Disclaimer
This is not a full-fledged HOWTO. If you are new to IPv6
or if you need more details about why things work like
they do, please
apt-get install doc-linux-html
and look for the very comprehensive
Linux+IPv6-HOWTO.
|
The kernel
You will need to enable IPv6 support in the kernel, either
built in or as a module. Users of ready-made Debian
kernels should already have the module loaded. If it is
not, simply modprobe ipv6. Users of a custom kernel
will need to recompile. Once you have done it right,
ifconfig lo will show this line:
inet6 addr: ::1/128 Scope:Host
Welcome on board!
|
Configuring a static address
Let's start with something simple. You can permanently
configure a static address using the common scheme in
/etc/network/interfaces. This is how I do it on my
net:
iface eth0 inet6 static
address 3ffe:1234:5678:fffd::1
netmask 64
This way, a simple ifup eth0 will configure the
ipv6 address for your lan card. You will need to add these
lines after the existing iface eth0 inet static
stanza.
|
Configuring a 6in4 tunnel
Now something more fancy. You wil probably need a few of
these tunnels as the providers giving native IPv6 are very
few. First of all, don't even think of using ifconfig to
accomplish this. You will need to apt-get install
iproute. The iproute toolset is far more powerful and
moreover you will be able to name your tunnels, instead of
having those boring sit0, sit1... interfaces ;-).
auto Fabbione
iface Fabbione inet6 v4tunnel
address 3ffe:abcd:ef::a
netmask 64
endpoint 192.168.2.5
pre-up echo -n "Starting IPv6 tunnel to fabbione..."
up ip tunnel change Fabbione local 192.168.2.254 ttl 128
up echo " done."
down echo -n "Stopping IPv6 tunnel to fabbione..."
post-down echo " done."
|
Simple routing
If you have a single IPv6 connection, you can live with a
default route. You will define it in
/etc/network/interfaces, by simply adding a
gateway line to the interface definition:
iface eth0 inet6 static
address 3ffe:dead:beef::a
netmask 64
gateway 3ffe:dead:beef::9
This will result, more or less, in the following output
of the ip -6 route command:
3ffe:dead:beef::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440
fe80::/10 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440
ff00::/8 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440
default via 3ffe:dead:beef::9 dev eth0 metric 1 mtu 1500 advmss 1440
default dev eth0 proto kernel metric 256 mtu 1500 advmss 1440
unreachable default dev lo metric -1 error -101
Obviously, if your only IPv6 connection to the world is
via a 6in4 tunnel, the default route will be via the
tunnel interface.
|
|
Configuring the daemons
|
snmpd
This will assume that you have just installed snmpd, and
that you have the sample config file, instead of running
snmpconf. I have not experimented with anything
fancy, but a good read at man snmpd.conf will give
you all the details and more. First, you need to get snmpd
to listen to IPv6 by editing /etc/default/snmpd so
as to read:
SNMPDOPTS='-s -l /dev/null -P /var/run/snmpd.pid udp6:161'
Note about 2.6.x kernels: you need to explicitly
enable both ipv4 and ipv6, like this:
SNMPDOPTS='-s -l /dev/null -P /var/run/snmpd.pid udp6:161 udp:161'
Then you need to edit /etc/snmp/snmpd.conf to add a
few lines to support IPv6. Probably there's a better way,
but I've chosen not to eliminate the IPv4 configuration,
even though apparently with Linux it is not possible to
have separate configs. The IPv6 one will override the
other. Maybe USAGI will change this, in the future. I've
done this:
# sec.name source community
#com2sec paranoid default public
com2sec readonly default public
com2sec readwrite default private
com2sec6 readonly6 default public
com2sec6 readwrite6 default private
[...]
group MyROGroup6 v2c readonly6
group MyRWGroup6 v2c readwrite6
[...]
access MyROGroup6 "" any noauth exact all none none
access MyRWGroup6 "" any noauth exact all all none
Remember to set decent community names, this is just an
example. If everything is correct, you'll be able to query
your daemon in IPv6:
ik5pvx@penny:~ $ snmpwalk -v 2c -c public udp6:::1 sysname
SNMPv2-MIB::sysName.0 = STRING: penny
|
|
...more?
Contributions are welcome! Please drop yours on the
mailing list or contact ik5pvx on IRC.
|
Having
v6 with Debian for the first time