Qunar Tech Salon

Dec 22, 2020 · Operations

Analysis of ARP Cache Behavior and Failover Issues in a Dual‑Firewall Environment

This article details a network outage caused by ARP cache state transitions, neighbor reachability detection differences between Linux 6.0/7.0, Cisco NXOS ARP timeout, and keepalived standby handling, explaining how these factors led to traffic disruption and the eventual root‑cause resolution.