Re: Linksys Router and PASV FTP
From: Jim Nugent (nuge_at_execpc.invalid)
Date: 02/09/04
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Date: Mon, 09 Feb 2004 02:30:45 GMT
"Richard" <richard@nospam.no> wrote in message
news:oAwVb.251$72.179820032@news.telia.no...
> Your router really can't be blamed, it does just that, route traffic, it
> does'nt care what you let through it...
> Some firewalls on the other hand does'nt handle FTP well, unless PASV mode
> is used.
In the normal FTP protocol the remote host sends back a port number and
says, listen on this port for the data. That doesn't work so well with most
firewalls, so that's exactly what PASV (passive) mode is for. All
connections are handled from the client end. It's been around since the days
of the SOCKS proxy, and most FTP clients support it.
I suppose an FTP client could use UPNP to set up the router to open the
appropriate port, but it's easier to use PASV because it's already there.
-- Jim (for e-mail replace invalid with net) "Remember, an amateur built the Ark; professionals built the Titanic."
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