![]() Usually, a unicast address is associated with a single device or host, but it is not a one-to-one correspondence. unicast - normally refers to a single sender or a single receiver, and can be used for both sending and receiving.host address - any other address that is not a network address and broadcast address can be used as a host address.The broadcast address uses the highest address in the network range. broadcast address - a special address for each network that allows communication to all the hosts in that network.For example, we could refer to the network 192.168.1.0 or 172.16.0.0 as a “Network Address.” network address - a standard way to refer to an IPv4 address assigned to a network. ![]() The IPv4 network consists of three addresses: Each octet is converted to a decimal format and separated by a dot. IPv4 uses 4-byte addresses which are segmented in four 8-bit fields called octets. You can use /ip address print detail to see which interface the address belongs to. Configuring an IP address to a physical interface included in a bridge would mean actually setting it on the bridge interface itself. In the case of bridging or PPPoE connection, the physical interface may not have any address assigned, yet be perfectly usable. It is possible to add multiple IP addresses to an interface or to leave the interface without any addresses assigned to it. The network prefix and the broadcast address are calculated automatically. In most cases, it is enough to specify the address, the netmask, and the interface arguments. It's also possible to specify an IP address followed by a slash "/" and the number of bits that form the network address. The network address value is calculated by binary AND operation from a network mask and IP address values. For proper addressing the router also needs the network mask value, id est which bits of the complete IP address refer to the address of the host, and which - to the address of the network. A typical (IPv4) address consists of four octets. So, the interface ID will be 02BB:CCFF:FEDD:1122.IP addresses serve for general host identification purposes in IP networks ( RFC 791). Next, the router will insert FFFE in the middle of the address listed above: This will result in the following hexadecimal address: Well, the router will first flip the seventh bit from 0 to 1. Invert the seventh bit of the interface ID.įor example, if the MAC address of a nework card is 00:BB:CC:DD:11:22, the interface ID would be 02BBCCFFFEDD1122. Insert FFFE in between the two, making the interface ID.ģ. Split the MAC address in two halves (6 hex digits each).Ģ. Here are the rules that a router uses to create the interface ID:ġ. The interface ID created this way is known as the modified extended unique identifier 64 (EUI-64). Also, the 7th bit in the first byte is flipped to a binary 1. An interface ID is created by inserting the hex number FFFE in the middle of the MAC address of the network card. The second part of an IPv6 unicast address (used to identify a host’s network interface) is usually a 64-bit interface identifier.
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