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Following this discussion:

ARP request outside of LAN; Target machine or router response?

I'd like to understand if router 1 sends its frames to router 2 through the same ARP process as discussed for LAN. In a few words, does communication among routers need MACs (and ARP request possibly)in order to send their frames?

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When routers are connected by Ethernet (or another MAC-based L2 protocol) they need to use ARP or NDP to resolve the next hop's IPv4 or IPv6 address - just like an end node.

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