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(usagi-users 02264) Why put the scoped address in the FTP EPRT command?



I've noticed that both Win XP's and Linux's FTP client put scoped addresses in the EPRT command.
Is there a real need for that? Does the other side (the server) care about which interface the client is using?
I've seen it in XP all the time, and in Linux only if I connect using link-local or within a SIT tunnel interface.
(Not sure it is stricly USAGI relevant, but USAGI does supply a FTP client)
TIA,
Y.