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    Issues with IPV6

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    • L
      louis2 @Gertjan
      last edited by louis2

      @gertjan

      This morning I noticed that the IPV6-gateway was gone again 😧 Stopping and starting the wan does ^fix^ the problem, but of course that is not OK.

      Since previous time this happened, I did setup a syslog server (graylog) in order to fetch all potential related alarms.

      In the logging I found three messages which draw my attention. when filtering the log using message ^like "ppp"^

      <12>1 2022-09-09T04:12:53.468066+02:00 pfSense.lan dpinger 76225 - - WAN_DHCP6 fe80::9217:3fff:fe7f:e4a1%pppoe1: Alarm latency 3558us stddev 4502us loss 22%

      Using the time as new selection criteria I selected the alarms occurring around this time. Starting and ending with an alarm which IMHO is not related. Here they are:

      <134>1 2022-09-09T04:12:35.879325+02:00 pfSense.lan filterlog 72340 - - 1316,,,1559467905,lagg0.13,match,pass,in,4,0x0,,1,64738,0,none,103,pim,46,192.168.13.1,224.0.0.13,datalength=26

      <12>1 2022-09-09T04:12:53.468066+02:00 pfSense.lan dpinger 76225 - - WAN_DHCP6 fe80::9217:3fff:fe7f:e4a1%pppoe1: Alarm latency 3558us stddev 4502us loss 22%

      <30>1 2022-09-09T04:12:53.474315+02:00 pfSense.lan rc.gateway_alarm 30961 - - >>> Gateway alarm: WAN_DHCP6 (Addr:fe80::9217:3fff:fe7f:e4a1%pppoe1 Alarm:1 RTT:3.558ms RTTsd:4.502ms Loss:22%)

      <13>1 2022-09-09T04:12:53.474964+02:00 pfSense.lan check_reload_status 391 - - updating dyndns WAN_DHCP6

      <13>1 2022-09-09T04:12:53.474990+02:00 pfSense.lan check_reload_status 391 - - Restarting OpenVPN tunnels/interfaces

      <13>1 2022-09-09T04:12:53.474983+02:00 pfSense.lan check_reload_status 391 - - Restarting IPsec tunnels

      <13>1 2022-09-09T04:12:53.474997+02:00 pfSense.lan check_reload_status 391 - - Reloading filter

      <30>1 2022-09-09T04:12:55.499322+02:00 pfSense.lan unbound 21401 - - [21401:3] info: 2a02:a468:c48e:11::f051 printer.lan. AAAA IN

      Note that I am a bit surprised to see messages related to OpenVPN as well .... since I am not using OpenVPN

      GertjanG 1 Reply Last reply Reply Quote 0
      • GertjanG
        Gertjan @louis2
        last edited by

        @louis2 said in Issues with IPV6:

        since I am not using OpenVPN

        And neither IPSEC, right ?

        When an interface event arrives, processes that use that interface are restarted.
        If OpenVPN, or IPSEC are not running, then that's ok. Nothing happens.
        You also saw "updating dyndns WAN_DHCP6" as it would be logical to do a DynDNS operation if the WAN_DHCP6 was used by the a Dyndns settings, the WAN IPv6 could have been changed, and the Dyndns (might) need an update.

        I don't know if dpinger triggers an interface event when the loss is 22 %, as 78 % of the v6 ping packets still made it back, so the IPv6 connection still working, but 'not for "100 %".

        Was it slowly degrading, dpinger wioll take action : a simple IPv6 interface restart (down and up) could correct the situation. Or not .... all depends why IPv6 went down (upstream).
        Your IPv6 was probably getting ok (long/some) time afterwards, but the immediate dpinger stop start on the interface didn't work out. It stays down, until far later on you restart it.

        My theory, of course.

        No "help me" PM's please. Use the forum, the community will thank you.
        Edit : and where are the logs ??

        L 1 Reply Last reply Reply Quote 0
        • L
          louis2 @Gertjan
          last edited by

          @gertjan

          I assume that Dyndns is related to a dynamic address, however .... I have a fixed IP{V4 address and a fixed IPV6-range.

          I can imagine .... that there was a maintenance action at the provider leading (not sure at all that that is what happend), however, that the situation does not recover ...... is not ok ....

          And yep simple interface restart ^fixes^ the issue ..... but that is not OK of course

          L 1 Reply Last reply Reply Quote 0
          • L
            louis2 @louis2
            last edited by louis2

            @gertjan

            Today the GUI again showed that the IPV6 was gone.

            6a0808ac-5042-4c79-9dd3-e3f088c124f1-image.png

            To test if the IPV6 was really gone, I did ping a couple of IPV6-addresses. And ..... I could reach them

            Pinging 2a00:1450:400e:801::200e with 32 bytes of data:
            Reply from 2a00:1450:400e:801::200e: time=4ms
            Reply from 2a00:1450:400e:801::200e: time=4ms
            Reply from 2a00:1450:400e:801::200e: time=4ms
            Reply from 2a00:1450:400e:801::200e: time=4ms

            Ping statistics for 2a00:1450:400e:801::200e:
            Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
            Approximate round trip times in milli-seconds:
            Minimum = 4ms, Maximum = 4ms, Average = 4ms

            So the conclusion seems to be that the gateway is available .... however that the GUI is not correctly updated ....

            GertjanG 1 Reply Last reply Reply Quote 0
            • GertjanG
              Gertjan @louis2
              last edited by

              @louis2 said in Issues with IPV6:

              So the conclusion seems to be that the gateway is available

              It should be the gateway.
              You've see many people people using (IPv4) 8.8.8.8 - ir 8.8.8.8 is not a gateway ;)

              Who are you pinging ?

              To find out 'for sure' : use

              grep ax | grep 'dpinger' and look at the command line used.

              No "help me" PM's please. Use the forum, the community will thank you.
              Edit : and where are the logs ??

              L 1 Reply Last reply Reply Quote 0
              • L
                louis2 @Gertjan
                last edited by

                @gertjan said in Issues with IPV6:

                grep ax | grep 'dpinger'

                [2.7.0-DEVELOPMENT][admin@pfSense.lan]/root: nslookup google.com
                Server: 127.0.0.1
                Address: 127.0.0.1#53

                Non-authoritative answer:
                Name: google.com
                Address: 142.251.39.110
                Name: google.com
                Address: 2a00:1450:400e:800::200e

                [2.7.0-DEVELOPMENT][admin@pfSense.lan]/root: ping6 2a00:1450:400e:800::200e
                PING6(56=40+8+8 bytes) 2a02:a468:c48e:1::1 --> 2a00:1450:400e:800::200e
                16 bytes from 2a00:1450:400e:800::200e, icmp_seq=0 hlim=61 time=6.048 ms
                16 bytes from 2a00:1450:400e:800::200e, icmp_seq=1 hlim=61 time=5.979 ms
                16 bytes from 2a00:1450:400e:800::200e, icmp_seq=2 hlim=61 time=5.980 ms
                16 bytes from 2a00:1450:400e:800::200e, icmp_seq=3 hlim=61 time=6.106 ms
                16 bytes from 2a00:1450:400e:800::200e, icmp_seq=4 hlim=61 time=5.989 ms
                16 bytes from 2a00:1450:400e:800::200e, icmp_seq=5 hlim=61 time=6.030 ms
                16 bytes from 2a00:1450:400e:800::200e, icmp_seq=6 hlim=61 time=6.032 ms
                16 bytes from 2a00:1450:400e:800::200e, icmp_seq=7 hlim=61 time=6.020 ms

                --- 2a00:1450:400e:800::200e ping6 statistics ---
                12 packets transmitted, 12 packets received, 0.0% packet loss
                round-trip min/avg/max/std-dev = 5.979/6.024/6.106/0.036 ms
                [2.7.0-DEVELOPMENT][admin@pfSense.lan]/root: grep ax | grep 'dpinger'
                ^C
                [2.7.0-DEVELOPMENT][admin@pfSense.lan]/root:

                GertjanG 1 Reply Last reply Reply Quote 0
                • GertjanG
                  Gertjan @louis2
                  last edited by

                  @louis2 said in Issues with IPV6:

                  grep ax | grep 'dpinger'

                  sorry,

                  ps ax | grep 'dpinger'

                  My IPv6 interface (he.net' :

                  78401 - Is 2:11.06 /usr/local/bin/dpinger -S -r 0 -i HENETV6_TUNNELV6 -B 2001:470:beef:5c0::2 -p /var/run/dpinger_HENETV6_TUNNELV6~2001:470:beef:5c0::2~2001:470:beef:5c0::1.pid -u /var/run/dpinger_HENETV6_TUNNELV6~2001:470:beef:5c0::2~2001:470:beef:5c0::1.sock -C /etc/rc.gateway_alarm -d 0 -s 500 -l 2000 -t 60000 -A 1000 -D 500 -L 20 2001:470:beef:5c0::1

                  where 2001:470:beef:5c0::1 is actually my IPv6 gateway

                  I can ping it - like dpinger :

                  [22.05-RELEASE][admin@pfSense.overhere.net]/root: ping6 2001:470:beef:5c0::1
                  PING6(56=40+8+8 bytes) 2001:470:beef:5c0::2 --> 2001:470:beef:5c0::1
                  16 bytes from 2001:470:beef:5c0::1, icmp_seq=0 hlim=64 time=45.301 ms
                  16 bytes from 2001:470:beef:5c0::1, icmp_seq=1 hlim=64 time=43.746 ms
                  16 bytes from 2001:470:beef:5c0::1, icmp_seq=2 hlim=64 time=44.482 ms
                  ^C

                  No "help me" PM's please. Use the forum, the community will thank you.
                  Edit : and where are the logs ??

                  L 1 Reply Last reply Reply Quote 0
                  • L
                    louis2 @Gertjan
                    last edited by

                    @gertjan

                    [2.7.0-DEVELOPMENT][admin@pfSense.lan]/root: ps ax | grep 'dpinger'
                    31465 - Is 0:09.22 /usr/local/bin/dpinger -S -r 0 -i WAN_PPPOE -B 77.174.abc.def -p /var/ru
                    31795 - Is 0:07.53 /usr/local/bin/dpinger -S -r 0 -i WAN_DHCP6 -B fe80::6a05:caff:fe5a:813d
                    88478 1 S+ 0:00.00 grep dpinger
                    [2.7.0-DEVELOPMENT][admin@pfSense.lan]/root:

                    1 Reply Last reply Reply Quote 0
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                    • L
                      louis2
                      last edited by

                      A couple of months past after I did create this topic. I hoped it would be solved in the FreeBSD14 release.

                      However, I am running 2.7 FreeBSD14 now ...... and the problem is still there 😧

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                      • B
                        blueuser @louis2
                        last edited by blueuser

                        @louis2 I had the same issue and these settings fixed it. Make sure DHCP6 is selected in 'IPv6 Configuration Type' and Gateway Monitoring is turned off for IPv6. Then release and renew WAN in Status->Interfaces.
                        screen1.png

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                        • L
                          louis2 @blueuser
                          last edited by

                          @blueuser

                          I do not fully understand the behavoir. But I was all ready trying take make a change, when I had some trouble and also a system crash. So I will perhaps try later.

                          However,

                          • turned off gateway monitoring for IPv6, seems a bad idea to me. And apart from that no idea where to find that setting
                          • my provider interface is ppoe based and some settings you are suggesting are strange in relation to ppoe
                          • I have a fixed /48 range
                          • when turning on advanced dhcp options, I noticed a field ^Prefix Interface^ really do not know what to imagine there. One of my many interfaces was listed there, no idea why that one. If there is something like a ^Prefix Interface^ what ever it may be, I would expect the WAN interface to have that functionallity
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                          • B
                            blueuser
                            last edited by blueuser

                            @louis2 You can find gateway monitoring in System->Routing->WAN_DHCP6 edit. You should do this for WAN_DHCP too just in case since it will prevent either interfaces from going down when you briefly lose a connection. For the prefix length keep /48 then. I still think it's worth trying all these settings, but also try them with and without 'Do not wait for a RA' enabled. If none of these work then maybe try changing some settings in your modem (bridge mode) and do a reboot on both devices.

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