# What's ARP Got to Do with It?

DevFeed: [What's ARP Got to Do with It?](<https://devfeed.tech/articles/what-s-arp-got-to-do-with-it-11452.md>)

Original publisher: [Read original article](<https://labs.ripe.net/author/remco-van-mook/whats-arp-got-to-do-with-it/>)

Author: Remco van Mook

Published: 2026-07-23T06:35:41Z

Content type: article

Language: en

Sources: [RIPE Labs](<https://devfeed.tech/sources/ripe-labs.md>)

Topics: [Internet](<https://devfeed.tech/topics/internet.md>), [Network](<https://devfeed.tech/topics/network.md>), [Networks](<https://devfeed.tech/topics/networks.md>), [FIRST](<https://devfeed.tech/topics/first.md>)

Tags: [arp](<https://devfeed.tech/tags/arp.md>), [article](<https://devfeed.tech/tags/article.md>), [enterprise](<https://devfeed.tech/tags/enterprise.md>), [ietf](<https://devfeed.tech/tags/ietf.md>), [internet](<https://devfeed.tech/tags/internet.md>), [internet-infrastructure](<https://devfeed.tech/tags/internet-infrastructure.md>), [ipv4](<https://devfeed.tech/tags/ipv4.md>), [network](<https://devfeed.tech/tags/network.md>), [networks](<https://devfeed.tech/tags/networks.md>)

## AI overview

The article examines why ARP still matters by distinguishing durable demand for IPv4 reachability from the local-network architecture traditionally used to provide it. It argues that many access and hosting segments isolate subscribers or tenants and use the local IPv4 subnet mainly as a mechanism for reaching the gateway, rather than for lateral communication.

## Source excerpt

It's only ARP. It works. So how much can it really matter? The answer lies beyond ARP itself, in the IPv4 layer cake that grew around it over four decades. The IPv4 internet is not going away in bounded time, and nobody should pretend otherwise.