I have a question (or two) about the issue relating to ftp traffic through a
Linux ipchains firewall.
I've noticed that Windoze clients have problems with ftping through an
with the return traffic from a target ftp server. i.e Windoze connects to
an ftp server just fine,
but the return traffic doesn't get back to the client. I've researched this
problem on the net,
and have seen reference to ip_masq_ftp.
I've also noticed that at least Linux clients (maybe others) don't suffer
My first question is about why the Windoze clients have this trouble - why
is that? What does
the Windoze ftp client do differently than a Linux ftp client?
Secondly, after searching for ip_masq_ftp, I've come up with nothing. It's
not on my system anywhere.
I do however see a module called ip_nat_ftp, but when I try to load it in my
firewall script with
"modprobe ip_nat_ftp" I get the following errors:
Device or resource busy
Hint: insmod errors can be caused by incorrect module parameters, including
invalid IO or IRQ parameters
What is wrong with the "modprobe ip_nat_ftp" command?
ip_masq_ftp seems to be an ipchains module - and not for iptables. Is this
correct? If so, must I now
employ iptables (and different modules) to fix the Windoze ftp problem?
Thanks for any help!
Regards - and Happy Holidays!