From owner-freebsd-hackers Fri Mar 12 21:39:39 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from ns1.adsu.bellsouth.com (ns1.adsu.bellsouth.com [205.152.173.2]) by hub.freebsd.org (Postfix) with ESMTP id 90B9F14DCC for ; Fri, 12 Mar 1999 21:39:17 -0800 (PST) (envelope-from ck@adsu.bellsouth.com) Received: from oreo (grommit.adsu.bellsouth.com [205.152.173.122]) by ns1.adsu.bellsouth.com (8.9.1a/8.9.1) with SMTP id AAA12553; Sat, 13 Mar 1999 00:38:09 -0500 (EST) From: "Christian Kuhtz" To: "Alfred Perlstein" , "Doug White" Cc: Subject: RE: Will IPFW pass GRE packets? Date: Sat, 13 Mar 1999 00:33:39 -0500 Message-ID: <002c01be6d13$0cdc8f60$7aad98cd@oreo.adsu.bellsouth.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook 8.5, Build 4.71.2173.0 In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V4.72.3110.3 Importance: Normal Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > GRE is some windows NT thing? If it is, someone has already figured this > out for you, the lists have it. GRE stands for "Generic Route Encapsulation" and is an IETF standard as defined by RFC1701 (http://www.adsu.bellsouth.com/pub/ietf/rfc/rfc1701 and RFC1702). It is used to tunnel all sorts of things across IPv4 networks, including IPv4 itself. It has jack squat to do with NT. Cisco IOS has probably the most implementations of using GRE for various tunnels. Not very many other vendors implement it (but now that Tony works for Juniper, I'm sure they will too :). Sometimes IPSec in tunnel mode is used to provide GRE with encryption based security. Cheers, Chris -- BellSouth Corporation, Advanced Data Services, Sr. Network Architect ck@adsu.bellsouth.com -wk, ck@gnu.org -hm "Affiliation given for identification, not representation." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message