From owner-freebsd-security Thu Mar 22 12:18:29 2001 Delivered-To: freebsd-security@freebsd.org Received: from www3.infolink.com.br (www3.infolink.com.br [200.255.108.4]) by hub.freebsd.org (Postfix) with ESMTP id C1EF237B71D for ; Thu, 22 Mar 2001 12:18:25 -0800 (PST) (envelope-from apina@infolink.com.br) Received: from diala11 (unverified [200.255.108.11]) by www3.infolink.com.br (Vircom SMTPRS 4.2.181) with SMTP id for ; Thu, 22 Mar 2001 17:18:22 -0300 Message-ID: <004601c0b30d$3e718e30$0b6cffc8@infolink.com.br> Reply-To: "Antonio Carlos Pina" From: "Antonio Carlos Pina" To: References: Subject: Re: DoS attack - advice needed Date: Thu, 22 Mar 2001 17:18:22 -0300 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4029.2901 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4029.2901 Sender: owner-freebsd-security@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Hello Chris, I will give you just one reason: Path-mtu discovery. Unless you have such type of icmp enabled, some networks won't access your site. Best Regards, Cordialmente, Antonio Carlos Pina Diretor de Tecnologia INFOLINK Internet http://www.infolink.com.br ----- Original Message ----- From: "Chris Byrnes" To: Cc: "Marc Rogers" ; Sent: Thursday, March 22, 2001 2:22 PM Subject: Re: DoS attack - advice needed > > Do *NOT* block ICMP point blank at ALL. If you need to filter certain > > type's and code's, fine. But NEVER slap an embargo on the entire ICMP > > protocol. The mentality to do this blows me away every time I hear it > > uttered from people. > > Why? If you have idiots running ping -f yourserver.com from 150 ISPs > around the world, you're going to want to filter ICMP. That's what I did > awhile back. > > And I haven't found a valid reason to re-enable it. > > > > + Chris Byrnes, chris@JEAH.net > + JEAH Communications > + 1-866-AWW-JEAH (Toll-Free) > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-security" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message