1 [[!meta title="setting up an IPv6 network managed by tinc"]]
3 ## Example: IPv6 Networking
5 Michael Adams, 8-27-2007
6 http://www.wolfsheep.com/
10 This document is to highlight an example setup for using tinc to create an IPv6 network.
14 [[!img examples/fig-ipv6-network.png link=examples/fig-ipv6-network.dia]]
15 *Click on the image for the original [DIA](http://en.wikipedia.org/wiki/Dia_(software)) file.*
17 ### Scenario Parameters
19 1. IPv6 is provided via a native or tunnel-brokered service at a main site. If you need a tunnel, refer to Wikipedia's list of IPv6 tunnel brokers.
20 2. The IPv6 allocation given is 2001:db8:beef::/48, using a tunnel from 2001:db8:dead:beef::1 to 2001:db8:dead:beef::2.
21 3. All the tinc connections share a subnet of 2001:db8:beef:0::/64, and their addresses are tied to 2001:db8:beef:(subnet #)::/64 allocations. For example, "routerc" will listen on tinc at 2001:db8:beef::3, will have a LAN address of 2001:db8:beef:3::1, and a subnet of 2001:db8:beef:3::/64.
22 4. All the routers and servers using tinc connect over the IPv4 Internet, using WAN addresses based on 192.0.2.0/24. "routerc" uses 192.0.2.3.
23 5. "routera" is a Linux server that manages the #1 subnet, and makes the connection to the IPv6 Internet.
24 6. All other routers are assumed to be Linux based for their TUN/TAP support of bridged-Ethernet.
26 ### Configuration Files
28 1. On Debian/Ubuntu systems, an entry in "/etc/network/interfaces" can be used to statically assign the ::1 address for the local LAN. Example:
29 > iface eth1 inet6 static
30 > address 2001:db8:beef::1::1
33 On non Debian/Ubuntu systems, a line can be put in a boot script, such as "ip -6 addr add 2001:db8:beef:1::1/64 dev eth1".
35 2. IPv6 forwarding needs to be enabled: put "echo "1" >/proc/sys/net/ipv6/conf/all/forwarding" in a boot script, or "net.ipv6.conf.all.forwarding = 1" in "/etc/sysctl.conf".
37 3. This setup uses tinc's "switch" mode: subnets are not assigned in the host files; only Address (for ConnectTo targets only) and the key are required in host files.
39 4. It is assumed that the config files go into something like "/etc/tinc/link" and "/etc/tinc/nets.boot" has an entry for "link". The following table can be used to guide configuration of routers:
40 * "routera" configuration for tinc (the master router):
53 > ip -6 link set vpn6 up mtu 1280 txqueuelen 1000
54 > ip -6 addr add 2001:db8:beef::1/64 dev vpn6
55 > ip -6 route add 2001:db8:beef::/48 dev vpn6
56 > #Static routing table
57 > ip -6 route add 2001:db8:beef:2::/64 via 2001:db8:beef::2
58 > ip -6 route add 2001:db8:beef:3::/64 via 2001:db8:beef::3
59 > ip -6 route add 2001:db8:beef:4::/64 via 2001:db8:beef::4
63 > #Static routing table
64 > ip -6 route del 2001:db8:beef:2::/64 via 2001:db8:beef:::2
65 > ip -6 route del 2001:db8:beef:3::/64 via 2001:db8:beef:::3
66 > ip -6 route del 2001:db8:beef:4::/64 via 2001:db8:beef:::4
68 > ip -6 route del 2001:db8:beef::/48 dev vpn6
69 > ip -6 addr del 2001:db8:beef::1/64 dev vpn6
70 > ip -6 link set vpn6 down
72 * "routerb" configuration for tinc (the other non-master routers will be like this one):
85 > ip -6 link set vpn6 up mtu 1280
86 > ip -6 addr add 2001:db8:beef::2/64 dev vpn6
87 > ip -6 route add default via 2001:db8:beef::1
91 > ip -6 route del default via 2001:db8:beef::1
92 > ip -6 addr del 2001:db8:beef::2/64 dev vpn6
93 > ip -6 link set vpn6 down
95 5. You can use [radvd](http://www.litech.org/radvd/) or [Quagga](http://www.quagga.net/) to perform [stateless address autoconfiguration](http://www.ietf.org/rfc/rfc2462.txt) on your LAN. This is an example zebra.conf for LAN autoconfiguration (don't forget to enable the zebra daemon):
99 > no ipv6 nd suppress-ra
100 > ipv6 address 2001:db8:beef:1::1/64
101 > ipv6 nd prefix 2001:db8:beef:1::/64
102 > ipv6 nd ra-interval 10