|(networking, communications)||hello packet - 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.