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From: "Frédéric Massot" <frederic@juliana-multimedia.com>
To: lartc@vger.kernel.org
Subject: [LARTC] Mark on FTP passive traffic
Date: Fri, 09 Mar 2007 15:21:02 +0000	[thread overview]
Message-ID: <esru10$6q9$1@sea.gmane.org> (raw)

Hi,

I use for a customer a Linux router/firewall with 1 internal interface 
connected to the LAN and 3 external interfaces connected to 3 different 
ISP. I use a kernel 2.6.17 with a routes patch from Julian Anastasov.

I mark outgoing FTP traffic for the routing.

With the rules below I do not have a problem with the active/normal FTP 
to connect on FTP server.

But the passive FTP does not pass because I do not know how to mark the 
related packets whose ports are negotiated in FTP session.

I quote only the rules for the internal interface and one of the 
external interfaces. The rules are the same ones for the three external 
interfaces.

# global rule for all traffic
iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT

# FTP rule
iptables -A FORWARD -i $INTERNAL_INTERFACE -o $EXTERNAL_INTERFACE1 -p 
tcp -s $INTERNAL_LAN --sport $UNPRIVPORTS --dport 21 -m state --state 
NEW -j ACCEPT

iptables -A OUTPUT -o $EXTERNAL_INTERFACE1 -p tcp -s $EXTERNAL_IP1 
--sport $UNPRIVPORTS --dport 21 -m state --state NEW -j ACCEPT


# FTP mark
iptables -t mangle -A FORWARD -o $EXTERNAL_INTERFACE1 -p tcp --dport 21 
-j MARK --set-mark 0x21
iptables -t mangle -A OUTPUT -o $EXTERNAL_INTERFACE1 -p tcp --dport 21 
-j MARK --set-mark 0x21
iptables -t mangle -A PREROUTING -i $INTERNAL_INTERFACE -p tcp --dport 
21 -j MARK --set-mark 0x21

iptables -t mangle -A FORWARD -o $EXTERNAL_INTERFACE1 -p tcp --dport 20 
-j MARK --set-mark 0x21
iptables -t mangle -A OUTPUT -o $EXTERNAL_INTERFACE1 -p tcp --dport 20 
-j MARK --set-mark 0x21
iptables -t mangle -A PREROUTING -i $INTERNAL_INTERFACE -p tcp --dport 
20 -j MARK --set-mark 0x21


Do you know how I can mark the related packets to the passive FTP?

Regards.
-- 
=======================
|              FRÉDÉRIC MASSOT               |
|     http://www.juliana-multimedia.com      |
|   mailto:frederic@juliana-multimedia.com   |
=============Þbian=GNU/Linux=
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             reply	other threads:[~2007-03-09 15:21 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-03-09 15:21 Frédéric Massot [this message]
2007-03-10  5:00 ` [LARTC] Mark on FTP passive traffic Rodolfo Brasnarof

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