Re: [ipv6] valid_lft and active connections

Hello.

Stefan (metze) Metzmacher wrote:

If I use ipv6 addresses with valid_lft != forever, the ipv6 addresses
are removed from the interface if the valid_lft expires, even if there're
established connection which use with address.

Would it be possible keep the address until the last active connection
is closed? Otherwise the usable of the privacy extensions will make
very long living tcp connections impossible.

I cannot imagine why you do not hear RAs before the address expires.

And well, I don't think it is a good idea because it is not what
"valid lifetime" means.

We have 3 states:

1) time <= preferred lifetime
2) preferred lifetime < time <= valid lifetime
3) valid lifetime < lifetime

You can make new connection during the period of 1 and you can continue
using that connection during the period of 1 and 2.

Ask network administrator to advertise longer "valid" lifetime, if
needed, and you may want to make net.ipv6.conf.*.max_addresses larger.

It would be also ok to add a new special value "used" similar to "forever",
which triggers the modified behavior.

???

--yoshfuji