IPv6 Configurations

EUI 64:

The hostaddress is generated from the host's MAC-address, by setting the second beit in the second hexadecimal number of the MAC-adderss to high and adding FF:FE in the middle of the MAC-address.
Example:
MAC: 00:1A:11:77:5B:CE
Host-Ad.: 02:1A:11:FF:FE:77:5B:CE
The problem about EUI64 is, that everyone is able to get your MAC-address (which always stays the same for your device). So companies can get more information about your behavior on the internet.

Random:

A 2⁶⁴ bit hostaddress is generated randomly.

^Static:

^{The hostddress is set manually at every host.}

^{Auto config:}

^{The router sends a router advertisement. The router sends the network address to all notes. The host now knows the network address and its default gateway, because the sending address is also the link-local address. 
If the host does not want to wait for a router advertisement, it sends an all router multicast and asks for the network address. The router answers with an all notes multicast.}

^{DAD: Duplicate Address Detection}

^{The host sends a multicast to see if another host has the same IP-Address. If it gets an answer, the host stops and waits for the superuser to do something.}

^{8.3.1.4 Implementing a Subnetted IPv6 Addressing Scheme}

 

^{In this exercise you should practice configuring PCs with IPv6 Auto Config. To make the network below work, you have to configure the IPv6 address of the interfaces on the two routers like we did in the last exercise. But before you can do this, you have to fill in the addressing table like the one shown below.}

VLSM - Variable Length Subnet Mask

Packet Tracer Exercise 8.2.1.4

If there are subnets with different ammounts of hots needed, VLSM is used. In this exercise you recive one of three different setups. You have to design a VLSM addressing scheme and configure the devices using the addressing scheme.

In one of the setups you need:

• One LAN with 14 hosts (ASW-1)
• One LAN with 30 hosts (ASW-2)
• One LAN with 6 hosts (ASW-3)
• One LAN with 60 hosts (ASW-4)

To get the IP-Addresses for the subnets you first need to sort the networks from subnets with most to least hosts.

• ASW-4 (60 hosts) - 6 bits needed to display
• ASW-2 (30 hosts) - 5 bits
• ASW-1 (14 hosts) - 4 bits
• ASW-6 (6 hosts) - 3 bits

To understand what values you need for the subnetmask the picture below shows the number of hosts for one subnet and the network-addresses.

Over the whole square you have 256 values (8 bit). In 1/4 of the square you have 64 values (6 bit). In 1/8 of the square we have 32 values (7 bit). . .

The network is always the first address in the subnet so now we can see where the first addresses in the subnet are.

One lesson two Exercises with Packet Tracer

Exercise 7.4.1.2 - Skills Integration Challange

In this exercise you have to configure the last few parts of a network for two restaurants, that share one connection. The addressing table is given. Everything should be connected in the end.

To set the IP-addresses on the Switch you need to go into the conf t mode, go into the int vlan 1 and then set the IP-address like on the router.
To set the default gateway you need (config)#ip default-gateway 172.16.10.1

8.1.4.7. Subnetting Scenario 1

In this exercise you need to setup 5 subnets (4 for the switches, one for the WAN). Therefor you need three bits for subnetting and need /27 address. With this knowledge and your knowledge about subnetting you are able to fill in the addressing table below.

We can answer the questions from Step 1:

a.)Based on the topology, how many subnets are needed?

5

b.)How many bits must be borrowed to support the number of subnets in the topology table?

3

c.)How many subnets does this create?

There can be up to 8 subnets.

d.)How many usable hosts does this create per subnet?

30

One Lesson - Three exercises

First Exercise - 7.2.4.9. Configuring IPv6 Addresses

In a network you have to configure the IPv6 addresses for the router, server and the clients and test the connection.

R1(config)# ipv6 unicast-routing has to be used, so that the router forwards IPv6 packets.
The router's interfaces are configured the same way as in IPv4 but you have to add ipv6 in the beginning.
After that you have to enable ipv6 in all Interfaces and set the link-local address with the command:
ipv6 address FE80::1 link-local

Now the clients and the server in the subnet are connected. But you aren't able to ping e.g. the server in the other network. To connect the subnets you have to change the gateway to the router's Interface.

         Second Exercise - 7.3.2.5 Verifying IPv4 and IPv6 Addressing 

 

This network is already configured.  With the commands ipv6config and tracert the network has to be tested.

 

This is how a tracert should look like.

       Third Exercise - 7.3.2.9 Troubleshooting IPv4 and IPv6 Addressing

In this exercise you get three differt issues (dislayed below). You are Level 2 support and have to find solutions for the problems.

PC1: Missing Default Gateway

PC2: Wrong DNS Server IP

PC3: Wrong IPv6 Default Gateway