From: "Jorge Dávila" <jorgedavilalopez@gmail.com>
To: netfilter@vger.kernel.org
Subject: Re: Correct Chains to Apply Rules
Date: Tue, 17 May 2011 16:06:32 -0600 [thread overview]
Message-ID: <BANLkTi=HLSfceXiVuEc45QHQOPd0ebFCPg@mail.gmail.com> (raw)
In-Reply-To: <1305669045.20717.1453045045@webmail.messagingengine.com>
Incoming traffic to eth0 or eth1 can be directed to the box itself or
must be FORWARDed in the case of:
1) Incoming traffic on eth0 directed to the internal network
2) Incoming traffic on eth1 directed to Internet
Jorge.
On Tue, May 17, 2011 at 3:50 PM, <netfilter@buglecreek.com> wrote:
> OK. Thanks. So to block/allow traffic from network A to/from network B
> I would apply my rules to the FORWARD chain using a source/destination.
> The INPUT and OUTPUT chains on eth0 and eth1 are only for traffic bound
> for the firewall/router box itself?
>
> On Tue, 17 May 2011 23:29 +0200, "Pascal Hambourg"
> <pascal.mail@plouf.fr.eu.org> wrote:
>> Hello,
>>
>> netfilter@buglecreek.com a écrit :
>> >
>> > In the following scenario. Someone makes a new HTTP request from the
>> > Internet that is allowed inbound on eth0 and goes out of the eth1
>> > interface to the HTTP server in the server network.
>> > The HTTP server in the server network sends the response to the original
>> > requester.
>> >
>> > Does the response ever hit the INPUT chain of ETH1?
>>
>> No.
>>
>> > Or does it immediately go to the FORWARD chain
>>
>> Yes.
>>
>> > and out the OUTPUT chain of eth0.
>>
>> No.
>> The three filter chains are mutually exclusive : a packet can only go
>> through one of them. Forwarded packets only go through the FORWARD chain.
>>
> --
> To unsubscribe from this list: send the line "unsubscribe netfilter" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
--
Jorge Isaac Dávila López
+505 8430 5462
jorgedavilalopez@gmail.com
---
next prev parent reply other threads:[~2011-05-17 22:06 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-17 21:14 Correct Chains to Apply Rules netfilter
2011-05-17 21:29 ` Pascal Hambourg
2011-05-17 21:50 ` netfilter
2011-05-17 22:06 ` Jorge Dávila [this message]
2011-05-17 22:19 ` Andrew Beverley
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='BANLkTi=HLSfceXiVuEc45QHQOPd0ebFCPg@mail.gmail.com' \
--to=jorgedavilalopez@gmail.com \
--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;
as well as URLs for NNTP newsgroup(s).