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HELLO packet

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- In the Open Shortest Path First (OSPF) communications protocol - which enables network routers to share information with each other, a HELLO packet is a special packet (message) that is sent out periodically from a router to establish and confirm network adjacency relationships. On networks capable of broadcast or multicast transmission, a HELLO packet can be sent from a router simultaneously to other routers to discover neighboring routers.

A BYE packet is a packet transmitted by a multicast participant to signify that the router is leaving the session.

Learn more about Network Security Best Practices and Products

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Securing Wireless Systems -- 'Build Your Own Security Lab: A Field Guide for Network Testing,' Chapter 9: Learn wireless networking basics and methods used to attack and secure wireless systems in Chapter 9 of 'Build Your Own Security Lab,' Securing Wireless Systems.
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LAST UPDATED:

11 Jul 2002

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More resources from around the web:

-	Cisco provides a tutorial about OSPF.

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