Date: Wed, 19 Feb 2003 21:18:13 -0800 From: Lars Eggert <larse@ISI.EDU> To: George Hartzell <hartzell@kestrel.alerce.com> Cc: freebsd-questions@freebsd.org, freebsd-mobile@freebsd.org Subject: Re: FreeBSD 4.7-REL-p3 and an IPsec connection to Linksys BEFVP41 Message-ID: <3E546515.4000703@isi.edu> In-Reply-To: <15956.23535.146549.735318@rosebud.alerce.com> References: <15956.23535.146549.735318@rosebud.alerce.com>
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This is a cryptographically signed message in MIME format. --------------ms010609020108010802090706 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit On 2/19/2003 8:39 PM, George Hartzell wrote: > I'd like to set up an IPsec connection between my laptop running > FreeBSD 4.7-REL-p3 and a Linksys BEFVP41 router w/ built in IPsec > capability. > > I've found a number of sites w/ information on setting up ipsec > between a pair of FreeBSD machines, including: > > http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/ipsec.html > http://www.freebsddiary.org/ipsec-tunnel.php > http://www.daemonnews.org/200101/ipsec-howto.html > http://www.bsdtoday.com/2002/April/Features671.html > > But none that talk about getting FreeBSD's IPsec talking to anything > non-FreeBSD. > > All of the methods are based on setting up a gif tunnel and passing > the packets over that. Not really. There are a number of different ways to set this up, and only one (valid) one uses gif tunnels: 1. Use IPsec transport mode. The handbook (1st link) explains how to set this up. 2. Use IPsec tunnel mode. Again, the handbook describes the setup, so does the bsdtoday article. (Note that these two do not use IPIP gif tunnels!) 3. Use an IPIP gif tunnel and IPsec transport mode, as described in draft-touch-ipsec-vpn, and the daemonnews article. This is an alternative to IPsec tunnel mode that has advantages when running dynamic routing - you don't seem to, so you should stick to vanilla IPsec, esp. since you only control one end. You do NOT want to follow the freebsddiary article, which sets up parallel IPIP gif tunnels and IPsec tunnel mode SAs. It abuses the duplicate tunnels for routing, and can result in subtle interactions that can make your traffic go silently unencrypted. (I've contacted the author a long time ago, but he doesn't seem to belive in fixing "diary" entries.) > I've tried a number of variations on the > recommended recipes, and at best I can watch the isakmp packet going > from the laptop towards the router and get see an icmp packet back > from the router that suggests the the gif tunnel isn't what it wants > to see (sadly, I didn't save the exact message, but can recreate it if > it's important enough). Without a lot more information about your configuration, we can only guess at the issues. > So, the quick question is, has anyone set up a FreeBSD laptop as a > "road warrior" to an IPsec router? I'd appreciate any pointers. All three aproaches above can be made to work, as explained by the tutorials you cite. The question is, which one is supported by your Linksys box? Lars -- Lars Eggert <larse@isi.edu> USC Information Sciences Institute --------------ms010609020108010802090706 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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