old-www/HOWTO/Mobile-IPv6-HOWTO/testbed.html

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CLASS="sect1"
><H1
CLASS="sect1"
><A
NAME="testbed"
></A
>4. Test bed</H1
><P
>Now you should have a working MIPL patched kernel, installed
userlevel tools and enabled automatic startup at boot. If anything
went wrong, go through the above sections carefully.</P
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="testcase"
></A
>4.1. Testcase</H2
><P
>The addresses we are using in our test-bed are
site-local. You may as well use global addresses, but do
<EM
>note that link local addresses won't work!</EM
>
Our test-bed consist of four nodes; see figure
<A
HREF="testbed.html#mipv6testbed"
>"Mobile IPv6 testbed"</A
>.</P
><P
></P
><OL
TYPE="1"
><LI
><P
><EM
>HA - Home Agent:</EM
> The HA is located at the home
network with address <TT
CLASS="userinput"
><B
>fec0:106:2700::2</B
></TT
>,
with one wireless interface.</P
></LI
><LI
><P
><EM
>MN - Mobile Node:</EM
> When MN is on the
<SPAN
CLASS="QUOTE"
>"home network"</SPAN
>, it has address
<TT
CLASS="userinput"
><B
>fec0:106:2700::4</B
></TT
>. When MN travels to
another network, it generates a new <SPAN
CLASS="QUOTE"
>"care-of"</SPAN
> address.</P
></LI
><LI
><P
><EM
>R - Router:</EM
> This is the router from
the home network to the internet. It has one wireless interface with
address <TT
CLASS="userinput"
><B
>fec0:106:2700::1</B
></TT
> and a wired
interface with address <TT
CLASS="userinput"
><B
>fec0:106:2300::2</B
></TT
>.
</P
></LI
><LI
><P
><EM
>AR - Access Router:</EM
> The link
between AR and R is our <SPAN
CLASS="QUOTE"
>"internet"</SPAN
> - but in this
testcase only a cross-cable (can be any network). The AR has
two interfaces; the wired interface to R has address
<TT
CLASS="userinput"
><B
>fec0:106:2300::1</B
></TT
>, the wireless has
address <TT
CLASS="userinput"
><B
>fec0:106:1100::1</B
></TT
>.</P
></LI
></OL
><DIV
CLASS="mediaobject"
><P
><IMG
SRC="images/mipv6-testbed.png"
ALIGN="center"
WIDTH="550px"><DIV
CLASS="caption"
><P
>Mobile IPv6 testbed</P
></DIV
></P
></DIV
></DIV
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="stepbystep"
></A
>4.2. Step-by-step configuration</H2
><DIV
CLASS="sect3"
><H3
CLASS="sect3"
><A
NAME="fullyipv6"
></A
>4.2.1. Setting up a fully functional IPv6 network</H3
><P
>Before we can start testing mobile IP, we need a fully
functional IPv6 network. All the nodes should be able to ping
each other. <EM
>This is a crucial part.</EM
> If, for
example, AR is not able to ping HA, then there will be no binding
update.</P
><P
>I will give a brief instruction to get our network up and
running using IPv6. For more info on setting up an IPv6 network,
you can read Peter Bieringer's excellent <A
HREF="http://ldp.linux.no/HOWTO/Linux+IPv6-HOWTO/"
TARGET="_top"
>Linux IPv6
HOWTO</A
>.</P
><P
>I've turned off encryption for simplicity - <EM
>NOTE that you
should ALWAYS use encryption when dealing with wireless
networks!</EM
></P
><P
><EM
>Also note that the different wireless networks
have different ESSIDs!</EM
></P
><P
></P
><OL
TYPE="1"
><LI
><P
><EM
>MN:</EM
> The Mobile Node has one wireless
interface. Forwarding should be turned off, but should accept
autoconf and ra's:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
>&#13; # iwconfig eth0 mode ad-hoc essid homenet enc off
# ifconfig eth0 inet6 add fec0:106:2700::4/64
# echo "0" &#62; /proc/sys/net/ipv6/conf/eth0/forwarding
# echo "1" &#62; /proc/sys/net/ipv6/conf/eth0/autoconf
# echo "1" &#62; /proc/sys/net/ipv6/conf/eth0/accept_ra
# echo "1" &#62; /proc/sys/net/ipv6/conf/eth0/accept_redirects
# /etc/init.d/mobile-ip6 start
</PRE
></FONT
></TD
></TR
></TABLE
></LI
><LI
><P
><EM
>HA:</EM
> The Home Agent has one
wireless interface. It should have forwarding turned on
because it uses normal routing to deliver packets captured
from a physical interface to the virtual tunnel
interface. <EM
>Note: You must add a default route or else
HA will have problem contacting the MN on visited LAN's. One
possible solution is to use HA as the default router of the
home network.</EM
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
>&#13; # iwconfig eth0 mode ad-hoc essid homenet enc off
# ifconfig eth0 inet6 add fec0:106:2700::2/64
# echo "1" &#62; /proc/sys/net/ipv6/conf/eth0/forwarding
# echo "0" &#62; /proc/sys/net/ipv6/conf/eth0/autoconf
# echo "0" &#62; /proc/sys/net/ipv6/conf/eth0/accept_ra
# echo "0" &#62; /proc/sys/net/ipv6/conf/eth0/accept_redirects
# ip route add ::/0 via fec0:106:2700::1
# /etc/init.d/mobile-ip6 start
</PRE
></FONT
></TD
></TR
></TABLE
></LI
><LI
><P
><EM
>R:</EM
> The (home) Router has two
interfaces; one wireless and one line. The Router must have
forwarding turned on. </P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
>&#13; # ifconfig eth0 inet6 add fec0:106:2300::2/64
# iwconfig eth1 mode ad-hoc essid homenet enc off
# ifconfig eth1 inet6 add fec0:106:2700::1/64
# echo "1" &#62; /proc/sys/net/ipv6/conf/all/forwarding
# echo "0" &#62; /proc/sys/net/ipv6/conf/all/autoconf
# echo "0" &#62; /proc/sys/net/ipv6/conf/all/accept_ra
# echo "0" &#62; /proc/sys/net/ipv6/conf/all/accept_redirects
# ip route add fec0:106:1100::/64 via fec0:106:2300::1
</PRE
></FONT
></TD
></TR
></TABLE
></LI
><LI
><P
><EM
>AR:</EM
> The Access Router (on a foreign
network) also has two interfaces; one wireless and one
line. Forwarding must be turned on.</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
>&#13; # ifconfig eth0 inet6 add fec0:106:2300::1/64
# iwconfig eth1 mode ad-hoc essid visitnet enc off
# ifconfig eth1 inet6 add fec0:106:1100::1/64
# echo "1" &#62; /proc/sys/net/ipv6/conf/all/forwarding
# echo "0" &#62; /proc/sys/net/ipv6/conf/all/autoconf
# echo "0" &#62; /proc/sys/net/ipv6/conf/all/accept_ra
# echo "0" &#62; /proc/sys/net/ipv6/conf/all/accept_redirects
# ip route add fec0:106:2700::/64 via fec0:106:2300::2
</PRE
></FONT
></TD
></TR
></TABLE
></LI
></OL
><P
>Instead of modifying proc variables, you can use
<EM
>sysctl</EM
>.</P
><P
>Note: We are setting static routes on our test-bed. You
should now be able to ping all the hosts from every host.</P
></DIV
><DIV
CLASS="sect3"
><H3
CLASS="sect3"
><A
NAME="confmipv6"
></A
>4.2.2. Configuring Mobile IPv6</H3
><P
>The last configuration is MIPv6 settings in
<TT
CLASS="filename"
>network-mip6.conf</TT
>. In Debian/Slackware the
file is found under <TT
CLASS="filename"
>/etc/</TT
>. (RedHat the file
is found under <TT
CLASS="filename"
>/etc/sysconfig/</TT
>.) The file
should be pretty self-explanatory. </P
><P
></P
><OL
TYPE="1"
><LI
><P
><EM
>HA:</EM
> The HA config file should
contain these settings:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
>&#13; # cat /etc/network-mip6.conf
# Home Agent configuration file
FUNCTIONALITY=ha
DEBUGLEVEL=1
MIN_TUNNEL_NR=1
MAX_TUNNEL_NR=5
TUNNEL_SITELOCAL=yes
</PRE
></FONT
></TD
></TR
></TABLE
></LI
><LI
><P
><EM
>MN:</EM
> The MN config file should
look like this:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
>&#13; # cat /etc/network-mip6.conf
# Mobile Node configuration file
FUNCTIONALITY=mn
DEBUGLEVEL=1
TUNNEL_SITELOCAL=yes
MIN_TUNNEL_NR=1
MAX_TUNNEL_NR=3
HOMEDEV=mip6mnha1
HOMEADDRESS=fec0:106:2700::4/64 # MN's home adress
HOMEAGENT=fec0:106:2700::2/64 # HA's address
</PRE
></FONT
></TD
></TR
></TABLE
></LI
><LI
><P
>Next, start mobile-IP:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
>&#13; # /etc/init.d/mobile-ip6 start
Starting Mobile IPv6: OK
</PRE
></FONT
></TD
></TR
></TABLE
></LI
></OL
><P
>You can verify that it started by doing a
<TT
CLASS="userinput"
><B
>ifconfig</B
></TT
> on HA. If the tunnel(s) comes up,
<TT
CLASS="varname"
>ip6tnl1</TT
>, mobile-ip6 is started:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
>&#13; # ifconfig
eth1 Link encap:Ethernet HWaddr 00:02:2D:2D:DE:79
inet6 addr: fec0:106:2700::2/64 Scope:Site
inet6 addr: fe80::202:2dff:fe2d:de79/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:618 errors:6 dropped:6 overruns:0 frame:6
TX packets:1485 errors:22 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:87914 (85.8 KiB) TX bytes:252596 (246.6 KiB)
Interrupt:3 Base address:0x100
ip6tnl1 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 <A
NAME="tunnel1"
><IMG
SRC="../images/callouts/1.gif"
HSPACE="0"
VSPACE="0"
BORDER="0"
ALT="(1)"></A
>
UP POINTOPOINT RUNNING NOARP MTU:1460 Metric:1
RX packets:6 errors:0 dropped:0 overruns:0 frame:0
TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:576 (576.0 b) TX bytes:624 (624.0 b)
ip6tnl2 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 <A
NAME="tunnel2"
><IMG
SRC="../images/callouts/2.gif"
HSPACE="0"
VSPACE="0"
BORDER="0"
ALT="(2)"></A
>
UP RUNNING NOARP MTU:1460 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:8 errors:0 dropped:0 overruns:0 frame:0
TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:560 (560.0 b) TX bytes:560 (560.0 b)
</PRE
></FONT
></TD
></TR
></TABLE
><DIV
CLASS="calloutlist"
><DL
COMPACT="COMPACT"
><DT
><A
HREF="testbed.html#tunnel1"
><IMG
SRC="../images/callouts/1.gif"
HSPACE="0"
VSPACE="0"
BORDER="0"
ALT="(1)"></A
></DT
><DD
>The tunnel is up and ready for connections.</DD
><DT
><A
HREF="testbed.html#tunnel2"
><IMG
SRC="../images/callouts/2.gif"
HSPACE="0"
VSPACE="0"
BORDER="0"
ALT="(2)"></A
></DT
><DD
>Another tunnel ready.</DD
></DL
></DIV
><P
>You will also see the mipv6 kernel modules are loaded (MN):</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
>&#13; # lsmod
Module Size Used by Not tainted
mip6_mn 59888 0 (unused)
ipv6_tunnel 11448 1 [mip6_mn]
mip6_base 40728 0 [mip6_mn]
ipv6 179764 -1 [mip6_mn ipv6_tunnel mip6_base]
...
</PRE
></FONT
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="sect3"
><H3
CLASS="sect3"
><A
NAME="ARradvd"
></A
>4.2.3. Configuring radvd on AR</H3
><P
>When MN comes to a new network, it does a link-local address
configuration, going to the next phase if that succeeds. I'll let
<A
HREF="http://www.ietf.org/rfc/rfc2462.txt"
TARGET="_top"
>[RFC2462]</A
>
(IPv6 Stateless Address Autoconfiguration) describe the next
phase:</P
><P
>&#13; <SPAN
CLASS="QUOTE"
>"The next phase of autoconfiguration involves obtaining a Router
Advertisement or determining that no routers are present. If routers
are present, they will send Router Advertisements that specify what
sort of autoconfiguration a host should do. If no routers are
present, stateful autoconfiguration should be invoked."</SPAN
></P
><P
>&#13; <SPAN
CLASS="QUOTE"
>"Routers send Router Advertisements periodically, but the delay
between successive advertisements will generally be longer than a
host performing autoconfiguration will want to wait. To
obtain an advertisement quickly, a host sends one or more Router
Solicitations to the all-routers multicast group."</SPAN
> --- page 8</P
><P
>This is where we use
<A
HREF="http://v6web.litech.org/radvd/"
TARGET="_top"
>RADVD</A
>.</P
><P
>Read <A
HREF="http://www.ietf.org/rfc/rfc2462.txt"
TARGET="_top"
>[RFC2462]</A
>
more more details concerning IPv6 Stateless Address
Autoconfiguration.</P
><P
>We'll configure RADVD on AR's wireless interface. The
<TT
CLASS="filename"
>radvd.conf</TT
> file should contain this:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
>&#13; # cat /etc/radvd.conf
interface eth1
{
AdvSendAdvert on;
AdvIntervalOpt on;
MinRtrAdvInterval 3;
MaxRtrAdvInterval 10;
AdvHomeAgentFlag off;
prefix fec0:106:1100::/64
{
AdvOnLink on;
AdvAutonomous on;
AdvRouterAddr on;
};
};
</PRE
></FONT
></TD
></TR
></TABLE
><P
>We then start it:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
>&#13; # /etc/init.d/radvd start
</PRE
></FONT
></TD
></TR
></TABLE
><P
>You should now be able to use <TT
CLASS="userinput"
><B
>radvdump</B
></TT
> to
see that the radvd messages really are being sent periodically:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
>&#13; # radvdump
Router advertisement from fe80::202:2dff:fe54:d1b2 (hoplimit 255)
Received by interface eth1
# Note: {Min,Max}RtrAdvInterval cannot be obtained with radvdump
AdvCurHopLimit: 64
AdvManagedFlag: off
AdvOtherConfigFlag: off
AdvHomeAgentFlag: off
AdvReachableTime: 0
AdvRetransTimer: 0
Prefix fec0:106:1100::/64
AdvValidLifetime: 2592000
AdvPreferredLifetime: 604800
AdvOnLink: on
AdvAutonomous: on
AdvRouterAddr: off
AdvSourceLLAddress: 00 02 2D 54 D1 B2
</PRE
></FONT
></TD
></TR
></TABLE
><P
><EM
>Note! When using radvd on HA and enabling
<SPAN
CLASS="QUOTE"
>"autoconf"</SPAN
> (in proc), you will also get an
autogenerated IPv6 address on MN (which is superfluous) in
addition to your static address:</EM
></P
></DIV
><DIV
CLASS="sect3"
><H3
CLASS="sect3"
><A
NAME="radvdar"
></A
>4.2.4. Configuring radvd on HA</H3
><P
>&#13; To enable the MN to know when it's home, HA should also be sending
out RAs. We should therefore enable RADVD on the HA as well. The
<TT
CLASS="filename"
>/etc/radvd.conf</TT
> file should contain:
</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
>&#13; # cat /etc/radvd.conf
interface eth0
{
AdvSendAdvert on;
MaxRtrAdvInterval 3;
MinRtrAdvInterval 1;
AdvIntervalOpt off;
AdvHomeAgentFlag on;
HomeAgentLifetime 10000;
HomeAgentPreference 20;
AdvHomeAgentInfo on;
prefix fec0:106:2700::2/64
{
AdvRouterAddr on;
AdvOnLink on;
AdvAutonomous on;
AdvPreferredLifetime 10000;
AdvValidLifetime 12000;
};
};
</PRE
></FONT
></TD
></TR
></TABLE
><P
>Also do a <TT
CLASS="userinput"
><B
>radvdump</B
></TT
> on HA to check
whether radvd messages are beeing sent:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
>&#13; # radvdump
Router advertisement from fe80::202:2dff:fe54:d11e (hoplimit 255)
Received by interface eth0
# Note: {Min,Max}RtrAdvInterval cannot be obtained with radvdump
AdvCurHopLimit: 64
AdvManagedFlag: off
AdvOtherConfigFlag: off
AdvHomeAgentFlag: on
AdvReachableTime: 0
AdvRetransTimer: 0
Prefix fec0:106:2700::2/64
AdvValidLifetime: 12000
AdvPreferredLifetime: 10000
AdvOnLink: on
AdvAutonomous: on
AdvRouterAddr: on
AdvSourceLLAddress: 00 02 2D 54 D1 1E
AdvHomeAgentInfo:
HomeAgentPreference: 20
HomeAgentLifetime: 1000
</PRE
></FONT
></TD
></TR
></TABLE
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
>&#13; # ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:90:7D:F3:03:1A
inet6 addr: fec0:106:2700:0:290:7dff:fef3:31a/64 Scope:Site <A
NAME="newaddress"
><IMG
SRC="../images/callouts/1.gif"
HSPACE="0"
VSPACE="0"
BORDER="0"
ALT="(1)"></A
>
inet6 addr: fec0:106:2700::4/64 Scope:Site <A
NAME="staticadr"
><IMG
SRC="../images/callouts/2.gif"
HSPACE="0"
VSPACE="0"
BORDER="0"
ALT="(2)"></A
>
inet6 addr: fe80::290:7dff:fef3:31a/64 Scope:Link <A
NAME="linkaddrs"
><IMG
SRC="../images/callouts/3.gif"
HSPACE="0"
VSPACE="0"
BORDER="0"
ALT="(3)"></A
>
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:513 errors:89 dropped:89 overruns:0 frame:85
TX packets:140 errors:41 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:56084 (54.7 Kb) TX bytes:19212 (18.7 Kb)
Interrupt:3 Base address:0x100
</PRE
></FONT
></TD
></TR
></TABLE
><DIV
CLASS="calloutlist"
><DL
COMPACT="COMPACT"
><DT
><A
HREF="testbed.html#newaddress"
><IMG
SRC="../images/callouts/1.gif"
HSPACE="0"
VSPACE="0"
BORDER="0"
ALT="(1)"></A
></DT
><DD
>A new (superfluous) autogenerated address. Since we are
setting <TT
CLASS="userinput"
><B
>autoconf</B
></TT
> in
<TT
CLASS="userinput"
><B
>/proc/sys/net/ipv6/conf/eth0/autoconf</B
></TT
>
to <TT
CLASS="userinput"
><B
>1</B
></TT
>, MN will generate a new adress
combined with HA's prefix and it's own MAC address. I do not
think is it possible to avoid having this address generated.</DD
><DT
><A
HREF="testbed.html#staticadr"
><IMG
SRC="../images/callouts/2.gif"
HSPACE="0"
VSPACE="0"
BORDER="0"
ALT="(2)"></A
></DT
><DD
>Our original static IPv6 address</DD
><DT
><A
HREF="testbed.html#linkaddrs"
><IMG
SRC="../images/callouts/3.gif"
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