# DHCPv6 with persistent DELEGATION (ia-pd) or IP (ia-na)

## individual address (ia-na)

    vi /etc/dhclient.conf

    interface "xenbr0" {
        send dhcp6.client-id ;
        request;
    }

beware all you get with an ia-na persistent IP is a `/128`.
we are missing a route for a given prefix,
and eventually a default route.

## delegated prefix (ia-pd)

use a decent DHCP client to tell your ISP about your DUID

    vi /etc/dhclient.conf

    interface "xenbr0" {
        send dhcp6.client-id YOUR-DUID;
        #request;
    }

you can force a request for delegated prefix with `dhclient -P`

we are eventually missing a default route.

## shared

you can obtain dns settings from DHCPv6 however no gateway

therefore, we still need to [get RAs](slaac.html) (without the need of the actual SLAAC allocation)