-14-22 is the OUI of Dell which identifies that the device is by Dell. OUI is always the same for NICs manufactured by the same company. The first three sets of two hexadecimal numbers in a MAC Address identifies the card manufacturer, and this number is called OUI (organizationally unique identifier). There are several NIC manufacturers some well-known of them are Dell, Cisco, Belkin. The physical address is stored into the NIC by its manufacturer, that is why this address is also called a burned-in address (BIA) or ethernet hardware address. The network adapters or network interface cards always come with a MAC address which is fed into hardware, usually in read-only memory (ROM), or BIOS system. MAC Address usually consists of six groups of two hexadecimal digits. It identifies the hardware manufacturer and is used for network communication between devices in a network segment. It is also known as a physical or hardware address. MAC Address or media access control address is a unique ID assigned to network interface cards (NICs). All this information is useful if you want to verify the generated mac address with the original vendor of this device in OUI vendor database. Finding the mac address from this database tells us which manufacturer originally manufactured this device and what is the prefix, postfix of a given mac address, moreover it tells us what country was this device manufactured. The MAC Address vendor database consists of a list of mac addresses of all devices manufactured till date.
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#Convert mac address to bits manual
So both the script and the above manual technique work identically when converting Ethernet addresses to Token Ring or Token Ring addresses to Ethernet.MAC Address Lookup Tool searches your MAC Address or OUI in mac address vendor database. This is clearly identical to the inverse translation where the bit order is converted from 81 to 18.
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If the 8 bits in a byte are numbered from 18, this algorithm simply flips the order so that they appear from 81. The script provides an automated way to do these translations. So converting the entire address similarly gives 00-00-30-0f-21-06. The c becomes 3 and the 0 stays the same, giving a final value of 30. Then convert each of these characters by using Table 15-1. To figure out how this byte will look on the Token Ring side of the bridge, you first switch the two hex characters to get c0. Suppose the Ethernet address is 0000.0cf0.8460. This table converts each individual hex character in a MAC address, but there is more to it than this because a byte is eight bits long, not four bits like a hex character. Converting Token Ring to Ethernet MAC addresses Token Ring Table 15-3 shows how the conversion algorithm works. The rule for converting from one to the other is relatively simple, however, because it just reflects this reversing of the bit ordering. So when a bridge connects these two media, the MAC addresses of devices on the Ethernet side will look unfamiliar when viewed from the Token Ring side, and vice versa. Ethernet, on the other hand, puts the least significant bit first. Token Ring uses a convention of most significant bit first when writing a byte. Print "from Ethernet to Token Ring or Token Ring to Ethernet. Print "Note that this conversion is exactly the same whether converting Print "The output is the converted MAC address. Print " where is in the form HH:HH:HH:HH:HH:HH $_ = first check that there aren't any illegal characters in this address # first split the incoming MAC into bytesįor ($i=0 $i*2 < length($_) $i++) = substr($_, $i*2, 2) # addresses when bridging with RSRB or DLSw #!/usr/local/bin/perl # - a script to convert Ethernet to Token Ring MAC It also performs the reverse translation of Token Ring addresses to Ethernet, which is identical. The Perl script in Example 15-1 converts Ethernet addresses to the way they will appear when connected through a bridge to a Token Ring. You want to convert the bit ordering of MAC addresses to see how they will look after passing through an Ethernet-to-Token Ring bridge.