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I wanted to assign Unique Local Addresses (ULA) to a couple of machines inside my LAN alongside the link-local ones and the globally routable ones. I am currently running dual stack.
I also wanted to keep them short, like fd69:6666::.

One machine is running Debian Jessie (kernel 3.16.0-4-amd64) and the other one Linux Mint 17.2 (kernel 3.16.0-38-generic x86_64).

After following this guide: Set Up An IPv6 LAN with Linux.
I ended up with the following configuration:

/etc/network/interfaces:

allow-hotplug eth0 iface eth0 inet static address 192.168.1.100 netmask 255.255.255.0 broadcast 192.168.1.255 gateway 192.168.1.1 dns-nameservers 192.168.1.1 auto eth0 iface eth0 inet6 static address fd69:6666:: #fd69:7777:: on the other machine. netmask 64

/etc/radvd.conf:

interface eth0 { AdvSendAdvert on; prefix fd69:6666::/64 { #fd69:7777:: on the other machine. AdvOnLink on; AdvAutonomous on; }; }

Problem is that I end up having both machines with the fd69:6666 prefix and nothing else! IPv6 connectivity stops working. What am I doing wrong?

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1 Answer 1

Reset to default
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Try using fd69::6666 instead. Using fd69:6666:: only sets the network part of the address.
Remember to change the netmask too!
This should be the result:

/etc/network/interfaces 

auto eth0 iface eth0 inet6 static address fd69::6666 netmask 64
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  • Remarkably enough, radvd is not really needed. Perhaps because i didn't add the autoconf 0 clause? Commented Nov 13, 2015 at 15:52
  • The Debian machine now lost its global IPv6 address. How can this be? Commented Nov 13, 2015 at 16:11
  • I would stick to 64 bit netmask. Commented Nov 13, 2015 at 16:13
  • Why? Is it related to the debian machine losing its global address? Commented Nov 13, 2015 at 16:18
  • For some reason now echo 1 > /proc/sys/net/ipv6/conf/eth0/autoconf is needed (plus waiting a few minutes). Add to sysctl.conf as needed. Commented Nov 13, 2015 at 16:52

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