From: Jeffrey Laramie <JALaramie@Loudoun-Fairfax.com>
To: Netfilter <netfilter@lists.netfilter.org>
Subject: Re: MAC Block for the DHCP via iptables
Date: Mon, 17 Nov 2003 12:42:33 -0500 [thread overview]
Message-ID: <3FB90889.9040804@Loudoun-Fairfax.com> (raw)
In-Reply-To: <200311171702.hAHH2pj22305@agate.rockstone.co.uk>
Antony Stone wrote:
>On Monday 17 November 2003 4:35 pm, Chandana Bandara wrote:
>
>
>
>>Hi Mr.Antony & ALL ,
>>
>>iptables -P INPUT DROP
>>iptables -P FORWARD DROP
>>iptables -P OUTPUT DROP.........only with those policies ,
>>should block the all incomming , outgoing from the machine ?????
>>
>>
>
>Assuming you have flushed the rules as well, with:
>
>iptables -F INPUT
>iptables -F FORWARD
>iptables -F OUTPUT
>
>then no IP traffic will be allowed into, out of, or through, the machine.
>
>
>
Chandana, Antony is making a theoretical point here. Your loopback interface uses the OUTPUT chain and dropping every OUTPUT packet could cause some unexpected problems. I wouldn't recommend doing this. If you ever really wanted to block *all* traffic just unplug the network card(s). It's a lot easier and 100% secure. I hope Mr. Curleybaces reads this too or he could be in for a big surprise :-)
Jeff
next prev parent reply other threads:[~2003-11-17 17:42 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-17 16:35 MAC Block for the DHCP via iptables Chandana Bandara
2003-11-17 17:02 ` Antony Stone
2003-11-17 17:42 ` Jeffrey Laramie [this message]
2003-11-17 17:57 ` Antony Stone
2003-11-17 18:17 ` Jeffrey Laramie
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=3FB90889.9040804@Loudoun-Fairfax.com \
--to=jalaramie@loudoun-fairfax.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