Tag
arp
- Dec 19, 2025 Neighbour Cache Staleness and Peers That Become Unreachable How ARP and Neighbor Discovery entries age through reachable, stale, and probe states, and why a stale entry keeps sending traffic to an address that has moved. networking
- Nov 15, 2025 ARP and the Neighbour Cache Lifecycle How an IPv4 address becomes a MAC address, why the cache entry has states rather than an expiry, and what happens to queued packets during resolution. networking
- Jun 15, 2025 How a Router Decides a Destination Is On-Link The difference between a route that names a neighbour and one that names a gateway, how the link-layer address is resolved, and what happens when resolution fails. networking