Is ip_conntrack_ftp needed for 1:1 nat?

[Pascal Hambourg]

Robert LeBlanc a écrit :
> the FTP protocol contains the source IP and port,

The _destination_ address and port.

> which wouldn't
> make sense since it is a private address. At least that is what I
> understand of the FTP protocol.
> 
> Are there any other protocols that have issues like this that I'm not
> aware of?

You can have an idea by looking at the available conntrack/NAT helper 
modules (ip_conntrack_* and ip_nat_*) for the Linux kernel : IRC DCC 
(file transfer and peer to peer communication with an IRC client), TFTP, 
PPTP, some communication/multimedia/peer to peer protocols such as 
H.323/Netmeeting, RTSP, SIP, MSN Messenger, DirectX, MMS (Microsoft 
Streaming Media), Talk...