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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.
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.
The combination of one internal IP address and a destination IP address and port is mapped to a single unique external source IP address and port; if the same internal host sends a packet even with the same source address and port but to a different destination, a different mapping is used.
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.
Ethernet packet. The SFD (start frame delimiter) marks the end of the packet preamble. It is immediately followed by the Ethernet frame, which starts with the destination MAC address. [1] In computer networking, an Ethernet frame is a data link layer protocol data unit and uses the underlying Ethernet physical layer transport mechanisms.
Example of Unknown unicast traffic where A is the source and B is the unknown destination Example of Multicast traffic to five destinations Broadcast traffic is used to transmit a message to any reachable destination in the network without the need to know any information about the receiving party.
At the transmitter, the calculation is performed before the packet is sent. When received at the destination, the checksum is recalculated, and compared with the one in the packet. If discrepancies are found, the packet may be corrected or discarded. Any packet loss due to these discards is dealt with by the network protocol.
Source Address: 32 bits The source address from the IPv4 header. Destination Address: 32 bits The destination address from the IPv4 header. Zeroes: 8 bits; Zeroes == 0 All zeroes. Protocol: 8 bits The protocol value for UDP: 17 (or 0x11). UDP length: 16 bits The length of the UDP header and data (measured in octets).