The default SNMP ports are now configurable at build time (using the SNMP_IN_PORT and/or SNMP_TRAP_PORT defines in lwipopts.h).You also have to set MEMP_NUM_IGMP_GROUP large enough to support all needed IGMP groups. You have to set the NETIF_FLAG_IGMP flag for any netifs which should process IGMP messages. A new IGMP_STATS option enables specific statistics. Enable IGMP support for all API layers (IP_ADD_MEMBERSHIP, IP_DROP_MEMBERSHIP, IP_MULTICAST_TTL, and IP_MULTICAST_IF). As with many options in lwIP, disabling this is not RFC compliant, but may not be useful depending on your application. Enable UDP Lite support for all API layers. New LWIP_UDPLITE option in lwipopts.h.In 1.2.0 and earlier, lwIP always used a static buffer to split packets into fragments, but now it is possible to disable this, and instead pbufs are allocated and referenced for each fragment in order to send the fragmented packet data. New IP_FRAG_USES_STATIC_BUF option in lwipopts.h.You should no longer call etharp_init in your port's initilization sequence if you use tcpip.c, because this call is done in tcpip_init function.etharp.c now requires a MAC address to be 6 bytes since our ARP is currently only used with Ethernet.Your driver should (probably) no longer need to do this. The netif_set_up function now generates a 'gratuitous ARP' when the netif is brought up.Previous problems with this option have been fixed. connection) to maintain a cache pointing into the ARP table, instead of having to scan the whole ARP table each time. New LWIP_NETIF_HWADDRHINT option in lwipopts.h.Enable this to allow any incoming IP packet to update the ARP table. New ETHARP_TRUST_IP_MAC option in lwipopts.h.New NETIF_FLAG_ETHARP flag for Ethernet netifs.Bear in mind that these notes only cover the differences between 1.2.0 and 1.3.0. The following are some particular notes and gotchas that you should be aware of if you are updating your code from 1.2.0 to 1.3.0. The file netif/ethernetif.c provides a 'good practice' example of an ethernet interface driver written for the 1.3.0 code base. Please refer to the CHANGELOG for a complete list of all changes made in version 1.3.0. Note: Version 1.3.0 has been finalized and released.

Lwip loopback cable