From: SBlaze <dagent.geo@yahoo.com>
To: Jorge Garcia <anarkophobia@latinmail.com>, netfilter@lists.netfilter.org
Subject: Re: port scanning
Date: Thu, 18 Mar 2004 16:15:20 -0800 (PST) [thread overview]
Message-ID: <20040319001520.73563.qmail@web61008.mail.yahoo.com> (raw)
In-Reply-To: <20040318224754.5502418D76@smtp.latinmail.com>
--- Jorge Garcia <anarkophobia@latinmail.com> wrote:
> hi, i need an example of script ( please, i need the example works, becuouse
> i found a lot on internet that doesnt work) for logging and dropping port
> scans with iptables.
> thanx
>
> http://www.latinmail.com - La forma más cómoda de enviar y recibir tus
e-mails
This is what I use and it works very well. You will need to allow services(if
you have any that is.) Those rules must be placed before these lines. Also of
course you must have the device reflect your internet device.
# NMAP and Connection killer
#
# iptables -A INPUT -p tcp -i eth0 -m state --state NEW -j LOG
iptables -A INPUT -p tcp -i eth0 -m state --state NEW,INVALID -j DROP
iptables -A INPUT -p tcp -i eth0 -m state --state ESTABLISHED,RELATED -j
ACCEPT
# UDP Filters
#
#iptables -A INPUT -p udp -i eth0 -m state --state NEW,INVALID -j LOG
iptables -A INPUT -p udp -i eth0 -m state --state NEW,INVALID -j DROP
iptables -A INPUT -p udp -i eth0 -m state --state ESTABLISHED,RELATED -j
ACCEPT
# ICMP Filtration
#
iptables -A INPUT -p icmp -i eth0 -m state --state NEW,INVALID -j DROP
iptables -A INPUT -p icmp -i eth0 -m state --state ESTABLISHED,RELATED -j
ACCEPT
Proof that it works?
hogwarts:~# iptables -vnL
Chain INPUT (policy ACCEPT 789K packets, 166M bytes)
pkts bytes target prot opt in out source destination
15813 1383K LOG tcp -- eth0 * 0.0.0.0/0 0.0.0.0/0
tcp dpt:80 LOG flags 0 level 4
2137 128K DROP all -- eth0 * 12.175.0.35 0.0.0.0/0
0 0 ACCEPT all -- eth0 * 68.1.132.236 0.0.0.0/0
13676 1255K ACCEPT tcp -- eth0 * 0.0.0.0/0 0.0.0.0/0
tcp dpt:80
3727 208K DROP tcp -- eth0 * 0.0.0.0/0 0.0.0.0/0
state INVALID,NEW
2516 3759K ACCEPT tcp -- eth0 * 0.0.0.0/0 0.0.0.0/0
state RELATED,ESTABLISHED
27M 3361M DROP udp -- eth0 * 0.0.0.0/0 0.0.0.0/0
state INVALID,NEW
1543 227K ACCEPT udp -- eth0 * 0.0.0.0/0 0.0.0.0/0
state RELATED,ESTABLISHED
1697 1426K DROP icmp -- eth0 * 0.0.0.0/0 0.0.0.0/0
state INVALID,NEW
133 7448 ACCEPT icmp -- eth0 * 0.0.0.0/0 0.0.0.0/0
state RELATED,ESTABLISHED
Chain FORWARD (policy ACCEPT 11M packets, 3359M bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 1452K packets, 1121M bytes)
pkts bytes target prot opt in out source destination
=====
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prev parent reply other threads:[~2004-03-19 0:15 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-18 22:47 port scanning Jorge Garcia
2004-03-18 23:02 ` Frederic de Villamil
2004-03-19 0:15 ` SBlaze [this message]
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