• Setting up IPv6 in a home network
• What is the IPv6 loopback ip address?
• How to Calculate the Subnet of an ip for your network.
• HOWTO Setup an IPv6 Masquerade Box Under Debian GNU/Linux Through IPv4
• Will Windows Server 2003 handle IPv6 better?

This document is meant as a showcase on how to add IPv6 to an existing IPv4 (home) network. The network in question is somewhat more complicated than your average home network. It has for instance two connection to the Internet. This documents describes the current layout of the LAN, how we added IPv6 to it and ends with a list of problems and a conclusion.

By adding IPv6 to a home setup one will receive a few advantages:

1. No more natting (at home),
2. Redundant email connection,
3. Global routable addresses for my servers,
4. P2P apps work.

Full how to here;
»www.nlnetlabs.nl/ipv6/case-studi···et/ipv6/
part 2 here;
»www.nlnetlabs.nl/ipv6/case-studi···6-take2/

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by ironwalker
last modified: 2005-03-16 23:15:11

It is 0:0:0:0:0:0:0:1

It can also be expressed as ::1

IPv6 Subnetting;
The design of the IPv6 address space differs significantly from IPv4. The primary reason for subnetting in IPv4 is to improve efficiency in the utilization of the relatively small address space available, particularly to enterprises. No such limitations exist in IPv6, as the address space available even to end-users is large.
An IPv6 subnet always has 64 bits in its host portion. It therefore has a /64 routing prefix (the 64 most-significant bits). Although it is technically possible to use smaller subnets, they are impractical for local area networks because stateless address autoconfiguration of network interfaces (RFC 4862) requires a /64 address. IPv6 does not implement special address formats for broadcast traffic or network numbers, and thus all addresses in a subnet are valid host addresses.
The recommended allocation for an IPv6 customer site is an address space of 80 address bits (prefix /48), but it may be as small as 72 bits (/56 allocation) for a residential customer network.[4] This provides 65,536 subnets for a site, or at least a minimum of 256 subnets for a residential network. Subnetting in IPv6 is used to route traffic between the global allocation spaces and within customer network between subnets and the larger Internet. Subnetting in IPv6 is also based on the concepts of Classless Inter-Domain Routing and the standard CIDR notation is used with IPv6 addresses.

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by Harddrive edited by ironwalker
last modified: 2010-02-18 23:49:33

An IP address is a 32-bit binary code (often written in the decimal-dot form) that contains network and host parts. The host bits define a particular computer.
The network prefix determines a network; its length depends on the network class.
Subnetting helps to organize a network by breaking it into several subnets. To define such subnets, you must take bits from the host portion of the IP address. That also extends the network prefix. The subnet mask explicitly defines network and host bits as 1 and 0, respectively.
Below, is a calculation of a subnet mask for a computer with IP address 192.35.128.93 that belongs to network with six subnets.

Step 1
Determine the network class (A, B or C) based on IP address:
* If IP addresses begin with 1 to 126, it is Class A.
* If IP addresses begin with 128 to 191, it is Class B.
* If IP addresses begin with 192 to 223, it is Class C.
In our example, the network is class C since the IP address 192.35.128.93 start with 192.

Step 2
Determine number of bits needed to define subnets:
* Number of subnets = (2^Number of bits) - 2. Hence,
* Number of bits = Log2(Number of subnets + 2).
In our example, there are six subnets:
* Number of bits = Log2(6 + 2) = Log2(8) = 3. Three bits in the IP address are used as a subnet portion.

Step 3
Compose the subnet mask in binary form by extending the default subnet mask with subnet bits. Default subnet mask for classes A to C are:
* 11111111.00000000.00000000.00000000 (Class A, network part is 8 bits)
* 11111111.11111111.00000000.00000000 (Class B, network part is 16 bits)
* 11111111.11111111.11111111.00000000 (Class C, network part is 24 bits)
In our example, an extension of the default class C subnet mask with 3 bits (Step 2) results in the subnet mask
11111111.11111111.11111111.11100000.

Step 4
Convert the binary subnet mask to the decimal-dot form. The binary form contains four octets (8 bits in each). Use following rules:
* For "1111111" octet, write "255".
* For "00000000" octet, write "0".
* If octet contains both "1" and "0" use the formula:
Integer number = (128 x n) + (64 x n) + (32 x n) + (16 x n) + (8 x n) + (4 x n) + (2 x n) + (1 x n)
Where "n" is either 1 or 0 in the corresponding position in the octet sequence.
In our example, for 11111111.11111111.11111111.11100000
11111111 ---> 255
11111111 ---> 255
11111111 ---> 255
11100000---> (128 x 1) + (64 x 1) + (32 x 1) + (16 x 0) + (8 x 0) + (4 x 0) + (2 x 0) + (1 x 0) = 224
Subnet mask is 255.255.255.224.

You can also use one of the many online Subnet calculators available on the net.
Here is one, »www.subnetonline.com/pages/subne···ator.php

To subnet the IPv6 address space, you use same ipv4 subnetting techniques to divide the 16-bit Subnet ID field for a 48-bit global or unique local address prefix in a manner that allows for route summarization and delegation of the remaining address space to different portions of an IPv6 intranet.
You need not subnet in any specific fashion. The subnetting technique described here assumes that you subnet by dividing the variable portions of the address space of the Subnet ID field using its high-order bits. Although this method promotes hierarchical addressing and routing, it is not required. For example, in a small organization with a small number of subnets, you can also easily create a flat addressing space for global addresses by numbering the subnets starting from 0.

More detailed information and examples for ipv4 and ipv6 here;
»technet.microsoft.com/en-us/libr···997.aspx

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by ironwalker
last modified: 2010-06-06 08:19:04

(with windows and linux clients)

Let us proceed with the installation routine. The following is an outline of steps. First, install IPv6 and IPv6 netfilter support into your kernel. Then, add IPv6 support into your IPv4 firewall. Don't forget to sign up for an account with Freenet6. Use the Debian package manager (APT) to install freenet6, radvd, dnsmasq, iputils-ping, and iputils-tracepath (apt-get install). Configure both freenet6 and radvd to work with your system and your individual configuration. Finally, obtain an IPv6 firewall script for the gateway....read more here »cruisefx.justjohnnyweb.net/Docum···PV6.html

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by ironwalker

Windows Server 2003 provides better support for IPv6 and for some of its security mechanisms. However, it is important for administrators to be aware of the limitations of Server 2003’s implementation of IPv6 when it comes to security features. The information provided, will discuss both the theoretical and the practical aspects of using IPv6 to create a more secure network environment with Microsoft’s latest server operating system. This is an overview of Microsoft’s IPv6 implementation and is not intended to be a complete guide to implementing IPv6 on your network. Read more here ...

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by ironwalker edited by Optimized
last modified: 2004-03-05 20:13:10