>> recently it was found that knob = 1 is not a good idea as we have
>> protocols that use multiple TCP sessions - for instance, suppose you
>> are ftp server and TCP control connection attempt is sent to deprecated
>> address. with knob = 1 we accept it. then when we are to make active
>> TCP data connetion with EPRT (IPv6 PORT), we can't make it as we are
>> forbidden to make TCP connection with deprecated IPv6 address as the
>> source.
>
>Note that we are NOT forbidden, but just required valid reasons to do so
>(from the definition of 'SHOULD NOT' of RFC 2119). In your ftp scenario,
>you can (or should) use deprecated address to avoid service disruption.
>
>page 2 in RFC 2462:
>| when possible. A deprecated address should be used only by
>| applications that have been using it and would have difficulty
>| switching to another address without a service disruption.
this may be an implementation issue, but who should decide it?
in KAME case we have kernel code which forbids the use of deprecated
address as a source (bind(2)) and FTP daemon cannot override it for
data connecdtion.
itojun
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