Linux Netfilter discussions
 help / color / mirror / Atom feed
From: Vultur Constantin <costi@cdvultur.com>
To: netfilter@lists.netfilter.org
Subject: One little problem I don't understand
Date: Wed, 09 Aug 2006 23:14:39 +0300	[thread overview]
Message-ID: <44DA422F.7000306@cdvultur.com> (raw)

Hi,

I have a little problem understanding the way iptables does the matching 
of packets.
The problem is like this:
I have an subnet A.B.C.D/X which I mark it with --set-mark 1:

$IPT -A fw-interfaces -i $INT_IF -s $INT_NET  -d A.B.C.D/X -m state 
--state NEW    -j ACCEPT
$IPT -t mangle -A PREROUTING -i $INT_IF -d A.B.C.D/X  -j MARK --set-mark 1

and I mark the connections to port 22 ( ssh ) with --set-mark 2

$IPT -A fw-interfaces -i $INT_IF -s $INT_NET  -p tcp --dport 22 -m state 
--state NEW    -j ACCEPT
$IPT -t mangle -A PREROUTING -i $INT_IF -p tcp --dport 22 -j MARK 
--set-mark 2   
 
fw-interfaces is used as a custom chain in FORWARD.

Now my problem is like this:
If I want to connect to ssh to one of the ip's from d A.B.C.D/X all my 
packets are set-marked with 2. The rule with d A.B.C.D/X   is above tho 
one with ssh.
Shouldn't the ssh connection to A.B.C.D/X  be marked with 1 ? If not 
what I am doing wrong.

Thanks,

-- 
Constantin Daniel VULTUR



             reply	other threads:[~2006-08-09 20:14 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-08-09 20:14 Vultur Constantin [this message]
2006-08-10  7:35 ` One little problem I don't understand Martijn Lievaart
2006-08-10  7:55   ` Costi
2006-08-10  8:20     ` Rob Sterenborg
2006-08-10 12:13     ` Martijn Lievaart

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=44DA422F.7000306@cdvultur.com \
    --to=costi@cdvultur.com \
    --cc=netfilter@lists.netfilter.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox