On Tue, 2002-10-15 at 06:50, Juan Luis Baptiste wrote:
> Hi,
>
> I'm working in a IPv4/IPv6 translator, now I'm doing an FTP
> ALG, and I need to set up some
> machines to test it, but I don't know to make the the ftp
> server and client issue EPRT/PORT commands. I think I need
> to
> have something like a firewall between them right? because
> with the setup:
>
> ipv4 machine ----traslator------ipv6 machine
>
> if I ftp from the ipv4 machine to the ipv6 machine,
> EPRT/PORT commands are never used.
This is well documented in good old RFC959. PORT commands are optional,
if the FTP client does not issue a PORT command, the default FTP
dataport is used by the server when opening the data connection down to
the client. This behaviour can usually be toggled in the FTP client,
usually with the command "sendport" or similar ("sendport" is the
command used in the FreeBSD FTP client to toggle the use of PORT
commands).
Also note that if you have enabled passive mode FTP, PORT commands are
never used, as the client will issue a PASV instead of PORT to open a
data connection.
For LPRT/LPSV, see RFC1639. EPRT/EPSV, see RFC2428.
/leg
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