Re: [PATCH 2/4] lwip: clean up IPv6 address handling in init_ifs and inquire_device

El 28/6/26 a les 15:23, Roy Marples ha escrit:
>   > 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.

I set it to /128 because that's how I understood this comment:

https://cgit.git.savannah.gnu.org/cgit/lwip.git/tree/src/core/ipv6/nd6.c#n1678

However it's true that in fact lwip only supports 64 bit prefixes.

If it receives and RA with a prefix other than 64, it drops it:

https://cgit.git.savannah.gnu.org/cgit/lwip.git/tree/src/core/ipv6/nd6.c#n213

I think we can assume the prefix will always be 64. I reverted this 
change. I'm gonna send the updated patches now