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.














its sales team have run out of addresses, but R&D have some spare. If R&D are using less than half of the 256 addresses in their /24 say, then a /25 could be reclaimed and assigned to sales. IPv6 can subnet too. It uses the CIDR notation developed for IPv4 as well, which is a way of specifying the size of a network in addition to the actual network number. An example from IPv4 is, which is the old "class B" network of University College Dublin. Similarly, 2001:770:10::/48 is the

matches destination. 2 Prefer if appropriate scope. 3 Avoid if addresses are deprecated. 4a Prefer addresses that are simultaneously home and care-of. 4b Prefer home addresses over care-of (may have sense reversed by configurable setting). 5 Prefer address on interface closest to destination. 6 Prefer if policy label of source matches destination. 7 Prefer public addresses (may have sense reversed by configurable setting). 8 Use longest matching prefix. Table

of IPv4 addresses, akin to dialup hosts sharing addresses out of a pool. The fact that these dual-stacked hosts can originate and receive IPv6 and IPv4 packets is extremely powerful, allowing them to form a connection between IPv4 and IPv6 networks. We'll look at ways in which this is possible next. Configured Tunnelling This is, in many ways, the simplest of transition mechanisms, although it is not as easily maintainable as others because it involves manually configuring some

plan to do some small scale testing, you may want to add names for some of the IPv6 addresses you will be using. For small scale testing, setting up DNS records (as we describe in Section 6.1 of Chapter 6) may be too heavy-duty, especially if the DNS server is not under your direct control. For this type of situation, it may be sufficient to add addresses to the /etc/hosts file, or its equivalent. Table 5-9 shows how to configure DNS resolving over IPv6, if it is available.[11] In some cases,

this problem would be to become a POP for some tunnel broker service such as http://www.sixxs.net/. We'll talk about the more service-oriented transition mechanisms, application proxies and port forwarding in particular, in Chapter 7. 6to4 Relay Routers Setting up a 6to4 relay router is actually quite a good way for an ISP to begin offering IPv6 services. Currently if an ISP's customers use 6to4 as a way to experiment with IPv6, their traffic may travel around the world before reaching

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