From: "John A. Sullivan III" <john.sullivan@nexusmgmt.com>
To: "Geffrey Velásquez" <g_netfilter@netfids.com>
Cc: netfilter@lists.netfilter.org
Subject: Re: Protecting against DoS
Date: Tue, 09 Dec 2003 13:01:31 -0500 [thread overview]
Message-ID: <1070992891.1867.19.camel@jasiiitosh.nexusmgmt.com> (raw)
In-Reply-To: <9659.200.48.142.50.1070997074.squirrel@www.netfids.com>
On Tue, 2003-12-09 at 14:11, Geffrey Velásquez wrote:
> Hi,
>
> > Hello,
> >
> > First make sure you are using tcpsyn_cookies:
> >
> > echo 1 > /proc/sys/net/ipv4/tcp_syncookies -- if you have not compiled
>
>
> Is that valid for forwarded packets? or only destinated to the firewall?
>
<snip>
I'm glad you brought that up. In fact, I'm delighted at this entire
discussion since we are developing the final self-protection rules for
use in the ISCS project.
We have avoided using these /proc settings for just that concern - that
they are mostly for the gateway itself and not for the devices being
protected by it whether it is anti-spoofing with rp_filter or protecting
against syn_floods. Is this assumption of ours true? Thanks, all - John
--
John A. Sullivan III
Chief Technology Officer
Nexus Management
+1 207-985-7880
john.sullivan@nexusmgmt.com
---
If you are interested in helping to develop a GPL enterprise class
VPN/Firewall/Security device management console, please visit
http://iscs.sourceforge.net
next prev parent reply other threads:[~2003-12-09 18:01 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-09 19:11 Protecting against DoS Geffrey Velásquez
2003-12-09 18:01 ` John A. Sullivan III [this message]
2003-12-09 18:16 ` Ralf Spenneberg
2003-12-09 18:41 ` John A. Sullivan III
-- strict thread matches above, loose matches on Subject: below --
2003-12-09 15:43 Pasi Kärkkäinen
2003-12-09 16:02 ` Michael Gale
2003-12-09 16:28 ` Pasi Kärkkäinen
2003-12-09 16:40 ` Michael Gale
2003-12-09 16:51 ` Pasi Kärkkäinen
2003-12-09 17:06 ` Michael Gale
2003-12-09 17:13 ` Pasi Kärkkäinen
2003-12-09 19:20 ` Geffrey Velásquez
2003-12-09 20:10 ` Arnt Karlsen
2003-12-10 16:53 ` Pasi Kärkkäinen
2004-01-11 1:50 ` Peter Frischknecht
2004-01-26 10:45 ` Pasi Kärkkäinen
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