From mboxrd@z Thu Jan 1 00:00:00 1970 From: Grant Taylor Date: Tue, 25 May 2021 17:55:33 +0000 Subject: Re: Connection tracking debugging?! Message-Id: MIME-Version: 1 Content-Type: multipart/mixed; boundary="------------ms060806000701080808080903" List-Id: References: <20210525103639.GF3214@sv.lnf.it> In-Reply-To: <20210525103639.GF3214@sv.lnf.it> To: lartc@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms060806000701080808080903 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 5/25/21 4:36 AM, Marco Gaiarin wrote: > How can i 'debug' this issue? Thanks. I'd check the output of dmesg to see if you're exhausting the state=20 table. If you are, you'll see all sorts of messages from the kernel.=20 At least I did when I ran into this years ago. Adding memory addressed=20 the problem then. Short of that low hanging fruit I'd start with packet captures so that=20 you can watch the traffic flow. I occasionally see invalid traffic=20 after the flow should have been closed. It looks like your client may be sending TCP Reset packets. This could=20 be directly related to how different systems terminate a TCP connection. = -- Even if the clients agree, they may be doing something different=20 than the connection tracker helper expects, thus causing a subsequent=20 packet to be considered invalid after a shorter shutdown. --=20 Grant. . . . unix || die --------------ms060806000701080808080903 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCC CzkwggUhMIIECaADAgECAhA/wgXwQl9mDHSg5enGHBeSMA0GCSqGSIb3DQEBCwUAMIGWMQsw CQYDVQQGEwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxm b3JkMRgwFgYDVQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENs aWVudCBBdXRoZW50aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMB4XDTIwMTExNjAwMDAw MFoXDTIxMTExNjIzNTk1OVowKzEpMCcGCSqGSIb3DQEJARYaZ3RheWxvckB0bmV0Y29uc3Vs 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