Hi, I am a fairly newbie to Linux, so I was not sure whether to post this question in this or the Newbie forum. Decided on networking as this is networking related.

I am currently running an application on a specific release of Ubuntu Server - 12.04.2 (lsb_release -a shows 'Prercise'). The hardware server has 2 x on-board dual-port NICs.

The interfaces are configured with IPv4. I need to configure IPv6 addressing on one port only, the application will be extended to support IPv4 and IPv6.

I have sussed out how to manually add an IPv6 address to the interface. If I use ifconfig, or just ip commands I can list the interface and see the IPv6 I have added to it (of course the IPv6 is a global scope IP).

However I try to add this to the /etc/network/interfaces file, but on restart the interface is not configured with the IPv6 address, just with the IPv4 as usual. My search on the net brings up information and I know I add the IPv6 manually correctly, and it seems I have edited the interfaces correctly, but still I do not get the IPv6 auto configured on the interface.

For what it is worth:

- IPv6 address (just an example) 2a03:dd00:801:f803::101
- Interface on which this is required (example): eth2


So for example, in my interfaces file I have the following stanza for device eth2 (I have used dummy IPs for illustration purposes:

auto eth2
iface eth2 inet static
address 1.1.1.1
netmask 255.255.255.255
network 111.111.111.0
gateway 111.111.111.1
iface eth2 inet6 static
address 2a03:dd00:801:f803::101
netmask 64


As I say on restart, e.g. server reboot, my eth2 only show its IPv4 address, no IPv6. I can add the IPv6 manually again.

Am I missing something? Have I done something wrong?

IPv6 traffic works on the interface, once configured manually, so I know IPv6 is working.

Many thanks but apologies in advance if, as a newbie to networking in Linux, I have omitted something (not understood something).

Bohdan

Wonder if it needs a gateway also? Shouldn't but maybe.

"gateway 2607:f0d0:2001:000a:0000:0000:0000:0001"


https://www.cyberciti.biz/faq/ubuntu...configuration/

Guess it would also assume up to date system and maybe a nic driver that supports ipv6.

This is resolved. Not entirely sure how, but I had to make other changes to the 'interfaces' file - this had three interfaces defined, but all three had a GW defined, each interface being on a different subnet.

To solve that problem I left my default route on my interface eth0, then added 'up route add ...' lines to the stanzas for interfaces eth1 and eth2, adding specific routes. When I restarted the services, I solved my default route issue but also my IPv6 address is configured on the interface, as expected - incidentally the IPv6 address was configured in interface eth2.

So, the issue is resolved, seems to have resolved itself.