<networking, communications> An OSPF packet sent periodically on each
network interface, real or virtual, to discover and test connections to
neighbours. Hello packets are multicast on physical networks capable of
multicasting or broadcasting to enable dynamic router discovery. They include
the parameters that routers connected to a common network must agree on.
Hello packets increase network resilience by, e.g., allowing a router to
establish a secondary connection when a primary connection fails.
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