Date: Thu, 17 Oct 2002 17:56:01 -0700 From: Lars Eggert <larse@ISI.EDU> To: Charles Henrich <henrich@sigbus.com> Cc: freebsd-net@freebsd.org Subject: Re: IPSEC/NAT issues Message-ID: <3DAF5C21.6000108@isi.edu> References: <20021017162243.B89519@sigbus.com> <3DAF509C.6030002@isi.edu> <20021017172905.A91625@sigbus.com>
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This is a cryptographically signed message in MIME format. --------------ms090601060501040507040902 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Charles Henrich wrote: > The nat daemon does not log any rejections of the packet, however in my kernel > log, I see a > > Oct 17 17:23:51 dmz /kernel: Connection attempt to TCP B:3283 from C:22 Your packets don't seem to reach natd after IPsec inbound processing. Looks like ipfw processing happens before IPsec (so natd sees the IPsec'ed packets, but doesn't know anything about them), and gets thems them after IPsec inbound processing. What you want is a way to do IPsec first, and then ipfw processing, but I don't know if that can be done. Try configuring an IPIP tunnel between B and C, and transport-mode IPsec that. That way, your NAT packets get tunneled, and the tunneled packets secured. On inbound, security processing comes first, then decapsulation, then ipfw. Lars -- Lars Eggert <larse@isi.edu> USC Information Sciences Institute --------------ms090601060501040507040902 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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