Date: Wed, 29 Oct 2003 13:03:44 -0800 From: Lars Eggert <larse@ISI.EDU> To: Eric Masson <e-masson@kisoft-services.com> Cc: Mailing List FreeBSD Network <freebsd-net@FreeBSD.org> Subject: Re: ipsec tunnels & packet length issues Message-ID: <3FA02B30.90805@isi.edu> In-Reply-To: <8665iehd1i.fsf@t39bsdems.interne.kisoft-services.com> References: <8665iehd1i.fsf@t39bsdems.interne.kisoft-services.com>
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This is a cryptographically signed message in MIME format. --------------ms070303060601040704090005 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Eric Masson wrote: > > If i reduce lan interface mtu on "Host" to approximately 1450, the > tunnel works fine, so it seems that "Tunnel Endpoint" can't process > correctly packets with a size of 1500 bytes. > > If more information regarding this issue is needed, just ask. > Is this a known issue ? > Except playing with mtu, is there a fix ? See the section on PMTU discovery in draft-touch-ipsec-vpn-06. If the requirements of your setup allow is, IPIP gif tunnels together with IPsec transport mode (as described in the ID) can address this issue. Lars -- Lars Eggert <larse@isi.edu> USC Information Sciences Institute --------------ms070303060601040704090005 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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