Date: Wed, 19 Feb 2003 09:37:23 -0800 From: Lars Eggert <larse@ISI.EDU> To: Audsin <dev.dhas@kcl.ac.uk> Cc: freebsd-hackers@freebsd.org Subject: Re: Packet length 1284 instead of 1280 Message-ID: <3E53C0D3.70203@isi.edu> In-Reply-To: <5.2.0.9.0.20030219133537.070e0c78@pop2.kcl.ac.uk> References: <5.2.0.9.0.20030219133537.070e0c78@pop2.kcl.ac.uk>
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This is a cryptographically signed message in MIME format. --------------ms050303050801000800070503 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Audsin wrote: > Sir / Madam > > I am doing my research on fragmentation avoidance technique for mip6. I > am using FreeBSD4.4 with kame snap and ethereal to capture packets > > I have a query regarding the packet length > > If i am correct , > packet length = IPHdr +extHdr+TCPHdr+TCPOpt+Data > > =IPHdr+Routing Header + Frag Header + TCP Header+ > Tcpopt+ Data > > 40+24+8+20+12+1176=1280 (Which is the MTU of > the gif0 interface) > > But my ethereal capture says the packet length to be 1284 btyes. Can > anyone please let me know what that 4 bytes is accounted for? Can't help you with your question, but if you're using 4.4-RELEASE, the KAME -SNAP you're using must be ancient. There have been many fixes, especially to the MIP6 code, so upgrading to a recent -SNAP may simply make the problem go away. Lars -- Lars Eggert <larse@isi.edu> USC Information Sciences Institute --------------ms050303050801000800070503 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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