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. Typical (IPv4) address consists of four octets. IP addresses serve for general host identification purposes in IP networks ( RFC 791).
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