https://nalar.dev/tags/ip/ Recent content in IP on Nalar Hugo en-us Tue, 15 Sep 2026 00:00:00 +0700 https://nalar.dev/path-mtu-discovery-finds-the-largest-packet-a-route-can-carry/ Tue, 15 Sep 2026 00:00:00 +0700 https://nalar.dev/path-mtu-discovery-finds-the-largest-packet-a-route-can-carry/ <p>A host can know the maximum transmission unit of its own network interface without knowing the smallest limit farther along a route. Ethernet might accept one packet size while a tunnel, access link, or other intermediate network accepts less.</p> <p>Path MTU Discovery, commonly shortened to PMTUD, lets an endpoint adapt to that route-level limit. The mechanism matters because an IP packet that fits the sender&rsquo;s local link can still be too large for a later hop.</p>