Setting up IPv6 on Linux is pretty trivial, you can follow IPv4 guidelines and give yourself a static IPv6 address.
On Solaris things are not so rosy, IPv6 only works after running
in.ripng. After running this you get IPv6 address auto-configuration on the local LAN segment. So whilst I have configured Solaris for one static IPv6 address I ultimately end up with three, the link-local scope, the static global-scope and a auto-configured global-scope:
lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1 inet 127.0.0.1 netmask ff000000 eri0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2 inet 10.6.28.36 netmask ffffff00 broadcast 10.6.28.255 lo0: flags=2002000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv6,VIRTUAL> mtu 8252 index 1 inet6 ::1/128 eri0: flags=2100841<UP,RUNNING,MULTICAST,ROUTER,IPv6> mtu 1500 index 2 inet6 fe80::203:baff:fe4e:6cc8/10 eri0:1: flags=2100841<UP,RUNNING,MULTICAST,ROUTER,IPv6> mtu 1500 index 2 inet6 2002:dce8:d28e::36/64 eri0:2: flags=2180841<UP,RUNNING,MULTICAST,ADDRCONF,ROUTER,IPv6> mtu 1500 index 2 inet6 2002:dce8:d28e:0:203:baff:fe4e:6cc8/64
eri0:1 is the static address I have trivially chosen to match the IPv4 host,
eri0:2 shows the auto-configured address re-using the numbers from the link-local interface.
in.ripng is configured with
ifdefault AdvSendAdvertisements true prefixdefault AdvOnLinkFlag on AdvAutonomousFlag on if eri0 AdvSendAdvertisements 1 prefix 2002:dce8:d28e::/64 eri0
So the auto-configuration extends to all other hosts on the LAN segment so a Linux server with previously only the one global-scope address now yields two:
eth0 Link encap:Ethernet HWaddr 00:14:5e:bd:6d:da inet addr:10.6.28.31 Bcast:10.6.28.255 Mask:255.255.255.0 inet6 addr: 2002:dce8:d28e:0:214:5eff:febd:6dda/64 Scope:Global inet6 addr: fe80::214:5eff:febd:6dda/64 Scope:Link inet6 addr: 2002:dce8:d28e::31/64 Scope:Global UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Are these sane configurations?
It seems unrealistic to have Internet facing servers that take addresses from their MAC address.
From a development perspective for a networking stack I would like to bind to
eth0 with IPv6 and whilst it is simple to ignore the link-local scope interface how I can I select between the two global-scope addresses?
It's difficult to apply RFC 3484 sorting rules as both have the same scope and prefix length.
edit: side note for Solaris admins, after reviewing the system configuration I actually now can get static addressing to work correctly without auto-configuration.