Case Project 5-1: Determining Default Gateway Settings Let’s say you have reconfigured a network using brand-new routers. You are not certain if you configured the most appropriate default gateway settings for your hosts. How can you use an analyzer to determine if your default gateway settings are appropriate?

Case Project 5-2: ICMPv6 Security Issues You are asked to check your company’s configurations to determine if any filters should be built to stop certain ICMPv6 traffic. Your supervisor asks for a list of ICMPv6 traffic or issues that are of concern and the reasons why such concerns could be a problem. Build a list for your supervisor. Include packet types or specific circumstances in which ICMPv6 traffic could compromise network security.

Case Project 5-3: Testing PMTU Discovery You moved to San Diego to work with a large sports apparel company. Its network grew through various corporate acquisitions—it is truly a mix of media, speeds, computers, and applications. You are not sure if this network’s hosts and routers support PMTU Discovery to reduce fragments on the network. Write a brief plan defining how you can test this network for PMTU support.

Case Project 5-4: Researching Jon Postel Throughout the RFCs, you’ve noticed the initials JBP and the name Jon B. Postel. Access IANA’s Web site (www.iana.org) and search for information on Jon Postel. Write a single paragraph defining Jon Postel’s effect on the development of IP and related Internet protocols.