Forum - What Prefix to use for static IPv6? :: SixXS

What Prefix to use for static IPv6?

Shadow Hawkins on Sunday, 28 July 2013 12:18:02

On a pc with Ubuntu 12.04 I want to put a static IPv6 address. I use the Network Connections window (by clicking on the network icon op top of the screen) IPv6 settings tab:

Address: 2001:7b8:2ff:8469::211 Prefix: ?????? Gateway: 2001:7b8:2ff:8469::1

What to fill in for field Prefix ? (it seems to me that in Ubuntu 12.04 the file /etc/network/interfaces is not used for this purpose anymore)

What Prefix to use for static IPv6?

Jeroen Massar SixXS Staff

on Sunday, 28 July 2013 12:44:26

What to fill in for field Prefix ?

2001:7b8:2ff:8469::/64

(it seems to me that in Ubuntu 12.04 the file /etc/network/interfaces is not used for this purpose anymore)

It partially is and partially is not. If you put entries there they will take effect, but Network Manager will nullify them. I personally don't use Network Manager, but there are people who for mysterious reasons love it. For the interfaces file you can use:

iface eth0 inet6 static address 2001:7b8:2ff:8469::211 netmask 64 gateway 2001:7b8:2ff:8469::1

Next to an IPv4 variant of the line eg 'iface eth0 inet dhcp' or similar.

What Prefix to use for static IPv6?

Shadow Hawkins on Sunday, 28 July 2013 22:53:02

Jeroen Massar wrote:

What to fill in for field Prefix ? 2001:7b8:2ff:8469::/64

The field Prefix seems to accept only 2 digits. As soon as I fill in more than 2 digits, the field color turns to red.

What Prefix to use for static IPv6?

Jeroen Massar SixXS Staff

on Monday, 29 July 2013 04:56:14

Henk Oegema wrote:

The field Prefix seems to accept only 2 digits. As soon as I fill in more than 2 digits, the field color turns to red.

I can only assume they actually mean "Prefix Length" then, which would make sense, thus just fill in "64".

What Prefix to use for static IPv6?

Shadow Hawkins on Monday, 29 July 2013 09:03:47

Jeroen Massar wrote:

Henk Oegema wrote:

The field Prefix seems to accept only 2 digits. As soon as I fill in more than 2 digits, the field color turns to red.

I can only assume they actually mean "Prefix Length" then, which would make sense, thus just fill in "64".

You are correct Jeroen. It works. Thanks

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