Salut,
il serait temps qu'il y ait une norme au niveau du dhcp-pd, on ne sait jamais trop quel comportement on va avoir venant de la box et des parefeu désactivés sur les préfixes délégués.Si on veut que l'usage d'ipv6 se développe, il va falloir normaliser tout ça.

In principle, DHCP allows a client to request new prefixes to be delegated by sending additional IA_PD options (see Section 21.21). However, a typical operator usually prefers to delegate a single, larger prefix.
In most deployments, it is recommended that the client request a larger prefix in its initial transmissions rather than request additional prefixes later on. The exact behavior of the server (whether to grant
additional addresses and prefixes or not) is up to the server policy and is out of scope for this document.

[RFC 9915] page 19

An IA_PD is different from an IA for address assignment in that it does not need to be associated with exactly one interface. One IA_PD can be associated with the client, with a set of interfaces, or with exactly
one interface. A client configured to request delegated prefixes must create at least one distinct IA_PD. It may associate a distinct IA_PD with each of its downstream network interfaces and use that IA_PD to
obtain a prefix for that interface from the server.

[RFC 9915] page 31

If the client has included IA Prefix options (see Section 21.22), the server MAY use the prefix contained in the "IPv6-prefix" field and/or the prefix length contained in the "prefix-length" field as hints about the
prefixes the client would like to receive. If the server is not going to assign an address or delegated prefix received as a hint in the Solicit message, the server MUST NOT include this address or delegated
prefix in the Advertise message.

[RFC 9915] page 66