lwIP is very modular and has support for a wide variety of protocols, most of which can be removed for smaller code size. * Link and network protocols: * ARP, a link-layer protocol used to translate a native hardware address (i.e., "MAC address") into an IP address * IPv4, the dominant network-layer protocol used today, particularly in the internet * IPv6, the successor to IPv4, which, in particular, expands the size of the IP address to 128 bits * ICMP, a control protocol for IP * IGMP, a management protocol for multicast groups in IP * Transport protocols * UDP, a connectionless sockets protocol without any reliability mechanisms * TCP, a connection-oriented protocol for "streaming" * High-level protocols * DHCP, an IP address acquisition met