Ipv6

Debian GNU/Linux as IPv6 host

The network inferface must not be configured from /etc/network/interfaces (networking.service).

Instead prefer systemd-networkd:

[Match]
Name=eth0

[Network]
DHCP=yes
IPv6AcceptRA=yes

The option DHCP enable both DHCPv4 and DHCPv6.

Debian GNU/Linux as IPv6 Requesting Router

Our provider provides ::/48 block with a 00:03 (link-layer) DUID:

[Match]
Name=eth0

[Network]
DHCP=yes
IPv6AcceptRA=yes
IPv6Forwarding=yes

[DHCPv6]
DUIDRawData=00:01:23:45:67:89:0a:bc
DUIDType=link-layer
PrefixDelegationHint=::/48
WithoutRA=solicit

The bridge address must be configured:

[Match]
Name=xenbr0

[Network]
Address=172.16.0.1/16
DHCPPrefixDelegation=yes
IPv6Forwarding=yes
IPv6SendRA=yes

[DHCPPrefixDelegation]
SubnetID=1
Token=::1

[IPv6Prefix]
Prefix=2001:bc8:3807:1::/64

The DHCPPrefixDelegation section allows to configure the address of xenbr0 from the prefix obtained with the DUID (specified in ÌPv6Prefix` section):

• SubnetID completes the /64 of the network part
• Token sets a static /64 of the address part

The global IPv6 forwarding must be activated:

[Network]
IPv6Forwarding=yes

The status of an interface can be shown with:

networkctl status xenbr0

OpenBSD as IPv6 host

Edit the xfn0 interface for IPv6:

inet autoconf
inet6 autoconf -soii -temporary
up

to configure the inferface having a EUI-64 address.

Enable and start the SLAAC deamon:

rcctl enable slaacd
rcctl start slaacd