#Reason for mac addresses mac
For this reason the FireBrick uses distinct MAC addresses on each interface. This can lead to broken networks or traffic leaks between VLANs, neither of which is good. However, once again, practical experience shows that some network devices and some network switches do not handle the concept of the same MAC address appearing on different ports or VLANs within the network. The fact that they are globally unique is simply to avoid any clashes on a LAN segment. In theory the scope of a MAC address is a single LAN segment.If you have more than one DHCP client subnets in your configuration they will automatically get separate MAC addresses. Whilst DHCP theoretically does not need separate MAC addresses, experience suggests this is by far the most practical approach. This is useful on some cable modem type installations where multiple IPs are only available if the FireBrick appears to be multiple devices at once. The FireBrick can operate as a DHCP client device multiple times on the same LAN segment, obtaining several separate IP addresses.The MAC addresses currently in use on the Ethernet interfaces. Such as when trying to identify what IP address a DHCP server has allocated to a specific FB2700. However, there are occasions where this information is useful,
Most of the time, FB2700 users do not need to know what MAC addresses the product uses. A unique block of addresses is assigned to each FireBrick, with the size of the block dependent on the model. However, practical experience has led to the use of multiple MAC addresses In principle the FireBrick could have a single MAC address for all operations. MAC addresses are commonly written as six groups of two hexadecimal digits, separated by colons or hyphens.įB2700s currently ship with an OUI value of 00:03:97. OUIs are issued by the IEEE - more information, and a searchable database of existing OUIs are available at These are globally unique and allocated by the equipment manufacturer from a pool ofĪddresses that is defined by the first three octets (bytes), which identify the organization, and are known as the Organizationally Unique Some router will use the ip address to attribute a same ip address to the same device at each connection.
Using with a DHCP serverĮthernet networks use 48 bit MAC addresses. The Mac address allow everyone on the network to identify informations like the brand of your network card, and to follow youre connections on the network through the time. How the FireBrick allocates MAC addresses C.2.1.
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