Mobile IPv6

Laboratory Work

Introduction

This work consists in configuring an IPv6 network supporting mobility and in making a set of experiences used to improve your understanding about Mobile IPv6. The software installed in the lab computers is the MIPL Mobile IPV6 for Linux which implements the mobile IPv6 draft-ietf-mobileip-ipv6-24.txt.

In order to become familiar with the MIPL software package you should read first the following man pages and configuration examples:

This work will also demand the configuration and the activation of radvd, which is responsible for the periodic dissemination of router advsertisment messages. The following information shall be studied:

The MIPv6 Configuration

The laboratory will be configured as follows.

                       quadro
                                                   porta


banc_3                                            banc_6
pc4---[HUB]---pc3----+            +----pc3---[HUB]---pc4
2000:0:0:3::/64      |            |      2000:0:0:6::/64
                     |            |
banc_2               |            |               banc_5
pc4---[HUB]---pc3--[HUB]-+    +-[HUB]--pc3---[HUB]---pc4
2000:0:0:2::/64     | |  |    |  | |      2000:0:0:5::/64
                    | |  |    |  | |
banc_1              | |  |    |  | |               banc_4
pc4---[HUB]---pc3---+ |  |    |  | +----pc3---[HUB]---pc4
2000:0:0:1::/64       |  |    |  |       2000:0:0:4::/64
                      |  |    |  |
                     cne |    |  cnd
           2000:0:0:e::c |    |  2000:0:0:d::c
                         |    |
          2000:0:0:e::/64|    |2000:0:0:d::/64
                         |    |
                       [routerv6]

Each group is responsible for configuring its
PCs (tuxy4 and tuxy3) as follows:

tuxy4, Mobile Node (MN) 
eth0=2000:0:0:y::1 
  |
  | rede da bancada y = 2000:0:0:y::/64
  |
eth0=2000:0:0:y::aa 
tuxy3, router da rede y, Home Agent (HA), and radvd for 2000:0:0:y::/64
eth1= 2000:0:0:e|d::y
  |
  | rede de interligacao:
  | - do lado esquerdo do lab  2000:0:0:e::/64 (e, de esquerdo)
  | - do lado direito  do lab  2000:0:0:d::/64 (d, de direito)
  |
eth?=2000:0:0:e|d::aa 
routerv6    (este router e' configurado pelo Prof/Tecnico)

Steps of the work

The following steps shall be carried out:

Interconnect tuxy3 and tuxy4 by a hub/switch. Make sure that this layer 2 network is isolated.
Interconnect tuxy3 to the lab linux router via the direita/esquerda hub/switch.
Make a connection between your bancada and one of the other bancadas of your side of the lab, so that the mobile node (tuxy4) may visit another bancada.
Configure tuxy3 as a router and verify its connecivity using the ping6 command. As usual, you can use the commands:
- ifconfig (ex. /sbin/ifconfig eth0 inet6 add 2000:0:0:4::1/64),
- route, (ex. /sbin/route -A inet6 add 2000::/3 gw 2000:0:0:1::aa)
- route, (ex. /sbin/route -A inet6 add 2000:0:0:4::/64 dev eth0)
Do not forget to do
- /etc/network/options, set_ip_forward=yes
- echo "1" > /proc/sys/net/ipv6/conf/all/fowarding
Configure and start radvd in tuxy3, so that so tuxy3 can start announcing the network prefix for your bancada network (2000:0:0:y::/64). Make sure the home agent facility is configured and observe the router advertisment messages by using ethereal and capturing messages in eth0
Configure and start tuxy3 as an HomeAgent
Start Ethereal in tuxy4, eth0.
Configure and start tuxy4 as a Mobile Node.
Observe the IP addresses of tuxy4, in particular the auto-configured addresses. Save them
Observe the routes in tuxy3.
Ping6 the Correspondant Node of the other side of the lab.
Make the Mobile Node to visit the network of another bancada. While doing that, observe the output of ping6
As soon as the ping6 resumes, on the visited bancada, stop the ethereal and save the log. Observe also the IP addresses of tuxy4, in the visited network.
Observe the interfaces and routes configured in tuxy3. Save both of them.
Try to understand the ethereal log and, in particular, the messages which are relevant to mobility.

Questions to answer at home

Please remember: 1) not more than 2 A4 pages; 2) deliver it in the next lab.

When the MN is at home, what are the IPv6 addresses associated to eth0 and how were they formed?
When the MN is at the visited network, what are the routes defined at the HA? Please explain them.
Using the ethernet log obtained in tuxy4, please identify the signalling messages taht are related to mobility. Please explain their meaning.
After route optimisation, the MN and the CN exchange packets directly. Identify the echo request and echo reply packets observed after route optimisation, and explain the values observed for each of the fields related to mobility (IP addresses, destination and routing headers).