Date: Sun, 20 Dec 2009 15:16:40 -0500 From: Jon Radel <jon@radel.com> To: DAve <dave.list@pixelhammer.com> Cc: 'User Questions' <freebsd-questions@freebsd.org> Subject: Re: Source of closed port RST responses Message-ID: <4B2E8628.6060100@radel.com> In-Reply-To: <4B2E7CEA.1020502@pixelhammer.com> References: <4B2E7CEA.1020502@pixelhammer.com>
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This is a cryptographically signed message in MIME format. --------------ms090505020603020208090108 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit DAve wrote: > I am routinely seeing these entries in one of my servers logs. > > Limiting closed port RST response from 373 to 200 packets/sec > > The server sits behind a PIX firewall, so I am suspicious of what is > trying to connect to a closed port. I don't see in any other logs what > port is being hit, or what IP is causing these log entries. > > Any way to tell what the source IP of these is? > > Thanks, > > DAve Easiest way, probably without any "observer effect," would be to mirror the switch port your server is plugged into and use a computer running wireshark, or equivalent, to look at the mirrored traffic. Unless, of course, your switch doesn't support port mirroring, you don't have a spare computer running wireshark, etc., etc. It's obviously hard to tell what resources you have available to you. You can also install wireshark from ports on your server, but depending on disk space, how "pristine" you want your server to remain, and internal security rules (wireshark, particularly some of the protocol decoders, is not without its own issues), there are some downsides to this. Also remember that source IPs can be forged, so look at the MAC address information as well if things appear to be really odd. -- --Jon Radel jon@radel.com --------------ms090505020603020208090108 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 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIJMTCC AvMwggJcoAMCAQICEB1eDeVYxhAO39zOEnHiAbwwDQYJKoZIhvcNAQEFBQAwYjELMAkGA1UE BhMCWkExJTAjBgNVBAoTHFRoYXd0ZSBDb25zdWx0aW5nIChQdHkpIEx0ZC4xLDAqBgNVBAMT I1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBJc3N1aW5nIENBMB4XDTA5MDIyNTA0MTMyNloX DTEwMDIyNTA0MTMyNlowXjEOMAwGA1UEBBMFUmFkZWwxEzARBgNVBCoTCkpvbiBUaG9tYXMx GTAXBgNVBAMTEEpvbiBUaG9tYXMgUmFkZWwxHDAaBgkqhkiG9w0BCQEWDWpvbkByYWRlbC5j b20wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDeT7qtj+euqWr2wXM7OnwrXJe9 Jlc0CGaM69AcTWOFakRY7MUXrqcmF5WjrqrMoagfGjS362eb6787x313ZdLoGuQPh/o2Mqp4 BbSgcnGZRj82SxkUmSN6+2q5ZOOYA6JmfvJwmBuRQ8sHki4GnoSwbIc11a70/z4at5qRi8bb /RtmJYewnpwXErfuuq0hhVSsYKFPXELzSahlpyC+lUfIdgvLJGxc7eU5QuvtYmuohNjn4k9C SJinvfjFbkvgbIgtvZxxmcE74NsKTeW2bEwgoCjZlcAD/QMgLE9KGSVn4/LzC/OZwkPKcWKO CPTNIZK1P+HxaIW4BvvYtjLu2Qx5AgMBAAGjKjAoMBgGA1UdEQQRMA+BDWpvbkByYWRlbC5j b20wDAYDVR0TAQH/BAIwADANBgkqhkiG9w0BAQUFAAOBgQBT+qFXV8sexrNOJuK8rhVpnCNF iFslD9Kelhon5Tt1tlTsw+B9F9B8ys9tfV559tzVqE+ULcqnjX2rsaJCwFmn6gyucCN0yGML h1O4ddsNQmoTOILyBCv/rkfO4tbXJM3si2JDNPZnL/0Rf3FpDTc3U3SnAdqE1a/8PGBTTmay VDCCAvMwggJcoAMCAQICEB1eDeVYxhAO39zOEnHiAbwwDQYJKoZIhvcNAQEFBQAwYjELMAkG A1UEBhMCWkExJTAjBgNVBAoTHFRoYXd0ZSBDb25zdWx0aW5nIChQdHkpIEx0ZC4xLDAqBgNV BAMTI1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBJc3N1aW5nIENBMB4XDTA5MDIyNTA0MTMy NloXDTEwMDIyNTA0MTMyNlowXjEOMAwGA1UEBBMFUmFkZWwxEzARBgNVBCoTCkpvbiBUaG9t YXMxGTAXBgNVBAMTEEpvbiBUaG9tYXMgUmFkZWwxHDAaBgkqhkiG9w0BCQEWDWpvbkByYWRl bC5jb20wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDeT7qtj+euqWr2wXM7Onwr XJe9Jlc0CGaM69AcTWOFakRY7MUXrqcmF5WjrqrMoagfGjS362eb6787x313ZdLoGuQPh/o2 Mqp4BbSgcnGZRj82SxkUmSN6+2q5ZOOYA6JmfvJwmBuRQ8sHki4GnoSwbIc11a70/z4at5qR i8bb/RtmJYewnpwXErfuuq0hhVSsYKFPXELzSahlpyC+lUfIdgvLJGxc7eU5QuvtYmuohNjn 4k9CSJinvfjFbkvgbIgtvZxxmcE74NsKTeW2bEwgoCjZlcAD/QMgLE9KGSVn4/LzC/OZwkPK cWKOCPTNIZK1P+HxaIW4BvvYtjLu2Qx5AgMBAAGjKjAoMBgGA1UdEQQRMA+BDWpvbkByYWRl bC5jb20wDAYDVR0TAQH/BAIwADANBgkqhkiG9w0BAQUFAAOBgQBT+qFXV8sexrNOJuK8rhVp nCNFiFslD9Kelhon5Tt1tlTsw+B9F9B8ys9tfV559tzVqE+ULcqnjX2rsaJCwFmn6gyucCN0 yGMLh1O4ddsNQmoTOILyBCv/rkfO4tbXJM3si2JDNPZnL/0Rf3FpDTc3U3SnAdqE1a/8PGBT TmayVDCCAz8wggKooAMCAQICAQ0wDQYJKoZIhvcNAQEFBQAwgdExCzAJBgNVBAYTAlpBMRUw EwYDVQQIEwxXZXN0ZXJuIENhcGUxEjAQBgNVBAcTCUNhcGUgVG93bjEaMBgGA1UEChMRVGhh d3RlIENvbnN1bHRpbmcxKDAmBgNVBAsTH0NlcnRpZmljYXRpb24gU2VydmljZXMgRGl2aXNp b24xJDAiBgNVBAMTG1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBDQTErMCkGCSqGSIb3DQEJ ARYccGVyc29uYWwtZnJlZW1haWxAdGhhd3RlLmNvbTAeFw0wMzA3MTcwMDAwMDBaFw0xMzA3 MTYyMzU5NTlaMGIxCzAJBgNVBAYTAlpBMSUwIwYDVQQKExxUaGF3dGUgQ29uc3VsdGluZyAo UHR5KSBMdGQuMSwwKgYDVQQDEyNUaGF3dGUgUGVyc29uYWwgRnJlZW1haWwgSXNzdWluZyBD QTCBnzANBgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEAxKY8VXNV+065yplaHmjAdQRwnd/p/6Me 7L3N9VvyGna9fww6YfK/Uc4B1OVQCjDXAmNaLIkVcI7dyfArhVqqP3FWy688Cwfn8R+RNiQq E88r1fOCdz0Dviv+uxg+B79AgAJk16emu59l0cUqVIUPSAR/p7bRPGEEQB5kGXJgt/sCAwEA AaOBlDCBkTASBgNVHRMBAf8ECDAGAQH/AgEAMEMGA1UdHwQ8MDowOKA2oDSGMmh0dHA6Ly9j cmwudGhhd3RlLmNvbS9UaGF3dGVQZXJzb25hbEZyZWVtYWlsQ0EuY3JsMAsGA1UdDwQEAwIB BjApBgNVHREEIjAgpB4wHDEaMBgGA1UEAxMRUHJpdmF0ZUxhYmVsMi0xMzgwDQYJKoZIhvcN AQEFBQADgYEASIzRUIPqCy7MDaNmrGcPf6+svsIXoUOWlJ1/TCG4+DYfqi2fNi/A9BxQIJNw PP2t4WFiw9k6GX6EsZkbAMUaC4J0niVQlGLH2ydxVyWN3amcOY6MIE9lX5Xa9/eH1sYITq72 6jTlEBpbNU1341YheILcIRk13iSx0x1G/11fZU8xggNkMIIDYAIBATB2MGIxCzAJBgNVBAYT AlpBMSUwIwYDVQQKExxUaGF3dGUgQ29uc3VsdGluZyAoUHR5KSBMdGQuMSwwKgYDVQQDEyNU aGF3dGUgUGVyc29uYWwgRnJlZW1haWwgSXNzdWluZyBDQQIQHV4N5VjGEA7f3M4SceIBvDAJ BgUrDgMCGgUAoIIBwzAYBgkqhkiG9w0BCQMxCwYJKoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEP Fw0wOTEyMjAyMDE2NDBaMCMGCSqGSIb3DQEJBDEWBBQPQIcRbeet16xyUUsBv8R0jRa54TBS BgkqhkiG9w0BCQ8xRTBDMAoGCCqGSIb3DQMHMA4GCCqGSIb3DQMCAgIAgDANBggqhkiG9w0D AgIBQDAHBgUrDgMCBzANBggqhkiG9w0DAgIBKDCBhQYJKwYBBAGCNxAEMXgwdjBiMQswCQYD VQQGEwJaQTElMCMGA1UEChMcVGhhd3RlIENvbnN1bHRpbmcgKFB0eSkgTHRkLjEsMCoGA1UE AxMjVGhhd3RlIFBlcnNvbmFsIEZyZWVtYWlsIElzc3VpbmcgQ0ECEB1eDeVYxhAO39zOEnHi AbwwgYcGCyqGSIb3DQEJEAILMXigdjBiMQswCQYDVQQGEwJaQTElMCMGA1UEChMcVGhhd3Rl IENvbnN1bHRpbmcgKFB0eSkgTHRkLjEsMCoGA1UEAxMjVGhhd3RlIFBlcnNvbmFsIEZyZWVt YWlsIElzc3VpbmcgQ0ECEB1eDeVYxhAO39zOEnHiAbwwDQYJKoZIhvcNAQEBBQAEggEArTk8 dTT04KQlO0UDYBgLbnwpdKtQPAV36I95m9orMY3AyLjpE2PpFzfnTW3MsOyI679bIwMegc3Z 6p2+45mMFy2pF0ow82J8w34xremk3IS6tPux6Vg+Bzw/6JY+Fh+VmNj42kjxoiYo2c8QVbrX 0NIu6flmxn8NXFMf3IaWOYPMOcW4V1q4VDzcMwVpQRSGWBuESqUT7SQ+nej1yFmI83rnlRz4 U1VJlZbDKKdG43wdm53pt96E6HQDHj8e7diNoNaB7gJHZHWAr22J8hqBGnuMzwMYkaiJ2K9t eBdTU1glubf7is1luA6olIOBDWuY2J1UlGKtX+gpT8jroIL/IgAAAAAAAA== --------------ms090505020603020208090108--
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