An IP route is a rule in a network device or routing table that tells packets where to go next so they can reach a destination network. Each route usually matches an IP prefix and points to a next hop, interface, or gateway. Routers, firewalls, and cloud control planes all rely on these entries to move traffic efficiently.
IP routes matter because removing, changing, or misconfiguring them can make services unreachable even when servers are still running. In cyber security, attackers may try to alter routes to redirect traffic, intercept data, or isolate victims, while defenders use route filtering, change control, and monitoring to prevent accidental or malicious changes. In large cloud environments, one bad routing update can affect many systems at once, so scoping and rollback are critical defenses.