From owner-freebsd-net@FreeBSD.ORG Wed Apr 2 08:21:09 2003 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id B9CDF37B401 for ; Wed, 2 Apr 2003 08:21:09 -0800 (PST) Received: from boreas.isi.edu (boreas.isi.edu [128.9.160.161]) by mx1.FreeBSD.org (Postfix) with ESMTP id 268C343FBF for ; Wed, 2 Apr 2003 08:21:09 -0800 (PST) (envelope-from larse@ISI.EDU) Received: from isi.edu (tether-13.isi.edu [128.9.235.13]) by boreas.isi.edu (8.11.6p2/8.11.2) with ESMTP id h32GL3103556; Wed, 2 Apr 2003 08:21:03 -0800 (PST) Message-ID: <3E8B0DE1.1030500@isi.edu> Date: Wed, 02 Apr 2003 08:20:49 -0800 From: Lars Eggert Organization: USC Information Sciences Institute User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.3) Gecko/20030312 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Eric Masson References: <86pto6mbxj.fsf@notbsdems.interne.kisoft-services.com> <05b901c2f881$67e907f0$52557f42@errno.com> <3E8A1122.5040304@isi.edu> <86fzp0riwl.fsf@notbsdems.interne.kisoft-services.com> In-Reply-To: <86fzp0riwl.fsf@notbsdems.interne.kisoft-services.com> Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms040003080109060300040500" cc: Sam Leffler cc: Mailing List FreeBSD Network Subject: Re: options FAST_IPSEC & tunnels X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 Apr 2003 16:21:10 -0000 This is a cryptographically signed message in MIME format. --------------ms040003080109060300040500 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Eric, On 4/2/2003 7:58 AM, Eric Masson wrote: >>>>>>"Lars" == Lars Eggert writes: > > Lars> Alternatively (and already working), you can replace IPsec tunnel > Lars> mode with IPIP (gif) tunnels and transport mode, and then use the > Lars> gif device in your firewall rules. > > If transport mode can be used to connect to a pix, it's a solution to > consider, but atm, I've found no reference to such a setup on the pix. what's a pix? But chances are, you will need to control both endpoints for my suggestion to work. > I've tried gif tunnels with ipsec tunnel mode and didn't get > reproduceable results, this setup worked once with the following gif > setup : [snip] > Next time, after a reboot (kernel switch) no packets were flowing thru > the gif tunnel. Yes, combining tunnel mode and IPIP tunnels is not a good idea. Basically, that approach creates two parallel virtual topologies, one out of IPIP tunnels, and one out of IPsec tunnel mode SAs. People often do this, because they want to route traffic into an IPsec tunnel, and the SA itself doesn't have a route entry, since they aren't devices. When using IPIP tunnels with tunnel mode, they abuse the route created by the gif device for routing, but packets will be hijacked by the tunnel mode SA, so they never actually enter gif processing (IPsec does the IPIP encapsulation internally.) Using IPIP tunnels with transport mode is valid, since packets will actually flow through the gif device, and get IPsec'ed after they are IPIP encapsulated. (In multihop topologies, they'll then need to be IPIP encapsulated again - the virtual network needs both virtual link and network layers.) Lars -- Lars Eggert USC Information Sciences Institute --------------ms040003080109060300040500 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIJtjCC AzgwggKhoAMCAQICEGZFcrfMdPXPY3ZFhNAukQEwDQYJKoZIhvcNAQEEBQAwgdExCzAJBgNV BAYTAlpBMRUwEwYDVQQIEwxXZXN0ZXJuIENhcGUxEjAQBgNVBAcTCUNhcGUgVG93bjEaMBgG A1UEChMRVGhhd3RlIENvbnN1bHRpbmcxKDAmBgNVBAsTH0NlcnRpZmljYXRpb24gU2Vydmlj ZXMgRGl2aXNpb24xJDAiBgNVBAMTG1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBDQTErMCkG CSqGSIb3DQEJARYccGVyc29uYWwtZnJlZW1haWxAdGhhd3RlLmNvbTAeFw0wMDA4MzAwMDAw MDBaFw0wNDA4MjcyMzU5NTlaMIGSMQswCQYDVQQGEwJaQTEVMBMGA1UECBMMV2VzdGVybiBD YXBlMRIwEAYDVQQHEwlDYXBlIFRvd24xDzANBgNVBAoTBlRoYXd0ZTEdMBsGA1UECxMUQ2Vy dGlmaWNhdGUgU2VydmljZXMxKDAmBgNVBAMTH1BlcnNvbmFsIEZyZWVtYWlsIFJTQSAyMDAw 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