yellow jacket

n 1: a barbiturate (trade name Nembutal) used as a sedative and

hypnotic and anti-spasmodic [syn: {pentobarbital sodium},

{pentobarbital}, {Nembutal}]

2: small yellow-marked social wasp commonly nesting in the

ground [syn: {yellow hornet}, {Vespula maculifrons}]

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.

(1999-11-02)