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.
- Hell or high water
Related Terms come hell or high water
[hel-rey-zer] /ˈhɛlˌreɪ zər/ noun, Informal. 1. a person who behaves in a rowdy, riotous manner, especially habitually. n. 1914 (to raise hell is from 1896), from hell + agent noun from raise (v.). noun
- Hell to pay
noun phrase A very large fuss with dangerous implications; violent repercussions: Hell to pay, in other words, for anyone who was unyielding (1901+) Great trouble, as in If we’re wrong there’ll be hell to pay. [ c. 1800 ]
[hel-uh-vuh] /ˈhɛl ə və/ adjective, adverb, Pronunciation Spelling. 1. hell of a (used as an intensifier): We had a helluva time getting through the heavy traffic. She’s a helluva good player! /ˈhɛləvə/ adverb, adjective (informal) 1. (intensifier): a helluva difficult job, he’s a helluva guy 2. (South African) (intensifier): it’s helluva tough out here adj. […]