All of lore.kernel.org
 help / color / mirror / Atom feed
From: <hamals@infinito.it>
To: netfilter@lists.netfilter.org
Cc: franco.riggi@tiscali.it
Subject: bad tcp packets
Date: Tue, 23 Nov 2004 13:18:25 +0100	[thread overview]
Message-ID: <web-23112413@infinito.it> (raw)


Hello to everyone

I'm reading "Iptables Tutorial 1.1.19" by Oskar 
Andreasoon, and I cant understand these bad packets rules


$IPTABLES -N bad_tcp_packets
#
#
# bad_tcp_packets chain
#
$IPTABLES -A bad_tcp_packets -p tcp --tcp-flags SYN,ACK 
SYN,ACK \
-m state --state NEW -j REJECT --reject-with tcp-reset
$IPTABLES -A bad_tcp_packets -p tcp ! --syn -m state 
--state NEW -j LOG \
--log-prefix "New not syn:"
$IPTABLES -A bad_tcp_packets -p tcp ! --syn -m state 
--state NEW -j DROP

someone could explain me why that are bad tcp packets?

Thanks

_______________________________________
Connessione ed e-mail gratuita da 10 mb
consultabile tramite web e tramite pop.
www.infinito.it vieni a scoprire tutti 
i nostri servizi!

http://www.infinito.it/xmail



             reply	other threads:[~2004-11-23 12:18 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-11-23 12:18 hamals [this message]
2004-11-23 12:42 ` bad tcp packets Miguel Angel Amador L
2004-11-23 13:49 ` Jason Opperisano
2004-11-23 13:59 ` Frank Gruellich
  -- strict thread matches above, loose matches on Subject: below --
2004-11-23 13:39 Scott Knake

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=web-23112413@infinito.it \
    --to=hamals@infinito.it \
    --cc=franco.riggi@tiscali.it \
    --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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.