>> yah, but there are faulty DNS servers caches result longer than
>> it should. if we accept the connection, we will use deprecated
>> address for longer period of time, and we end up cannot
>> terminate
>> contract with ISP-OLD.
>If the DNS cache is faulty, it might not have the new address in it. So if
>you fail the connect to the old address, you won't get any connection at
>all.
oops, we are talking about different thing. you are talking about
default behavior, where we allow packets with deprecated address
to be generated. I was talking about non-default behavior where
deprecated address is forbidden. sorry for confusion and not being
clear enough.
itojun
---
5.5.4. Address Lifetime Expiry
A preferred address becomes deprecated when its preferred lifetime
expires. A deprecated address SHOULD continue to be used as a source
address in existing communications, but SHOULD NOT be used in new
communications if an alternate (non-deprecated) address is available
and has sufficient scope. IP and higher layers (e.g., TCP, UDP) MUST
continue to accept datagrams destined to a deprecated address since a
deprecated address is still a valid address for the interface. An <---
implementation MAY prevent any new communication from using a <---
deprecated address, but system management MUST have the ability to <---
disable such a facility, and the facility MUST be disabled by <---
default.
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