RARP (contd)
- RARP cannot use IP
- Needs unique Ethernet frame type (0x8035)
- Works through a filter like BPF or nit_if/nit_pf streams modules (fig: A.1, A.2)
- Multiple RARP servers needed for reliability, but unlike ARP where only one reply is sent, each RARP sends a unicast reply => additional traffic
- Possibility of collision between RARP replies
- RARP servers cannot be consolidated since RARP requests are broadcasts => router cannot forward (relay) RARP requests