Transparent ftp-proxy

Hi,

i'm trying to get a working transparent ftp-proxy using 1.9.2.4.

I use the following setup:
1) Notebook with default gateway pointing to my linux box
2) linux box with suse-proxy-suite and iptables using port redirect from 
21 to 2021
3) FTP-Virusscanner for security (requires user@site to work)
4) Internet :)

The ftp-proxy is configured to listen on 2021 and perform transparent 
proxying. I have also added a destinationaddress pointing to my 
virusscanner. All connections should be relayed via the virusscanner.
The linux box also does not have a default route as there is no need 
for it.

When running the ftp-proxy in non transparent mode and logging on 
with user@host everything works fine and the virusscanner also gets 
involved. When I change to transparent proxying I get the following 
error:
TECH-ERR: Srv-Ctrl: can't connect <<destination>> for <<source>>

As soon as I add a default route the connection works, but the 
connection is established directly with the remote host, and the 
virusscanner is not included in the session.

Did I miss something or does the combination transparent proxy and 
rerouting via the Virusscanner not work?

thanks and regards
Christoph

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