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
- High-level protocols
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