Packet Processing Interface to Interface, Part 1: Link Layer

• Do link layer CRC

• Queue packet for reading by the IP module

• Include the following information

• • Ingress interface
  • • For ICMP (saves a route lookup)
  • Media length
  • • For IP header check
  • Link layer destination type (uni-, multi-, broadcast)
  • • ICMP must not respond to broadcasts or multicasts
  • Link layer source address
  • • For ICMP (may save an ARP)