Date: Thu, 08 Jun 2006 17:26:57 -0500 From: Paul Schmehl <pauls@utdallas.edu> Cc: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: Tcpdump dropping packets Message-ID: <4488A431.5070306@utdallas.edu> In-Reply-To: <44876F3C.9020409@mac.com> References: <4487245C.6070807@utdallas.edu> <44876F3C.9020409@mac.com>
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This is a cryptographically signed message in MIME format. --------------ms010008050300070505060000 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Chuck Swiger wrote: > > Check sysctl debug.bpf_bufsize, but also do a search on this because > there may be a patch needed for PCAP in order for buffers larger than > 32K to actually work. [1] > Hmmm.... sysctl debug.bpf_bufsize sysctl: unknown oid 'debug.bpf_bufsize' sysctl -a | grep bufsize net.bpf.maxbufsize: 524288 net.bpf.bufsize: 4096 I assume bufsize is the default? And maxbufsize is as high as it can go? So it defaults to 4 megs and maxes out at 512 megs? If true, how would I go about calculating a sufficiently large maxbufsize? If I have approximate 150Mbps traffic, how much has to be held in the buffer? -- Paul Schmehl (pauls@utdallas.edu) Adjunct Information Security Officer The University of Texas at Dallas http://www.utdallas.edu/ir/security/ --------------ms010008050300070505060000 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 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIOyjCC A9gwggNBoAMCAQICEEHsHz2nFAeWxPbVDN3RD2UwDQYJKoZIhvcNAQEFBQAwgcExCzAJBgNV BAYTAlVTMRcwFQYDVQQKEw5WZXJpU2lnbiwgSW5jLjE8MDoGA1UECxMzQ2xhc3MgMiBQdWJs aWMgUHJpbWFyeSBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0eSAtIEcyMTowOAYDVQQLEzEoYykg MTk5OCBWZXJpU2lnbiwgSW5jLiAtIEZvciBhdXRob3JpemVkIHVzZSBvbmx5MR8wHQYDVQQL ExZWZXJpU2lnbiBUcnVzdCBOZXR3b3JrMB4XDTk5MDMzMTAwMDAwMFoXDTA5MDMzMDIzNTk1 OVowgeoxJzAlBgNVBAoTHlRoZSBVbml2ZXJzaXR5IG9mIFRleGFzIFN5c3RlbTEfMB0GA1UE 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