From: Samuel Thibault <[email protected]> To: "Joan Lledó"<[email protected]> Cc: <[email protected]>, <[email protected]>, <[email protected]>, "Joan Lledó"<[email protected]> Date: Sat, 27 Jun 2026 23:15:01 +0100 Subject: Re: [PATCH 2/4] lwip: clean up IPv6 address handling in init_ifs and inquire_device > > > - and set prefix_len based on whether the > > address is static (64) or autoconf (128) instead of always 64. > > ? > > Even autoconf addresses usually do have a non-128 prefix len, to be able > to reach neighbours.
I agree with Samuel. Please don't do this. Router Advertisements advertise a Prefix from which an address *may* be derived based on length (64) and flags (make an autoconf address). DHCPv6 addresses are always /128 because they are not directly tied to a Prefix. It is impossible to infer a Prefix Length from any address. Roy
