From: "Aldo Lagana" <alagana@discmail.com>
To: netfilter@lists.netfilter.org
Subject: Filtering in the nat table - opinions wanted
Date: Mon, 24 Mar 2003 13:20:55 -0500 [thread overview]
Message-ID: <003501c2f232$1c0a5140$6d64a8c0@discmail.com> (raw)
[-- Attachment #1: Type: text/plain, Size: 595 bytes --]
by default I set the nat chains (PREROUTING POSTROUTING, etc) to ACCEPT. first off is this bad?
For my web & mail servers using DNAT, I need to add rules - and I do. Same w/ SNAT rules...
The problem has come up with our mail server - we were getting spam from one IP address - since my DNAT rule was ACCEPT and forward, the mail server kept getting these spam messages. I stopped the SPAM by adding a rule to the beginning of PREROUTING to DROP packets from that address.
This made me start thinking - am I doing it right by having all the nat chains default ACCEPT?
aldo
[-- Attachment #2: Type: text/html, Size: 1462 bytes --]
next reply other threads:[~2003-03-24 18:20 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-24 18:20 Aldo Lagana [this message]
2003-03-24 19:32 ` Filtering in the nat table - opinions wanted Kim Jensen
2003-03-24 22:09 ` Joel Newkirk
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='003501c2f232$1c0a5140$6d64a8c0@discmail.com' \
--to=alagana@discmail.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