From owner-freebsd-net@FreeBSD.ORG Fri Nov 7 07:15:36 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 4508216A4CE for ; Fri, 7 Nov 2003 07:15:36 -0800 (PST) Received: from boreas.isi.edu (boreas.isi.edu [128.9.160.161]) by mx1.FreeBSD.org (Postfix) with ESMTP id 84EBC43FE5 for ; Fri, 7 Nov 2003 07:15:35 -0800 (PST) (envelope-from larse@ISI.EDU) Received: from isi.edu (ca-herbch-cuda2-c3c-49.stmnca.adelphia.net [67.20.211.49]) by boreas.isi.edu (8.11.6p2+0917/8.11.2) with ESMTP id hA7FFVa28771; Fri, 7 Nov 2003 07:15:31 -0800 (PST) Message-ID: <3FABB712.7050905@isi.edu> Date: Fri, 07 Nov 2003 07:15:30 -0800 From: Lars Eggert Organization: USC Information Sciences Institute User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.6a) Gecko/20031030 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Helge Oldach References: <200311070759.IAA19949@galaxy.hbg.de.ao-srv.com> In-Reply-To: <200311070759.IAA19949@galaxy.hbg.de.ao-srv.com> Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms020205070907020407010906" cc: Drew Tomlinson cc: freebsd-net@freebsd.org Subject: Re: Routing With Two ISPs? 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: Fri, 07 Nov 2003 15:15:36 -0000 This is a cryptographically signed message in MIME format. --------------ms020205070907020407010906 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Helge Oldach wrote: > Drew Tomlinson: > >>I have a 4.8 box serving as a gateway with two connections to the >>Internet. Is there some way to set the box up so that packets are >>routed out through the same interface from which they arrived? For >>example, if a connection is initiated on port 80 from a packet arriving >>on one interface, is there a way to make the outgoing packets from my >>web server use that same interface as a gateway instead of the default >>interface? > > > Unfortunately not. While your application (multi-homing, aka "strong ES" > model of RFC 1122) would appear simpler, a general solution would target > at true policy-based routing. For some simple setups, you can use ipfw fwd rules to forward on something other than destination address. But I agree that for more complex things you need some implementation of policy routing. Lars -- Lars Eggert USC Information Sciences Institute --------------ms020205070907020407010906 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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