A network link-local address is an address that is valid only for use within the network segment or the broadcast domain that a host is connected to. Link local addresses can be layer 2 or layer 3. For example, a 48-bit Ethernet MAC address is one form of a layer 2 link-local address. Link-local addresses are generally not guaranteed to be unique beyond a network segment. Because of this, layer 3 switches (routers) do not forward packets with layer 3 link-local addresses. For Layer 3 IPv4 link-local (IPv4LL) addresses, RFC3927 specifies the address block 169.254.0.0/16. Zero-configuration Networking (zeroconf) is a
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Avahi is a technology which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In theory, this enables you to plug your computer into a network and instantly be able to view other people who you can chat with, find printers to print to or find files being shared. Avahi also allows your computer to advertise running network services. Avahi implements the Zeroconf specification, mDNS, DNS-SD and RFC 3927/IPv4LL. It also uses D-Bus. Compatible technology is found in Bonjour/mDNSResponder. By the way, Avahi is the Malagasy name and scientific Latin name of a genus of woolly lemur, |
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