From: Andi Kleen <ak@suse.de>
To: Tim Gardner <timg@tpi.com>
Cc: YOSHIFUJI Hideaki / ???????????? <yoshfuji@linux-ipv6.org>,
pekkas@netcore.fi, laforge@gnumonks.org, netdev@oss.sgi.com
Subject: Re: [PATCH + RFC] neighbour/ARP cache scalability
Date: Tue, 21 Sep 2004 19:31:34 +0200 [thread overview]
Message-ID: <20040921173134.GC12132@wotan.suse.de> (raw)
In-Reply-To: <1095784761.3934.52.camel@tim.rtg.net>
> I've developed a variant of the Port Scan Detector (PSD) iptables filter
> that combats this very problem. It only allows so many destination
> IP/Port pairs from a given address to be opened over time. This limits
> the rate at which connections can be opened as well as the absolute
> number. For example, on my edge routers I set the policy that no single
> IP source address can create more then 64 connections within a 30 second
> sliding window. This has made a huge impact on the ARP storms that our
> network used to experience.
But also allows an easy DOS. Someone just has to spoof a lot of connections
attempts with the source address of your primary name server or
some other important service.
-Andi
next prev parent reply other threads:[~2004-09-21 17:31 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-20 22:51 [PATCH + RFC] neighbour/ARP cache scalability Harald Welte
2004-09-21 6:29 ` David S. Miller
2004-09-21 7:04 ` Andre Tomt
2004-09-21 7:37 ` Robert Olsson
2004-09-21 8:58 ` Andi Kleen
2004-09-21 11:19 ` Pekka Savola
2004-09-21 13:49 ` Harald Welte
2004-09-21 14:10 ` Pekka Savola
2004-09-21 15:14 ` YOSHIFUJI Hideaki / 吉藤英明
2004-09-21 15:36 ` Robert Olsson
2004-09-21 15:59 ` YOSHIFUJI Hideaki / 吉藤英明
2004-09-21 15:58 ` Pekka Savola
2004-09-21 16:04 ` YOSHIFUJI Hideaki / 吉藤英明
2004-09-21 16:39 ` Tim Gardner
2004-09-21 17:31 ` Andi Kleen [this message]
2004-09-21 17:58 ` Tim Gardner
2004-09-21 18:15 ` Andi Kleen
2004-09-21 20:34 ` Harald Welte
2004-09-21 20:58 ` Tim Gardner
2004-09-22 1:14 ` Harald Welte
2004-09-22 3:31 ` David S. Miller
2004-09-22 11:14 ` Harald Welte
2004-09-24 5:53 ` David S. Miller
2004-09-24 7:14 ` Glen Turner
2004-09-24 5:47 ` David S. Miller
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