Posted: Wed Oct 27, 2021 10:01 Post subject: How can ARP be forwarded?
ARP frame (Layer 2) can only be sent/received from one MAC address to another. When router forwards a packet (Layer 3) from WAN host to LAN client, the packet reaches LAN client, but MAC address of WAN host is discarded by router and LAN client receives WAN host packet with router ARP frame. Is that correct or not?
So if LAN DNS server is not router and IP forwarding on LAN DNS server is disabled via SysCTL and IPTables, then LAN DNS server only needs INPUT and OUTPUT of ARP requests from LAN clients and router. It doesn't need/use any ARP forwarding, does it?
word of advice is to control all kinds of spoofing.
DNS is part of everything, even arp. arp spoofing
should help. generally you need to improve performance.
arp forwards itself. It already does. To improve
its performance you need to pay attention to router
discovery and neighbor discovery.