IP Packet Header(Continued) Two P addresses Source IP address( 32 bits) Destination IP address( 32 bits) Destination address Unique identifier/locator for the receiving host Allows each node to make forwarding decisions Source address Unique identifier/locator for the sending host Recipient can decide whether to accept packet Enables recipient to send a reply back to source 3131 IP Packet Header (Continued) • Two IP addresses –Source IP address (32 bits) –Destination IP address (32 bits) • Destination address –Unique identifier/locator for the receiving host –Allows each node to make forwarding decisions • Source address –Unique identifier/locator for the sending host –Recipient can decide whether to accept packet –Enables recipient to send a reply back to source