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In computer networking, source routing, also called path addressing, allows a sender of a data packet to partially or completely specify the route the packet takes through the network. [1] In contrast, in conventional routing , routers in the network determine the path incrementally based on the packet's destination.
Source address: 32 bits This field contains the IPv4 address of the sender of the packet. It may be changed in transit by network address translation (NAT). Destination address: 32 bits This field contains the IPv4 address of the intended receiver of the packet. It may also be affected by NAT.
IPv6 introduces the concepts of address scope and selection preference, yielding multiple choices for source and destination addresses in communication with another host. The preference selection algorithm selects the most appropriate address to use in communications with a particular destination, including the use of IPv4-mapped addresses in ...
The packet is then forwarded to the external network. The NAT device then makes an entry in a translation table containing the internal IP address, original source port, and the translated source port. Subsequent packets from the same internal source IP address and port number are translated to the same external source IP address and port number.
IANA, who allocate IP addresses globally, have allocated the single IP address 0.0.0.0 [1] to RFC 1122 section 3.2.1.3. It is named as "This host on this network". RFC 1122 refers to 0.0.0.0 using the notation {0,0}. It prohibits this as a destination address in IPv4 and only allows it as a source address under specific circumstances.
The header contains information about IP version, source IP address, destination IP address, time-to-live, etc. The payload of an IP packet is typically a datagram or segment of the higher-level transport layer protocol, but may be data for an internet layer (e.g., ICMP or ICMPv6) or link layer (e.g., OSPF) instead.
Source-specific routing, [1] also called source-address dependent routing (SADR), [2] is a routing technique in which a routing decision is made by looking at the source address of a packet in addition to its destination address. The main application of source-specific routing is to allow a cheap form of multihoming without the need for ...
The Cisco multicast router AUTO-RP-ANNOUNCE address is used by RP mapping agents to listen for candidate announcements. Yes 224.0.1.40 The Cisco multicast router AUTO-RP-DISCOVERY address is the destination address for messages from the RP mapping agent to discover candidates. Yes 224.0.1.41 H.323 Gatekeeper discovery address Yes 224.0.1.129–132