Tunnel Configuration Examples
ExtremeWare XOS 11.3 Concepts Guide
525
6in4 Tunnel Configuration Example
Figure 64 illustrates a 6in4 tunnel configured between two IPv6 regions across an IPv4 region.
Figure 64: 6in4 Tunnel Example
In Figure 64, Router A has an interface to an IPv4 region with the address 192.168.1.1 (for this example
we are using private IPv4 addresses, but to tunnel across the Internet, you would use a public address).
Router B has an IPv4 interface of 10.2.0.1. The IPv4 interface must be created before the tunnel is
configured and cannot be deleted until the tunnel is deleted.
This example has one subnet in each IPv6 region, 2001:db8:1::/64 for Router A and 2001:db8:2::/64 for
Router B. Hosts A and B are configured to use IPv6 addresses 2001:db8:1::101 and 2001:db8:2::101
respectively.
In order for traffic to move from one region to the other, there must be a route. In this example, a static
route is created, but you could enable RIPng or OSPFv3 on the tunnel interface.
In this example, we assume that the IPv4 network can route from Router A to Router B (in other words,
some IPv4 routing protocol is running on the public-ipv4 interfaces). However, you do not need to
enable IPv4 forwarding on the public interfaces in this example unless you are also routing IPv4 traffic
on them (in this example, it is assumed you are running no IPv4 traffic inside your respective IPv6
networks, although you could).
IPv6
IPv4
EX_108
Router B
Host B
2001:db8:a::2/64
10.2.0.1/24
2001:db8:2::1/64
Router A
2001:db8:a::1/64
192.168.1.1/24
IPv6
2001:db8:2::101/64
Host A
2001:db8:1::101/64
2
2
1
1
2001:db8:1::1/64
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