Date: Mon, 08 Apr 2002 14:20:12 -0700 From: Lars Eggert <larse@ISI.EDU> To: "Rogier R. Mulhuijzen" <drwilco@drwilco.net> Cc: mgt@hytekblue.com, freebsd-net@FreeBSD.ORG Subject: Re: IPsec tunnel mode Message-ID: <3CB2098C.5080904@isi.edu> References: <5.1.0.14.0.20020408202757.01cac470@mail.drwilco.net>
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This is a cryptographically signed message in MIME format. --------------ms000906070407080108010409 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Rogier R. Mulhuijzen wrote: >> http://www.x-itec.de/projects/tuts/ipsec-howto.txt > > Unfortunately this howto, like any other mention of IPsec & > tunneling on the net uses the gif interface. Which is IPoverIP, and > this does not seem to match with IPsec tunnel devices. There are no IPsec tunnel devices in KAME. IPsec defines "security associations" (SAs), which are not represented as devices in the routing table in KAME. Thus, you can't use routes to direct traffic into these tunnel mode SAs, you need to set up your security policies with the correct selectors (think firewall-like matching). *Many* tutorials on the net do not understand this disctinction, and tell you to set up an IPIP tunnel (using a gif) and an IPsec tunnel mode SA in parallel. This is a bad hack, since you (ab)use a side effect of creating an IPIP tunnel device (it can be used for route entries) to redirect traffic into your (separate) tunnel mode SA. Very roughly, you set up the IPIP tunnel, then yank out the packets destined for it during outbound processing and force them over an IPsec tunnel mode SA. Use EITHER IPsec tunnel mode alone OR IPIP tunnels and IP transport mode (draft-touch-ipsec-vpn). Mixing both can work in some scenarios where the dependencies between side effects are just right, but in general, it's a broken approach. Lars -- Lars Eggert <larse@isi.edu> Information Sciences Institute http://www.isi.edu/larse/ University of Southern California --------------ms000906070407080108010409 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 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIInzCC ArUwggIeoAMCAQICAwWBRzANBgkqhkiG9w0BAQIFADCBkjELMAkGA1UEBhMCWkExFTATBgNV BAgTDFdlc3Rlcm4gQ2FwZTESMBAGA1UEBxMJQ2FwZSBUb3duMQ8wDQYDVQQKEwZUaGF3dGUx HTAbBgNVBAsTFENlcnRpZmljYXRlIFNlcnZpY2VzMSgwJgYDVQQDEx9QZXJzb25hbCBGcmVl bWFpbCBSU0EgMjAwMC44LjMwMB4XDTAxMDgyNDE2NDAwMFoXDTAyMDgyNDE2NDAwMFowVDEP MA0GA1UEBBMGRWdnZXJ0MQ0wCwYDVQQqEwRMYXJzMRQwEgYDVQQDEwtMYXJzIEVnZ2VydDEc MBoGCSqGSIb3DQEJARYNbGFyc2VAaXNpLmVkdTCBnzANBgkqhkiG9w0BAQEFAAOBjQAwgYkC gYEA0AvLBsD78nxcUHeHkaMgl3b4qYPnfgbf8Lh+HQP8RgGMRG/Yb+vTpkGezlwt9pkJxiD1 1uZDy4CNNJUu3gKxKSb+zRV70O+lkwwftuHoLHoH4xwo3LcQ2LGDpd+I95tUN4dfJ3TmeEcU SF50dC/SuUI4w8AlhXQ8IxrhgdayTpECAwEAAaNWMFQwKgYFK2UBBAEEITAfAgEAMBowGAIB BAQTTDJ1TXlmZkJOVWJOSkpjZFoyczAYBgNVHREEETAPgQ1sYXJzZUBpc2kuZWR1MAwGA1Ud EwEB/wQCMAAwDQYJKoZIhvcNAQECBQADgYEAheZhn0pQA8zI7U2K1ZIAl11j0a1DKxnp3GtT vOUrGRB3WvYxidvdZ1kizhEsWeXU81TkNDH0DaRqtOEeu6Q2OhB+jeKEqY7IDAJE4/fI0e+d 6PnG1hd+vEvYmsKHkmzBhPc94XUOKNWO+qVNP2NGyNI3QIDy5wX4fdcOo1S34r4wggK1MIIC HqADAgECAgMFgUcwDQYJKoZIhvcNAQECBQAwgZIxCzAJBgNVBAYTAlpBMRUwEwYDVQQIEwxX ZXN0ZXJuIENhcGUxEjAQBgNVBAcTCUNhcGUgVG93bjEPMA0GA1UEChMGVGhhd3RlMR0wGwYD VQQLExRDZXJ0aWZpY2F0ZSBTZXJ2aWNlczEoMCYGA1UEAxMfUGVyc29uYWwgRnJlZW1haWwg UlNBIDIwMDAuOC4zMDAeFw0wMTA4MjQxNjQwMDBaFw0wMjA4MjQxNjQwMDBaMFQxDzANBgNV BAQTBkVnZ2VydDENMAsGA1UEKhMETGFyczEUMBIGA1UEAxMLTGFycyBFZ2dlcnQxHDAaBgkq hkiG9w0BCQEWDWxhcnNlQGlzaS5lZHUwgZ8wDQYJKoZIhvcNAQEBBQADgY0AMIGJAoGBANAL ywbA+/J8XFB3h5GjIJd2+KmD534G3/C4fh0D/EYBjERv2G/r06ZBns5cLfaZCcYg9dbmQ8uA jTSVLt4CsSkm/s0Ve9DvpZMMH7bh6Cx6B+McKNy3ENixg6XfiPebVDeHXyd05nhHFEhedHQv 0rlCOMPAJYV0PCMa4YHWsk6RAgMBAAGjVjBUMCoGBStlAQQBBCEwHwIBADAaMBgCAQQEE0wy dU15ZmZCTlViTkpKY2RaMnMwGAYDVR0RBBEwD4ENbGFyc2VAaXNpLmVkdTAMBgNVHRMBAf8E AjAAMA0GCSqGSIb3DQEBAgUAA4GBAIXmYZ9KUAPMyO1NitWSAJddY9GtQysZ6dxrU7zlKxkQ d1r2MYnb3WdZIs4RLFnl1PNU5DQx9A2karThHrukNjoQfo3ihKmOyAwCROP3yNHvnej5xtYX frxL2JrCh5JswYT3PeF1DijVjvqlTT9jRsjSN0CA8ucF+H3XDqNUt+K+MIIDKTCCApKgAwIB AgIBDDANBgkqhkiG9w0BAQQFADCB0TELMAkGA1UEBhMCWkExFTATBgNVBAgTDFdlc3Rlcm4g Q2FwZTESMBAGA1UEBxMJQ2FwZSBUb3duMRowGAYDVQQKExFUaGF3dGUgQ29uc3VsdGluZzEo MCYGA1UECxMfQ2VydGlmaWNhdGlvbiBTZXJ2aWNlcyBEaXZpc2lvbjEkMCIGA1UEAxMbVGhh d3RlIFBlcnNvbmFsIEZyZWVtYWlsIENBMSswKQYJKoZIhvcNAQkBFhxwZXJzb25hbC1mcmVl bWFpbEB0aGF3dGUuY29tMB4XDTAwMDgzMDAwMDAwMFoXDTAyMDgyOTIzNTk1OVowgZIxCzAJ BgNVBAYTAlpBMRUwEwYDVQQIEwxXZXN0ZXJuIENhcGUxEjAQBgNVBAcTCUNhcGUgVG93bjEP MA0GA1UEChMGVGhhd3RlMR0wGwYDVQQLExRDZXJ0aWZpY2F0ZSBTZXJ2aWNlczEoMCYGA1UE AxMfUGVyc29uYWwgRnJlZW1haWwgUlNBIDIwMDAuOC4zMDCBnzANBgkqhkiG9w0BAQEFAAOB jQAwgYkCgYEA3jMypmPHCSVFPtJueCdngcXaiBmClw7jRCmKYzUqbXA8+tyu9+50bzC8M5B/ +TRxoKNtmPHDT6Jl2w36S/HW3WGl+YXNVZo1Gp2Sdagnrthy+boC9tewkd4c6avgGAOofENC UFGHgzzwObSbVIoTh/+zm51JZgAtCYnslGvpoWkCAwEAAaNOMEwwKQYDVR0RBCIwIKQeMBwx GjAYBgNVBAMTEVByaXZhdGVMYWJlbDEtMjk3MBIGA1UdEwEB/wQIMAYBAf8CAQAwCwYDVR0P BAQDAgEGMA0GCSqGSIb3DQEBBAUAA4GBAHMbbyZli/8VNEtZYortRL5Jx+gNu4+5DWomKmKE H7iHY3QcbbfPGlORS+HN5jjZ7VD0Omw0kqzmkpxuwSMBwgmn70uuct0GZ/VQby5YuLYLwVBX tewc1+8XttWIm7eiiBrtOVs5fTT8tpYYJU1q9J3Fw5EvqZa4BTxS/N3pYgNIMYICpjCCAqIC AQEwgZowgZIxCzAJBgNVBAYTAlpBMRUwEwYDVQQIEwxXZXN0ZXJuIENhcGUxEjAQBgNVBAcT CUNhcGUgVG93bjEPMA0GA1UEChMGVGhhd3RlMR0wGwYDVQQLExRDZXJ0aWZpY2F0ZSBTZXJ2 aWNlczEoMCYGA1UEAxMfUGVyc29uYWwgRnJlZW1haWwgUlNBIDIwMDAuOC4zMAIDBYFHMAkG BSsOAwIaBQCgggFhMBgGCSqGSIb3DQEJAzELBgkqhkiG9w0BBwEwHAYJKoZIhvcNAQkFMQ8X DTAyMDQwODIxMjAxMlowIwYJKoZIhvcNAQkEMRYEFMLv1pKjM3nmIGtBXxt7jeKEdSjlMFIG CSqGSIb3DQEJDzFFMEMwCgYIKoZIhvcNAwcwDgYIKoZIhvcNAwICAgCAMA0GCCqGSIb3DQMC AgFAMAcGBSsOAwIHMA0GCCqGSIb3DQMCAgEoMIGtBgsqhkiG9w0BCRACCzGBnaCBmjCBkjEL MAkGA1UEBhMCWkExFTATBgNVBAgTDFdlc3Rlcm4gQ2FwZTESMBAGA1UEBxMJQ2FwZSBUb3du MQ8wDQYDVQQKEwZUaGF3dGUxHTAbBgNVBAsTFENlcnRpZmljYXRlIFNlcnZpY2VzMSgwJgYD VQQDEx9QZXJzb25hbCBGcmVlbWFpbCBSU0EgMjAwMC44LjMwAgMFgUcwDQYJKoZIhvcNAQEB BQAEgYBMUsvvxb3A1Zm6LrcZlPGk5pZonoM7KTGhr4CgV+34abP5ocxtJPfYSsq13EVHlO5b 5TDzYfEOd0L7JNsjIJy5mg13TusJlM1dFI3rBNUk4ZsNtgtM6lYtOeoZUVOSU0lC6kNNok4O nDbdKmUNWP32DW4APY7nsuMUoBMPXd+j7AAAAAAAAA== --------------ms000906070407080108010409-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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