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    [SOLVED] Do not log TCP packets with flags TCP:RA / TCP:PA etc.

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    • johnpozJ
      johnpoz LAYER 8 Global Moderator @m0urs
      last edited by

      Same here, I have default deny logging off, and only log syn that hits my wan.. And then have another log rule for udp on ports that might be of interest..

      The net is pretty noisy place - trimming down the log to only interesting info keeps it a bit less noisy.

      An intelligent man is sometimes forced to be drunk to spend time with his fools
      If you get confused: Listen to the Music Play
      Please don't Chat/PM me for help, unless mod related
      SG-4860 24.03 | Lab VMs 2.7.2, 24.03

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      • M
        mcury @johnpoz
        last edited by mcury

        @johnpoz said in Do not log TCP packets with flags TCP:RA / TCP:PA etc.:

        Same here, I have default deny logging off, and only log syn that hits my wan.. And then have another log rule for udp on ports that might be of interest..

        The net is pretty noisy place - trimming down the log to only interesting info keeps it a bit less noisy.

        hmmm, interesting.. How I didn't think about this before ??!

        Edit:
        In my case, for both WANs, last 5 days, very little noise:

        NOT pf_tcp_flags:S AND source:filterlog[*]: AND (pf_interface:ix2 OR pf_interface:ix3) AND pf_ipv4_protocol:tcp
        2b09b979-7c21-4e9e-9caf-7fc379882fbc-image.png

        johnpozJ 1 Reply Last reply Reply Quote 0
        • johnpozJ
          johnpoz LAYER 8 Global Moderator @mcury
          last edited by

          @mcury said in Do not log TCP packets with flags TCP:RA / TCP:PA etc.:

          How I didn't think about this before ??!

          That is a good question, how long you been working with firewalls? @bmeeks has been in the field for many many a year ;) hehe And myself as well.. When you have to look at logs of this stuff, you look for ways to clean them up and only have stuff your interested in ;)

          An intelligent man is sometimes forced to be drunk to spend time with his fools
          If you get confused: Listen to the Music Play
          Please don't Chat/PM me for help, unless mod related
          SG-4860 24.03 | Lab VMs 2.7.2, 24.03

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          • M
            mcury @johnpoz
            last edited by

            That is a good question, how long you been working with firewalls? @bmeeks has been in the field for many many a year ;) hehe And myself as well.. When you have to look at logs of this stuff, you look for ways to clean them up and only have stuff your interested in ;)

            More than 10 years, I guess I'm used to suffer when checking logs 😆

            johnpozJ 1 Reply Last reply Reply Quote 0
            • johnpozJ
              johnpoz LAYER 8 Global Moderator @mcury
              last edited by

              @mcury 10 years - just a baby then, heheh that does look pretty quiet - that is just non Syn traffic looks like. What about UDP noise? You doing any filtering by source IP that your not logging?

              I block most if not all of the scanners, like shodan, etc. I also limit traffic by geoip on who can actually hit my port forwards.. Now I currently log all this traffic, if it is syn only..

              There are multiple was to reduce the noise that is logged..

              An intelligent man is sometimes forced to be drunk to spend time with his fools
              If you get confused: Listen to the Music Play
              Please don't Chat/PM me for help, unless mod related
              SG-4860 24.03 | Lab VMs 2.7.2, 24.03

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              • M
                mcury @johnpoz
                last edited by mcury

                @johnpoz said in Do not log TCP packets with flags TCP:RA / TCP:PA etc.:

                10 years - just a baby then

                Yeap, I started with Cisco routers and switches and around 15 years ago, and around 10 years ago it was just firewalls, Cisco ASA, Fortigate, Checkpoint, Palo Alto and Sonicwall, never looked back but we never forget the routing stuff =)

                @johnpoz said in Do not log TCP packets with flags TCP:RA / TCP:PA etc.:

                that is just non Syn traffic looks like.

                In the pic above, I was just filtering just TCP, but excluding SYN.. let me include UDP in it. Here it goes:

                095ff27d-9cb7-43c2-9b32-8d75490dd946-image.png

                @johnpoz said in Do not log TCP packets with flags TCP:RA / TCP:PA etc.:

                What about UDP noise? You doing any filtering by source IP that your not logging?

                Edit: Logging all TCP but TCP:S and all UDP traffic that hit both WANs, disabled packets that are blocked by the implicit default block rule.

                johnpozJ 1 Reply Last reply Reply Quote 0
                • johnpozJ
                  johnpoz LAYER 8 Global Moderator @mcury
                  last edited by

                  @mcury said in Do not log TCP packets with flags TCP:RA / TCP:PA etc.:

                  and all UDP traffic that hit both WANs

                  You might want to limit that to interesting ports if your goal is trim down the amount of noise your logging. My interesting ports is a pretty long list, but it does reduce some of the noise not logging every port ;)

                  An intelligent man is sometimes forced to be drunk to spend time with his fools
                  If you get confused: Listen to the Music Play
                  Please don't Chat/PM me for help, unless mod related
                  SG-4860 24.03 | Lab VMs 2.7.2, 24.03

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                  • M
                    mcury @johnpoz
                    last edited by

                    @johnpoz said in Do not log TCP packets with flags TCP:RA / TCP:PA etc.:

                    You might want to limit that to interesting ports if your goal is trim down the amount of noise your logging. My interesting ports is a pretty long list, but it does reduce some of the noise not logging every port ;)

                    I'll start preparing that list now.. =)

                    johnpozJ 1 Reply Last reply Reply Quote 0
                    • johnpozJ
                      johnpoz LAYER 8 Global Moderator @mcury
                      last edited by johnpoz

                      @mcury here is my list.. It prob way longer than need/should be but I had does some looking to what ports to put in there while back..

                      2:3 Entry added Thu, 17 Oct 2019 06:17:40 -0500
7 Entry added Thu, 17 Oct 2019 06:17:40 -0500
9 Entry added Thu, 17 Oct 2019 06:17:40 -0500
13 Entry added Thu, 17 Oct 2019 06:17:40 -0500
17 Entry added Thu, 17 Oct 2019 06:17:40 -0500
19:23 Entry added Thu, 17 Oct 2019 06:17:40 -0500
37:38 Entry added Thu, 17 Oct 2019 06:17:40 -0500
42 Entry added Thu, 17 Oct 2019 06:17:40 -0500
49 Entry added Thu, 17 Oct 2019 06:17:40 -0500
67:69 Entry added Thu, 17 Oct 2019 06:17:40 -0500
80 Entry added Thu, 17 Oct 2019 06:17:40 -0500
88 Entry added Thu, 17 Oct 2019 06:17:40 -0500
111:113 Entry added Thu, 17 Oct 2019 06:17:40 -0500
120 Entry added Thu, 17 Oct 2019 06:17:40 -0500
135:139 Entry added Thu, 17 Oct 2019 06:17:40 -0500
158 Entry added Thu, 17 Oct 2019 06:17:40 -0500
161:162 Entry added Thu, 17 Oct 2019 06:17:40 -0500
177 Entry added Thu, 17 Oct 2019 06:17:40 -0500
192 Entry added Thu, 17 Oct 2019 06:17:40 -0500
199 Entry added Thu, 17 Oct 2019 06:17:40 -0500
207 Entry added Thu, 17 Oct 2019 06:17:40 -0500
217 Entry added Thu, 17 Oct 2019 06:17:40 -0500
363 Entry added Thu, 17 Oct 2019 06:17:40 -0500
389 Entry added Thu, 17 Oct 2019 06:17:40 -0500
402 Entry added Thu, 17 Oct 2019 06:17:40 -0500
407 Entry added Thu, 17 Oct 2019 06:17:40 -0500
427 Entry added Thu, 17 Oct 2019 06:17:40 -0500
434 Entry added Thu, 17 Oct 2019 06:17:40 -0500
443 Entry added Thu, 17 Oct 2019 06:17:40 -0500
445 Entry added Thu, 17 Oct 2019 06:17:40 -0500
464 Entry added Thu, 17 Oct 2019 06:17:40 -0500
497 Entry added Thu, 17 Oct 2019 06:17:40 -0500
500 Entry added Thu, 17 Oct 2019 06:17:40 -0500
502 Entry added Thu, 17 Oct 2019 06:17:40 -0500
512:515 Entry added Thu, 17 Oct 2019 06:17:40 -0500
517:518 Entry added Thu, 17 Oct 2019 06:17:40 -0500
520 Entry added Thu, 17 Oct 2019 06:17:40 -0500
539 Entry added Thu, 17 Oct 2019 06:17:40 -0500
559 Entry added Thu, 17 Oct 2019 06:17:40 -0500
593 Entry added Thu, 17 Oct 2019 06:17:40 -0500
623 Entry added Thu, 17 Oct 2019 06:17:40 -0500
626 Entry added Thu, 17 Oct 2019 06:17:40 -0500
631 Entry added Thu, 17 Oct 2019 06:17:40 -0500
639 Entry added Thu, 17 Oct 2019 06:17:40 -0500
643 Entry added Thu, 17 Oct 2019 06:17:40 -0500
657 Entry added Thu, 17 Oct 2019 06:17:40 -0500
664 Entry added Thu, 17 Oct 2019 06:17:40 -0500
682:689 Entry added Thu, 17 Oct 2019 06:17:40 -0500
764 Entry added Thu, 17 Oct 2019 06:17:40 -0500
767 Entry added Thu, 17 Oct 2019 06:17:40 -0500
772:776 Entry added Thu, 17 Oct 2019 06:17:40 -0500
780:782 Entry added Thu, 17 Oct 2019 06:17:40 -0500
786 Entry added Thu, 17 Oct 2019 06:17:40 -0500
789 Entry added Thu, 17 Oct 2019 06:17:40 -0500
800 Entry added Thu, 17 Oct 2019 06:17:40 -0500
814 Entry added Thu, 17 Oct 2019 06:17:40 -0500
826 Entry added Thu, 17 Oct 2019 06:17:40 -0500
829 Entry added Thu, 17 Oct 2019 06:17:40 -0500
838 Entry added Thu, 17 Oct 2019 06:17:40 -0500
902:903 Entry added Thu, 17 Oct 2019 06:17:40 -0500
944 Entry added Thu, 17 Oct 2019 06:17:40 -0500
959 Entry added Thu, 17 Oct 2019 06:17:40 -0500
965 Entry added Thu, 17 Oct 2019 06:17:40 -0500
983 Entry added Thu, 17 Oct 2019 06:17:40 -0500
989:990 Entry added Thu, 17 Oct 2019 06:17:40 -0500
996:1001 Entry added Thu, 17 Oct 2019 06:17:40 -0500
1007:1008 Entry added Thu, 17 Oct 2019 06:17:40 -0500
1012:1014 Entry added Thu, 17 Oct 2019 06:17:40 -0500
1019:1051 Entry added Thu, 17 Oct 2019 06:17:40 -0500
1053:1060 Entry added Thu, 17 Oct 2019 06:17:40 -0500
53 Entry added Thu, 17 Oct 2019 12:07:49 -0500
123 Entry added Sat, 11 Apr 2020 02:33:04 -0500
33434 Odd port from pfsense forums

                      Wow from 2019, man time flies.. Doesn't seem like that long ago that I did that ;)

                      An intelligent man is sometimes forced to be drunk to spend time with his fools
                      If you get confused: Listen to the Music Play
                      Please don't Chat/PM me for help, unless mod related
                      SG-4860 24.03 | Lab VMs 2.7.2, 24.03

                      M 1 Reply Last reply Reply Quote 1
                      • m0ursM
                        m0urs @bmeeks
                        last edited by m0urs

                        @bmeeks
                        Unfortunately it seems not to work that way. I still get packets logged with these flags set:

                        c34ff848-a91c-4dac-b2c0-93681a5621eb-image.png

                        Do not get confused, I named my self created rule "Default blocking rule", but the ID is my own rule and not the pfSense default rule.

                        Here is the rule I created:

                        7bf8dc21-035c-46ff-9776-31373ad24ce9-image.png

                        93835a43-fd4b-44a4-9cb9-36b3b01363be-image.png

                        What am I doing wrong?

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                        • M
                          mcury @johnpoz
                          last edited by mcury

                          @johnpoz Wol, that is indeed a long list, I was thinking about ports:

                          7 WOL common used
9 WOL default
53 DNS
67:68 DHCP
80 QUIC
88 Kerberos
123 NTP
443 QUIC
500 IPsec
514 Syslog
1194:1198 Common OpenVPN ports..
4500 NAT-T
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                          • M
                            mcury @m0urs
                            last edited by

                            @m0urs said in Do not log TCP packets with flags TCP:RA / TCP:PA etc.:

                            What am I doing wrong?

                            Did you disable this ?

                            24112498-ef2f-4826-9425-2ac6a8912499-image.png

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                            • johnpozJ
                              johnpoz LAYER 8 Global Moderator @mcury
                              last edited by johnpoz

                              @mcury yeah its a bit long.. I went a bit overboard when was looking into ports that might be good to log.. I could prob trim it down.. But I really don't see much udp traffic even with that long list.

                              Yeah default deny logging is off

                              An intelligent man is sometimes forced to be drunk to spend time with his fools
                              If you get confused: Listen to the Music Play
                              Please don't Chat/PM me for help, unless mod related
                              SG-4860 24.03 | Lab VMs 2.7.2, 24.03

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                              • m0ursM
                                m0urs @mcury
                                last edited by

                                @mcury said in Do not log TCP packets with flags TCP:RA / TCP:PA etc.:

                                Did you disable this ?

                                Yes.

                                As I said: The logging comes from my own created rule and not from the pfSense default blocking rule.

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                                • M
                                  mcury @m0urs
                                  last edited by

                                  @m0urs said in Do not log TCP packets with flags TCP:RA / TCP:PA etc.:

                                  The logging comes from my own created rule and not from the pfSense default blocking rule.

                                  I'm trying to replicate this here, but now filtering TCP:S only, in my LAN networks.

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                                  • M
                                    mcury @mcury
                                    last edited by

                                    Are you using that "Invert match" option for source or destination in that rule ? So far, I'm unable to replicate this behavior here but I'm not using those options.

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                                    • m0ursM
                                      m0urs @mcury
                                      last edited by

                                      @mcury No, I do not use "Invert Match". That is my definition, together with that TCP Flags option mentioned above:

                                      5e3f4c21-62e3-46e7-a1c4-963fee7d2124-image.png

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                                      • m0ursM
                                        m0urs @mcury
                                        last edited by

                                        @mcury ah, maybe this does not work if protocol set to "Any"? I will try with Protocol set to "TCP" ...

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                                        • m0ursM
                                          m0urs @m0urs
                                          last edited by

                                          @mcury

                                          No, unfortunately that did not change anything. These kind of packets are still logged by that rule:

                                          70421b24-d1ae-41af-bf94-6343b09cd5ad-image.png

                                          You you explain me a bit more, what how this "TCP flag" setting is working? I still did not get it. What exactly is meant by "set" and "out of"?

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                                            mcury @m0urs
                                            last edited by

                                            @m0urs said in Do not log TCP packets with flags TCP:RA / TCP:PA etc.:

                                            What exactly is meant by "set" and "out of"?

                                            https://docs.netgate.com/pfsense/en/latest/firewall/configure.html#tcp-flags

                                            m0ursM 1 Reply Last reply Reply Quote 0
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