This read-write value sets the maximum hop count advertised in router advertisements and used in all IPv6 packets the router itself originates, from 1 to 255. An admin tunes this to control how far the router's own traffic and its advertised hop-limit guidance can travel before being discarded. For example, lowering this to 32 on a small local network limits how far router-originated packets can propagate if accidentally routed toward the wider internet.