IPv6 Network Administration

IPv6 Network Administration

Niall Richard Murphy, David Malone

Language: English

Pages: 594


Format: PDF / Kindle (mobi) / ePub

What once seemed nearly impossible has turned into reality. The number of available Internet addresses is now nearly exhausted, due mostly to the explosion of commercial websites and entries from an expanding number of countries. This growing shortage has effectively put the Internet community--and some of its most brilliant engineers--on alert for the last decade.Their solution was to create IPv6, a new Internet standard which will ultimately replace the current and antiquated IPv4. As the new backbone of the Internet, this new protocol would fix the most difficult problems that the Internet faces today--scalability and management. And even though IPv6's implementation has met with some resistance over the past few years, all signs are now pointing to its gradual worldwide adoption in the very near future. Sooner or later, all network administrators will need to understand IPv6, and now is a good time to get started.IPv6 Network Administration offers administrators the complete inside info on IPv6. This book reveals the many benefits as well as the potential downsides of this next-generation protocol. It also shows readers exactly how to set up and administer an IPv6 network.A must-have for network administrators everywhere, IPv6 Network Administration delivers an even-handed approach to what will be the most fundamental change to the Internet since its inception. Some of the other IPv6 assets that are covered include:routingintegrated auto-configurationquality-of-services (QoS)enhanced mobilityend-to-end securityIPv6 Network Administration explains what works, what doesn't, and most of all, what's practical when considering upgrading networks from the current protocol to IPv6.

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distributed ray tracer. In this case there are clients that connect to the server to find out what calculations need to be done, and the server then collects the results of these calculations. Note that each client deals with only one server, but the server must deal with many clients. Each client uses a single TCP connection and the code for creating the connection is contained in a single function, shown in Example 8-5. This code is pretty much a textbook example of IPv4 TCP client code; we

process the packet, even if, as must be the case in sufficiently large networks, the packet has nothing to do with the host. This can add up to phenomenal amounts of traffic on (badly-designed) flat networks. (There are urban legends floating around of a network on which it is impossible to plug in machines of below a certain specification, because they do not have the processing power to deal with the volume of ARP and other broadcast packets. If you find such a network, let us know.) Multicast

is overcoming barriers and finding growing acceptance and support within the Internet community. For an obscure networking protocol of current interest to a small fraction of the population of our planet, this combination of passion and ignorance seems remarkable. You might ask, `So why all the fuss?' The motivation behind IPv6 is the need to fix the most difficult problems that the Internet faces today: address exhaustion, network management, scalability issues, and multi-homing. It is the

Translation. The idea is that it allows you to take an IPv4 packet and rewrite the headers to form an IPv6 packet and vice versa. The IP level translations are relatively simple: TTL is copied to Hop Limit, ToS bits to traffic class, payload lengths are recalculated and fragmentation fields can be copied to a fragmentation header if needed. Since TCP and UDP haven't really changed, they can be passed through relatively unscathed. However the differences between ICMPv4 and ICMPv6 are more

IPv6 has been configured on systems after they are compromised, because the crackers know that IPv6 is less likely to be analyzed fully by IDSs. Help is at hand though. Snort 2 has experimental support for IPv6 (available from http://www.snort.org/) and Lance Spitzner has been talking about IPv6 and honeypots, which is likely to increase the level of interest and support in this area. * * * [12] On Linux, Solaris, and FreeBSD, at least. Providing Transition Mechanisms In this

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