Re: [lwip-users] Using ARP to get MAC address

[Simon Goldschmidt]

> I am trying to get destination MAC address, when I know destination IP
> address for my packet offload mechanism.

I'm not sure that the etharp module exposes the correct functions to do what 
you want. The information should however be available in the arp cache. Using 
etharp_query() sounds correct (since you do want to send a query). Using 
etharp_find_addr() also sounds correct but I don't know why it would procude a 
gratuitous arp. I should only search the ARP table.

I guess first using etharp_query() to issue the request and then repeatedly 
using etharp_find_addr() to search the ARP table for the address should be the 
way to go. Maybe you need to re-issue the request with a timeout if you don't 
get a response.

Simon
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