Re: iptables: "stateful inspection?"

["Michael H. Warfield" <mhw@wittsend.com>]

Hello all!

On Wed, Dec 20, 2000 at 01:08:07PM -0500, Michael H. Warfield wrote:
> On Wed, Dec 20, 2000 at 12:52:27PM -0500, Michael Rothwell wrote:
> > "Michael H. Warfield" wrote:

> > >         You can use spf to add some stateful inspection for PORT mode
> > > ftp.  Personally, I like the masquerading option better, though.

> > Can you give an example of using MASQ selectively? I have real addresses
> > on both sides of the firewall, but want things like FTP to work
> > correctly. I think the IPChains HOWTOs are just a little terse. :)

	Michael Rothwell kindly pointed out to me in private mail that
I SCREWED UP (he didn't say that, I did) the copy-and-past on one of
the command lines and left out a "little detail"...

> 	modprobe ip_masq_ftp
> 	ipchains -A forward -p tcp -s {Source Addresses} -d 0/0 21

	This should have been:

	modprobe ip_masq_ftp
	ipchains -A forward -p tcp -s {Source Addresses} -d 0/0 21 -j MASQ

	DOH!  Sorry!

> 	Seems to work for me (mine includes a "tag" and a policy route
> rule to send it out my cable modem that I've left off here)...

> 	If you don't load the ip_masq_ftp module, you WILL get illegal
> port errors on the PORT commands.

> > Thanks!

	Mike
-- 
 Michael H. Warfield    |  (770) 985-6132   |  mhw@WittsEnd.com
  (The Mad Wizard)      |  (678) 463-0932   |  http://www.wittsend.com/mhw/
  NIC whois:  MHW9      |  An optimist believes we live in the best of all
 PGP Key: 0xDF1DD471    |  possible worlds.  A pessimist is sure of it!

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