Linux Netfilter discussions
 help / color / mirror / Atom feed
From: Michele Petrazzo - Unipex <michele.petrazzo@unipex.it>
To: Jan Engelhardt <jengelh@medozas.de>
Cc: netfilter@vger.kernel.org
Subject: Re: strange log on gateway inside []
Date: Thu, 29 Jul 2010 11:18:59 +0200	[thread overview]
Message-ID: <4C514783.2000603@unipex.it> (raw)
In-Reply-To: <alpine.LSU.2.01.1007291051570.10386@obet.zrqbmnf.qr>

Jan Engelhardt ha scritto:
>> My output chain:
>> *filter
>> :OUTPUT DROP [4831251:620928037]
>> -A OUTPUT -o lo -j ACCEPT
>> -A OUTPUT -m state --state NEW,RELATED,ESTABLISHED -j ACCEPT
>> -A OUTPUT -j LOG --log-prefix "Firewall DROPOUT- "
>
> So what's left is INVALID packets.
>

First, thanks.
Seem that a rule that drop the INVALID packets to the trick. But... drop 
or reject the invalid packets?

>> The question. Why I see this log and why my fw want to talk with external and,
>> the last, why the kernel double log talk and one is inside the brackets  [ ] ?
>
> Because those are the contents of the ICMP packet. See the RFC.

Append also with tcp, no only icmp.
P.s. Have you a rfc number?

And the last, have you also an rfc that explain why and where invalid 
come from?

Thanks

  reply	other threads:[~2010-07-29  9:18 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-07-29  8:38 strange log on gateway inside [] Michele Petrazzo - Unipex
2010-07-29  8:52 ` Jan Engelhardt
2010-07-29  9:18   ` Michele Petrazzo - Unipex [this message]
2010-07-29  9:49     ` Jan Engelhardt
2010-07-29  9:20 ` Pascal Hambourg
2010-07-30 10:41 ` Michele Petrazzo - Unipex
2010-07-30 10:48   ` Richard Horton
2010-07-30 11:12   ` Jan Engelhardt

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=4C514783.2000603@unipex.it \
    --to=michele.petrazzo@unipex.it \
    --cc=jengelh@medozas.de \
    --cc=netfilter@vger.kernel.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