On June 28, 2026 2:23:39 PM GMT+01:00, Roy Marples <[email protected]> wrote: >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 > > >
Agreed, it's definitely not a great idea to infer one. Thanks!
