Date: Thu, 23 Apr 2009 07:05:54 +0200 From: Sebastiaan van Erk <sebster@sebster.com> To: freebsd-pf@freebsd.org Subject: "BAD ICMP" message Message-ID: <49EFF732.3010402@sebster.com>
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This is a cryptographically signed message in MIME format. --------------ms020705040707080200060308 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hi, I have the following setup: [openvpn client 10.0.80.150] -> internet -> [vpn server 10.0.80.77] -> internet -> [openvpn client 10.0.80.4] The VPN server has 2 backups with CARP [.76, .75, shared IP .74] though I don't use the CARP failover for their role as VPN server but only for their role as gateway for the 10.0.80.0/24 network. For the VPN I use failover by specifying multiple "remote" lines to their respective external addresses in the openvpn client config. When I try a ssh from 10.0.80.150 to 10.0.80.4 I get to enter my password and sometimes even a few commands, but then pf suddenly starts blocking the connection with the following message: 1. 033789 rule 10/0(match): block in on em1: 10.0.80.150.51422 > 10.0.80.4.22: [|tcp] 2. 079427 rule 10/0(match): block in on em1: 10.0.80.150.51422 > 10.0.80.4.22: [|tcp] 4. 161413 rule 10/0(match): block in on em1: 10.0.80.150.51422 > 10.0.80.4.22: [|tcp] 8. 319210 rule 10/0(match): block in on em1: 10.0.80.150.51422 > 10.0.80.4.22: [|tcp] The 10 rule is the catch-all rule: @10 block drop log all I turned up the debug to load using pfctl -xl and I see these BAD ICMP messages just before the state of the above connection disappears from the state table and the connection gets blocked: Apr 23 06:58:38 vpn3 kernel: pf: loose state match: TCP 10.0.80.150:51422 10.0.80.150:51422 10.0.80.4:22 [lo=3150927679 high=3150923785 win=692 modulator=0] [lo=0 high=692 win=1 modulator=0] 2:0 A seq=3150927679 (3150927679) ack=0 len=0 ackskew=0 pkts=77:0 Apr 23 06:58:38 vpn3 kernel: pf: BAD ICMP 5:1 10.0.80.77 -> 10.0.80.150 state: TCP 10.0.80.4:22 10.0.80.4:22 10.0.80.150:51422 [lo=3150927679 high=3150923785 win=692 modulator=0] [lo=0 high=692 win=1 modulator=0] 2:0 seq=3150927679 I see this message several times and the connection no longer works after that. Does anybody know what's going on and how I can fix it? Many thanks, Sebastiaan van Erk --------------ms020705040707080200060308 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 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIJUTCC AwMwggJsoAMCAQICEFN8DarMNuuKJDEtfs0UaqUwDQYJKoZIhvcNAQEFBQAwYjELMAkGA1UE BhMCWkExJTAjBgNVBAoTHFRoYXd0ZSBDb25zdWx0aW5nIChQdHkpIEx0ZC4xLDAqBgNVBAMT I1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBJc3N1aW5nIENBMB4XDTA4MDYzMDEzNTE1N1oX DTA5MDYzMDEzNTE1N1owaDEQMA4GA1UEBBMHdmFuIEVyazETMBEGA1UEKhMKU2ViYXN0aWFh bjEbMBkGA1UEAxMSU2ViYXN0aWFhbiB2YW4gRXJrMSIwIAYJKoZIhvcNAQkBFhNzZWJzdGVy QHNlYnN0ZXIuY29tMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAsJDDAeYHVmH/ GVxi+bhFx27dmg++9BdhPJfk8k041sqEqq7oXnR2GT54quY3Ac7A1BuOM2JvoICraGmjud4y b3EanRnqGIK6iH+VAhhTlV/Owrb2Qm1e13DLxwLp1SocSQl4IrEbF9Y5H3ASdIrE0iFqkpju nPiiHeNhz3LaI5ipjiluKYoH+F6gPx8njHoaDxPePCkSLg4r0IA0afLM74LVZxCRBZEfyRZS J6VVUJefKlz91dWSzR/3xSw/rO4u9Ds/Zh7VBUKy3K+YFryHxRpUek0gSepE1b70Q39L9Sqd M/NZqMvFpwrqgW2Zh2Nh8nqRge90maR4ypBzz3GzLwIDAQABozAwLjAeBgNVHREEFzAVgRNz ZWJzdGVyQHNlYnN0ZXIuY29tMAwGA1UdEwEB/wQCMAAwDQYJKoZIhvcNAQEFBQADgYEAS1Sk NMgDVzb0ktO9tPPacV0KdKhTYOHcICVmuDEe2sFHOkjLAI1iAKp640pqJEVqvRnfRcCFJ9hK koPjjVZ+ui2rVmJWBG6FSloLRS/YYED4tUAw6DQhK61UOpjkpQxjCdm+5bHG/2ZgJAda1j0x uiN822+xFkcaW/5PQgxSRxcwggMDMIICbKADAgECAhBTfA2qzDbriiQxLX7NFGqlMA0GCSqG SIb3DQEBBQUAMGIxCzAJBgNVBAYTAlpBMSUwIwYDVQQKExxUaGF3dGUgQ29uc3VsdGluZyAo UHR5KSBMdGQuMSwwKgYDVQQDEyNUaGF3dGUgUGVyc29uYWwgRnJlZW1haWwgSXNzdWluZyBD QTAeFw0wODA2MzAxMzUxNTdaFw0wOTA2MzAxMzUxNTdaMGgxEDAOBgNVBAQTB3ZhbiBFcmsx EzARBgNVBCoTClNlYmFzdGlhYW4xGzAZBgNVBAMTElNlYmFzdGlhYW4gdmFuIEVyazEiMCAG CSqGSIb3DQEJARYTc2Vic3RlckBzZWJzdGVyLmNvbTCCASIwDQYJKoZIhvcNAQEBBQADggEP ADCCAQoCggEBALCQwwHmB1Zh/xlcYvm4Rcdu3ZoPvvQXYTyX5PJNONbKhKqu6F50dhk+eKrm NwHOwNQbjjNib6CAq2hpo7neMm9xGp0Z6hiCuoh/lQIYU5VfzsK29kJtXtdwy8cC6dUqHEkJ eCKxGxfWOR9wEnSKxNIhapKY7pz4oh3jYc9y2iOYqY4pbimKB/heoD8fJ4x6Gg8T3jwpEi4O K9CANGnyzO+C1WcQkQWRH8kWUielVVCXnypc/dXVks0f98UsP6zuLvQ7P2Ye1QVCstyvmBa8 h8UaVHpNIEnqRNW+9EN/S/UqnTPzWajLxacK6oFtmYdjYfJ6kYHvdJmkeMqQc89xsy8CAwEA AaMwMC4wHgYDVR0RBBcwFYETc2Vic3RlckBzZWJzdGVyLmNvbTAMBgNVHRMBAf8EAjAAMA0G CSqGSIb3DQEBBQUAA4GBAEtUpDTIA1c29JLTvbTz2nFdCnSoU2Dh3CAlZrgxHtrBRzpIywCN YgCqeuNKaiRFar0Z30XAhSfYSpKD441Wfrotq1ZiVgRuhUpaC0Uv2GBA+LVAMOg0ISutVDqY 5KUMYwnZvuWxxv9mYCQHWtY9MbojfNtvsRZHGlv+T0IMUkcXMIIDPzCCAqigAwIBAgIBDTAN BgkqhkiG9w0BAQUFADCB0TELMAkGA1UEBhMCWkExFTATBgNVBAgTDFdlc3Rlcm4gQ2FwZTES MBAGA1UEBxMJQ2FwZSBUb3duMRowGAYDVQQKExFUaGF3dGUgQ29uc3VsdGluZzEoMCYGA1UE CxMfQ2VydGlmaWNhdGlvbiBTZXJ2aWNlcyBEaXZpc2lvbjEkMCIGA1UEAxMbVGhhd3RlIFBl cnNvbmFsIEZyZWVtYWlsIENBMSswKQYJKoZIhvcNAQkBFhxwZXJzb25hbC1mcmVlbWFpbEB0 aGF3dGUuY29tMB4XDTAzMDcxNzAwMDAwMFoXDTEzMDcxNjIzNTk1OVowYjELMAkGA1UEBhMC WkExJTAjBgNVBAoTHFRoYXd0ZSBDb25zdWx0aW5nIChQdHkpIEx0ZC4xLDAqBgNVBAMTI1Ro YXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBJc3N1aW5nIENBMIGfMA0GCSqGSIb3DQEBAQUAA4GN ADCBiQKBgQDEpjxVc1X7TrnKmVoeaMB1BHCd3+n/ox7svc31W/Iadr1/DDph8r9RzgHU5VAK MNcCY1osiRVwjt3J8CuFWqo/cVbLrzwLB+fxH5E2JCoTzyvV84J3PQO+K/67GD4Hv0CAAmTX p6a7n2XRxSpUhQ9IBH+nttE8YQRAHmQZcmC3+wIDAQABo4GUMIGRMBIGA1UdEwEB/wQIMAYB Af8CAQAwQwYDVR0fBDwwOjA4oDagNIYyaHR0cDovL2NybC50aGF3dGUuY29tL1RoYXd0ZVBl cnNvbmFsRnJlZW1haWxDQS5jcmwwCwYDVR0PBAQDAgEGMCkGA1UdEQQiMCCkHjAcMRowGAYD VQQDExFQcml2YXRlTGFiZWwyLTEzODANBgkqhkiG9w0BAQUFAAOBgQBIjNFQg+oLLswNo2as Zw9/r6y+whehQ5aUnX9MIbj4Nh+qLZ82L8D0HFAgk3A8/a3hYWLD2ToZfoSxmRsAxRoLgnSe JVCUYsfbJ3FXJY3dqZw5jowgT2Vfldr394fWxghOrvbqNOUQGls1TXfjViF4gtwhGTXeJLHT HUb/XV9lTzGCA3EwggNtAgEBMHYwYjELMAkGA1UEBhMCWkExJTAjBgNVBAoTHFRoYXd0ZSBD b25zdWx0aW5nIChQdHkpIEx0ZC4xLDAqBgNVBAMTI1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFp bCBJc3N1aW5nIENBAhBTfA2qzDbriiQxLX7NFGqlMAkGBSsOAwIaBQCgggHQMBgGCSqGSIb3 DQEJAzELBgkqhkiG9w0BBwEwHAYJKoZIhvcNAQkFMQ8XDTA5MDQyMzA1MDU1NFowIwYJKoZI hvcNAQkEMRYEFMiD56fFHHPHY840Sd2QmzwqM0I/MF8GCSqGSIb3DQEJDzFSMFAwCwYJYIZI AWUDBAECMAoGCCqGSIb3DQMHMA4GCCqGSIb3DQMCAgIAgDANBggqhkiG9w0DAgIBQDAHBgUr DgMCBzANBggqhkiG9w0DAgIBKDCBhQYJKwYBBAGCNxAEMXgwdjBiMQswCQYDVQQGEwJaQTEl MCMGA1UEChMcVGhhd3RlIENvbnN1bHRpbmcgKFB0eSkgTHRkLjEsMCoGA1UEAxMjVGhhd3Rl IFBlcnNvbmFsIEZyZWVtYWlsIElzc3VpbmcgQ0ECEFN8DarMNuuKJDEtfs0UaqUwgYcGCyqG SIb3DQEJEAILMXigdjBiMQswCQYDVQQGEwJaQTElMCMGA1UEChMcVGhhd3RlIENvbnN1bHRp bmcgKFB0eSkgTHRkLjEsMCoGA1UEAxMjVGhhd3RlIFBlcnNvbmFsIEZyZWVtYWlsIElzc3Vp bmcgQ0ECEFN8DarMNuuKJDEtfs0UaqUwDQYJKoZIhvcNAQEBBQAEggEAZuz4AVm+dnjWa69H XvyNvZh9IwP7VS5XI0nCyIOKHes55eMtVsiWnDX+zXiQjNOu+C/W+Cg/dtIYR+bp1/o1zUDr 9LS1xhzELNJVWfm8P4eGoGeADmnncTARU2Q81DrgSO3EpqBtuAExicfaf7+DckmmaaIy8xFz Ye4VPDCeJ6L6mimFHqwZ6KwRqLV+mwVJOo6t5XmUDuUbctnLDA25e7M5XPvrK0HSUNaprmEs aDYq00mdVyyO4oDkgJJQ4ufWIguBgKjwIkX13tQqOTbtP2C/trAg8aIDjKJeecRVrfTQCWd5 GTj4XRhGHXA5s9n+hU4Xq8UqAnvTULfdq65UdwAAAAAAAA== --------------ms020705040707080200060308--
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