From owner-freebsd-security Thu May 31 12: 0:47 2001 Delivered-To: freebsd-security@freebsd.org Received: from silby.com (cb34181-a.mdsn1.wi.home.com [24.14.173.39]) by hub.freebsd.org (Postfix) with ESMTP id 6C43837B43C for ; Thu, 31 May 2001 12:00:44 -0700 (PDT) (envelope-from silby@silby.com) Received: (qmail 73997 invoked by uid 1000); 31 May 2001 19:00:43 -0000 Received: from localhost (sendmail-bs@127.0.0.1) by localhost with SMTP; 31 May 2001 19:00:43 -0000 Date: Thu, 31 May 2001 14:00:43 -0500 (CDT) From: Mike Silbersack To: Rob Simmons Cc: Liran Dahan , Subject: Re: Limiting TCP RST Response Packets In-Reply-To: Message-ID: <20010531135800.F73746-100000@achilles.silby.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-security@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org On Thu, 31 May 2001, Rob Simmons wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: RIPEMD160 > > You will need to add the following line to your kernel config file, and > recompile the kernel: > > options TCP_RESTRICT_RST > > You should also read the comments about this option in the LINT file. No. Bad. This is a paranoid response that will reduce the general friendlyness of your box, and doesn't help much (if it all) more than simply letting the built-in ratelimiting function. However, if you wish to reduce the rst packets per second, tune the net.inet.icmp.icmplim sysctl. Don't reduce the count to zero, that means unlimited. I find 20 to be a nice limit, personally. Mike "Silby" Silbersack To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message