Forum - Assigning hosts static IPv6 addresses within radvd :: SixXS

Assigning hosts static IPv6 addresses within radvd

Shadow Hawkins on Tuesday, 26 January 2010 14:21:30

Hi, From what I can see, radvd gives IPv6 address to to users on the local network in my setup, however is it possible to assign specific hosts/mac-addresses, specific IPv6 address (similar to the way you can do this with dhcp3-server)? Thank you...

Assigning hosts static IPv6 addresses within radvd

Shadow Hawkins on Tuesday, 26 January 2010 16:05:51

radvd is used for stateless autoconfiguration. What you're looking for is DHCPv6.

Assigning hosts static IPv6 addresses within radvd

Shadow Hawkins on Tuesday, 26 January 2010 23:42:36

While you cannot "reserve" addresses with RA you can generally expect for the clients to always autoconfigure the same address because they construct their address from the RA prefix and a rearrangement of their MAC address. (It's a little more complex than that, but the each MAC produces one unique host address.) However, clients may employ a privacy feature to avoid the effectively static address and periodically change addresses. Windows Vista and Windows 7 clients do this by default. Check this setting with

netsh interface ipv6 show privacy

and disable it with

netsh interface ipv6 set privacy state=disabled

if you want a consistent autoconfigured address for that host. The linux clients I've seen have privacy disabled by default.

Assigning hosts static IPv6 addresses within radvd

Shadow Hawkins on Wednesday, 27 January 2010 00:37:19

I didn't know about that set privacy command, I was using

netsh interface ipv6 set global randomizeidentifiers=disabled

which seems to have the same effect.

Assigning hosts static IPv6 addresses within radvd

Shadow Hawkins on Saturday, 20 November 2010 22:28:43

Linux can do that, too, but compared to Windows doesn't do it by default. You need

CONFIG_IPV6_PRIVACY=y

and then

sysctl -w net.ipv6.conf.all.use_tempaddr=1

(or

echo net.ipv6.conf.all.use_tempaddr=1 >> /etc/sysctl.conf

to make it persistent.)

Assigning hosts static IPv6 addresses within radvd

Shadow Hawkins on Sunday, 21 November 2010 12:47:40

On my machines ipv6 isn't available at the time sysctl.conf is processed, so I had to do it in /etc/network/interfaces iface eth0 inet6 static pre-up modprobe ipv6 pre-up sysctl -w net.ipv6.conf.all.autoconf=0 pre-up sysctl -w net.ipv6.conf.eth0.autoconf=0 address 2001:xxxx:xxxx::8 netmask 64 up ip -6 route add 2000::/3 via 2001:xxxx:xxxx::1

Assigning hosts static IPv6 addresses within radvd

Jeroen Massar SixXS Staff

on Sunday, 21 November 2010 12:59:59

Put 'ipv6' in /etc/modules and rebuild your initial ramdisk and you should be fine. Of course, just compiling IPv6 into the kernel is another alternative ;)

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