Hi,
I have a rather detailed question about the ARP cache. My system consists of approx. 300 units communicating with a server via UDP about every 20min. Since the number of devices exceeds the size of the ARP cache table by far, I assume that with each UDP telegram the device will have to resolve the MAC adr of the server. The documentation says: Every received IP or ARP packet is also processed by the ARP module, and the IP and MAC addresses are cached internally
Thus, since a device really only needs the MAC Adr of the server, I would like to permanently register the IP adress of the server in the ARP table which I can obviously do with arp_cache_ip(...,ARP_FIXED_IP). My question is: Will this entry be cleared whenever the table is full and new telegrams arrive, or will this entry be fix always?
Thank you for your help! Florian