From owner-freebsd-net@FreeBSD.ORG Thu Apr 22 08:50:29 2004 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 85F6416A5CA; Thu, 22 Apr 2004 08:50:29 -0700 (PDT) Received: from ftp.ccrle.nec.de (ftp.netlab.nec.de [195.37.70.21]) by mx1.FreeBSD.org (Postfix) with ESMTP id 3ECEC43D31; Thu, 22 Apr 2004 08:50:28 -0700 (PDT) (envelope-from lars.eggert@netlab.nec.de) Received: from netlab.nec.de (scout.netlab.nec.de [195.37.70.100]) by ftp.ccrle.nec.de (Postfix) with ESMTP id 3A891F674; Thu, 22 Apr 2004 17:55:28 +0200 (CEST) Message-ID: <4087E9C1.1010907@netlab.nec.de> Date: Thu, 22 Apr 2004 17:50:25 +0200 From: Lars Eggert Organization: NEC Network Laboratories User-Agent: Mozilla Thunderbird 0.6+ (Macintosh/20040420) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Luigi Rizzo References: <003301c42875$ccd62f10$df5561d9@ALFA> <20040422072920.A26354@xorpc.icir.org> In-Reply-To: <20040422072920.A26354@xorpc.icir.org> Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms010204030507040308060501" cc: andre@freebsd.org cc: Heinz Knocke cc: net@freebsd.org Subject: Re: simulating an LFN over 1Gb LAN Ethernet? 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: Thu, 22 Apr 2004 15:50:29 -0000 This is a cryptographically signed message in MIME format. --------------ms010204030507040308060501 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Luigi Rizzo wrote: > On Thu, Apr 22, 2004 at 04:26:26PM +0200, Heinz Knocke wrote: >> >> I'd like to simulate an LFN over LAN - my idea is to install >> testing software on 2 hosts, traffic between them would be routed >> by the 3rd one - a FreeBSD based router. To simulate long RTT the >> router would have to delay packet forwarding in at least one >> direction - does anyone know how to do it? Is it at all possible >> withou some changes in kernel source code? > > http://info.iet.unipi.it/~luigi/ip_dummynet/ Dummynet is great, but at Gigabit speeds it has issues with regard to preservation of packet inter-arrival spacing. That may or may not be a problem for what you are trying to simulate however. Lars -- Lars Eggert NEC Network Laboratories --------------ms010204030507040308060501 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 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIJ/zCC Az8wggKooAMCAQICAQ0wDQYJKoZIhvcNAQEFBQAwgdExCzAJBgNVBAYTAlpBMRUwEwYDVQQI EwxXZXN0ZXJuIENhcGUxEjAQBgNVBAcTCUNhcGUgVG93bjEaMBgGA1UEChMRVGhhd3RlIENv bnN1bHRpbmcxKDAmBgNVBAsTH0NlcnRpZmljYXRpb24gU2VydmljZXMgRGl2aXNpb24xJDAi BgNVBAMTG1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBDQTErMCkGCSqGSIb3DQEJARYccGVy c29uYWwtZnJlZW1haWxAdGhhd3RlLmNvbTAeFw0wMzA3MTcwMDAwMDBaFw0xMzA3MTYyMzU5 NTlaMGIxCzAJBgNVBAYTAlpBMSUwIwYDVQQKExxUaGF3dGUgQ29uc3VsdGluZyAoUHR5KSBM dGQuMSwwKgYDVQQDEyNUaGF3dGUgUGVyc29uYWwgRnJlZW1haWwgSXNzdWluZyBDQTCBnzAN BgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEAxKY8VXNV+065yplaHmjAdQRwnd/p/6Me7L3N9Vvy Gna9fww6YfK/Uc4B1OVQCjDXAmNaLIkVcI7dyfArhVqqP3FWy688Cwfn8R+RNiQqE88r1fOC dz0Dviv+uxg+B79AgAJk16emu59l0cUqVIUPSAR/p7bRPGEEQB5kGXJgt/sCAwEAAaOBlDCB kTASBgNVHRMBAf8ECDAGAQH/AgEAMEMGA1UdHwQ8MDowOKA2oDSGMmh0dHA6Ly9jcmwudGhh d3RlLmNvbS9UaGF3dGVQZXJzb25hbEZyZWVtYWlsQ0EuY3JsMAsGA1UdDwQEAwIBBjApBgNV HREEIjAgpB4wHDEaMBgGA1UEAxMRUHJpdmF0ZUxhYmVsMi0xMzgwDQYJKoZIhvcNAQEFBQAD gYEASIzRUIPqCy7MDaNmrGcPf6+svsIXoUOWlJ1/TCG4+DYfqi2fNi/A9BxQIJNwPP2t4WFi w9k6GX6EsZkbAMUaC4J0niVQlGLH2ydxVyWN3amcOY6MIE9lX5Xa9/eH1sYITq726jTlEBpb NU1341YheILcIRk13iSx0x1G/11fZU8wggNaMIICw6ADAgECAgMLU6IwDQYJKoZIhvcNAQEE BQAwYjELMAkGA1UEBhMCWkExJTAjBgNVBAoTHFRoYXd0ZSBDb25zdWx0aW5nIChQdHkpIEx0 ZC4xLDAqBgNVBAMTI1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBJc3N1aW5nIENBMB4XDTAz MTIxNTEyMzEyOFoXDTA0MTIxNDEyMzEyOFowgYQxDzANBgNVBAQTBkVnZ2VydDENMAsGA1UE KhMETGFyczEUMBIGA1UEAxMLTGFycyBFZ2dlcnQxKDAmBgkqhkiG9w0BCQEWGWxhcnMuZWdn ZXJ0QG5ldGxhYi5uZWMuZGUxIjAgBgkqhkiG9w0BCQEWE2xhcnMuZWdnZXJ0QGdteC5uZXQw ggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDWps58Zq8Buu2DKDl9crbvzSo6zWsZ TkQLr5zOTqUMs/eU7Mcohv64O4IxWWYGLfYsjDRxUlmdHdJUbyTtUh2lH452DUDJByXidlLm RDgohG0AVwztedqy1+hE3VnCdpMhUGks+6ntrr3dKSxMgLM0AM1kPWsH9lWX6IOPdxOC30gM PiQ65zH9PR70befQLgFPKcAv0wP8210l05n8ekwYAcq2cm3/j+nuDu0HEh5pgsnY7cVELeNJ ODvr4IiE1t3c2w4+0Nc/WJrqGCMl+gZ8c+7FtzjoyDeEsCjNFDeA2ymNd+10O6kjwvPHlzPr 3rW73RDRPAjMJ49HXlueiuoNAgMBAAGjdzB1MCoGBStlAQQBBCEwHwIBADAaMBgCAQQEE0wy dU15ZmZCTlViTkpKY2RaMnMwOQYDVR0RBDIwMIEZbGFycy5lZ2dlcnRAbmV0bGFiLm5lYy5k ZYETbGFycy5lZ2dlcnRAZ214Lm5ldDAMBgNVHRMBAf8EAjAAMA0GCSqGSIb3DQEBBAUAA4GB AHgrv3SQFD4AS4lY4oKcI3iTHcclEHbYfg3UUb8zzCUsl+OJoz0nmebGmOL+tvNj5GvCrWnN H4LvVLh8ZBhFXms7eKJ1YiHgbKwTRK23P8Y5NDit5ico0ZjpFWeenUWj3ajEbN6n4K8dNp+C 0b2apnSrlFVWY6BucZFIYqQ1Lf91MIIDWjCCAsOgAwIBAgIDC1OiMA0GCSqGSIb3DQEBBAUA MGIxCzAJBgNVBAYTAlpBMSUwIwYDVQQKExxUaGF3dGUgQ29uc3VsdGluZyAoUHR5KSBMdGQu MSwwKgYDVQQDEyNUaGF3dGUgUGVyc29uYWwgRnJlZW1haWwgSXNzdWluZyBDQTAeFw0wMzEy MTUxMjMxMjhaFw0wNDEyMTQxMjMxMjhaMIGEMQ8wDQYDVQQEEwZFZ2dlcnQxDTALBgNVBCoT BExhcnMxFDASBgNVBAMTC0xhcnMgRWdnZXJ0MSgwJgYJKoZIhvcNAQkBFhlsYXJzLmVnZ2Vy dEBuZXRsYWIubmVjLmRlMSIwIAYJKoZIhvcNAQkBFhNsYXJzLmVnZ2VydEBnbXgubmV0MIIB IjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA1qbOfGavAbrtgyg5fXK2780qOs1rGU5E C6+czk6lDLP3lOzHKIb+uDuCMVlmBi32LIw0cVJZnR3SVG8k7VIdpR+Odg1AyQcl4nZS5kQ4 KIRtAFcM7XnastfoRN1ZwnaTIVBpLPup7a693SksTICzNADNZD1rB/ZVl+iDj3cTgt9IDD4k Oucx/T0e9G3n0C4BTynAL9MD/NtdJdOZ/HpMGAHKtnJt/4/p7g7tBxIeaYLJ2O3FRC3jSTg7 6+CIhNbd3NsOPtDXP1ia6hgjJfoGfHPuxbc46Mg3hLAozRQ3gNspjXftdDupI8Lzx5cz6961 u90Q0TwIzCePR15bnorqDQIDAQABo3cwdTAqBgUrZQEEAQQhMB8CAQAwGjAYAgEEBBNMMnVN eWZmQk5VYk5KSmNkWjJzMDkGA1UdEQQyMDCBGWxhcnMuZWdnZXJ0QG5ldGxhYi5uZWMuZGWB E2xhcnMuZWdnZXJ0QGdteC5uZXQwDAYDVR0TAQH/BAIwADANBgkqhkiG9w0BAQQFAAOBgQB4 K790kBQ+AEuJWOKCnCN4kx3HJRB22H4N1FG/M8wlLJfjiaM9J5nmxpji/rbzY+Rrwq1pzR+C 71S4fGQYRV5rO3iidWIh4GysE0Sttz/GOTQ4reYnKNGY6RVnnp1Fo92oxGzep+CvHTafgtG9 mqZ0q5RVVmOgbnGRSGKkNS3/dTGCAzswggM3AgEBMGkwYjELMAkGA1UEBhMCWkExJTAjBgNV BAoTHFRoYXd0ZSBDb25zdWx0aW5nIChQdHkpIEx0ZC4xLDAqBgNVBAMTI1RoYXd0ZSBQZXJz b25hbCBGcmVlbWFpbCBJc3N1aW5nIENBAgMLU6IwCQYFKw4DAhoFAKCCAacwGAYJKoZIhvcN AQkDMQsGCSqGSIb3DQEHATAcBgkqhkiG9w0BCQUxDxcNMDQwNDIyMTU1MDI1WjAjBgkqhkiG 9w0BCQQxFgQUZ3FMoZKq2VtDBJ2qnxKPkRWYqQgwUgYJKoZIhvcNAQkPMUUwQzAKBggqhkiG 9w0DBzAOBggqhkiG9w0DAgICAIAwDQYIKoZIhvcNAwICAUAwBwYFKw4DAgcwDQYIKoZIhvcN AwICASgweAYJKwYBBAGCNxAEMWswaTBiMQswCQYDVQQGEwJaQTElMCMGA1UEChMcVGhhd3Rl IENvbnN1bHRpbmcgKFB0eSkgTHRkLjEsMCoGA1UEAxMjVGhhd3RlIFBlcnNvbmFsIEZyZWVt YWlsIElzc3VpbmcgQ0ECAwtTojB6BgsqhkiG9w0BCRACCzFroGkwYjELMAkGA1UEBhMCWkEx JTAjBgNVBAoTHFRoYXd0ZSBDb25zdWx0aW5nIChQdHkpIEx0ZC4xLDAqBgNVBAMTI1RoYXd0 ZSBQZXJzb25hbCBGcmVlbWFpbCBJc3N1aW5nIENBAgMLU6IwDQYJKoZIhvcNAQEBBQAEggEA X8DiCAyvHHLYduaTKJQscgqKbhoy2h7UvIcqMemzc9PKI3Env+HdewgQKd+aS5go1cHSzSsO xMyW6wNuPrECGSScvaqKK2FiQDcKRRNjzFoYW8JpXXpEmspIAy29V7jwR4lInFRCkMKHm2oq PUJJ3igou4S9MMr+Tg8sYYwC+cZ2YxP237N6Ae3Adv2Fq4+hVa62YDDLY+4z0010fHwyAJSD jSIuJxKN8zekn3YfSl0OuRVn9Ft9kmjUG6XIJrWHfVswY1A99zNfZT/plkFH8KA4y40HTZo8 O+9GPskFVb+iEpk4S9J6+zzyfcvSfvl/peg9njJb8pluXvMEjuTq/QAAAAAAAA== --------------ms010204030507040308060501--