| arp_entry | ARP packet header fields |
| ethernet_frame | Ethernet packet header fields |
| http_server_state | Structure that holds all the necessary state information for session management |
| ip_frame | IP datagram header fields |
| netif | Network Interface declaration |
| pop3c_struct | POP3 client structure |
| tcb | TCP transmission control block |
| tcp_frame | TCP header information |
| ucb | UDP control block |
| udp_frame | UDP header information |
1.2.18