From: "Tyler J. Wagner" <tyler@tolaris.com>
To: Grant Taylor <gtaylor@riverviewtech.net>
Cc: Mail List - Netfilter <netfilter@vger.kernel.org>
Subject: Re: ssh session are hanging when firewall is restarted
Date: Thu, 25 Aug 2011 08:28:46 +0100 [thread overview]
Message-ID: <4E55F9AE.3010506@tolaris.com> (raw)
In-Reply-To: <4E55E602.6040905@riverviewtech.net>
On 2011-08-25 07:04, Grant Taylor wrote:
> I'd sit down and think about how frequently this ""problem (such as it is)
> happens and if it has enough impact to cause me to want to re-design
> firewall rules to take it in to account.
Indeed. A better solution:
-A INPUT -p tcp ! --syn -m state --state NEW -j DROP
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p tcp -m tcp --dport 22 -j ACCEPT
If your firewall script clears the connection states (conntrack -F) or
unloads and reloads the kernel modules (thus doing the same thing), you
will always have this problem, and no different iptables design will fix it.
Regards,
Tyler
--
"The Congress shall have Power . . . To promote the Progress of Science
and useful Arts, by securing for limited Times to Authors and Inventors
the exclusive Right to their respective Writings and Discoveries."
-- Article I, Section 8, U.S. Constitution
next prev parent reply other threads:[~2011-08-25 7:28 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-24 13:42 ssh session are hanging when firewall is restarted Adishesh M
2011-08-25 5:41 ` Adishesh M
2011-08-25 6:04 ` Grant Taylor
2011-08-25 7:28 ` Tyler J. Wagner [this message]
2011-08-25 8:06 ` Jan Engelhardt
2011-08-25 10:15 ` Pandu Poluan
2011-08-25 10:34 ` Adishesh M
2011-08-25 10:51 ` Tyler J. Wagner
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=4E55F9AE.3010506@tolaris.com \
--to=tyler@tolaris.com \
--cc=gtaylor@riverviewtech.net \
--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 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.