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    Problem with OpenVPN clients and routing?

    Scheduled Pinned Locked Moved 2.4 Development Snapshots
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    • C
      cosmoxl
      last edited by

      @johnpoz:

      "I've done which indicated high MTU sped up encrypt/decrypt"

      What??  Where did you read such a thing?

      Some time ago I came across an article on some testing done on high throughput openvpn.  I think this may have been it.  https://community.openvpn.net/openvpn/wiki/Gigabit_Networks_Linux

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      • johnpozJ
        johnpoz LAYER 8 Global Moderator
        last edited by

        "For a LAN-based setup this can work, but when handling various types of remote users (road warriors, cable modem users, etc) this is not always a possibility. "

        So this is a LAN based setup?

        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 24.11 | Lab VMs 2.8, 24.11

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        • C
          cosmoxl
          last edited by

          @johnpoz:

          "For a LAN-based setup this can work, but when handling various types of remote users (road warriors, cable modem users, etc) this is not always a possibility. "

          So this is a LAN based setup?

          no, but in the testing I've done I have seen some small improvement in performance with that setting.

          Anyway, this is getting off topic.  As I've tried to reiterate, this setting I've used for quite some time.  It doesn't cause the problem nor does its removal fix the problem.

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          • johnpozJ
            johnpoz LAYER 8 Global Moderator
            last edited by

            src 127.0.0.1 doesn't seem right..  Shouldn't the source be the be Your IP on this side of the tunnel..

            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
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            • C
              cosmoxl
              last edited by

              @johnpoz:

              src 127.0.0.1 doesn't seem right..  Shouldn't the source be the be Your IP on this side of the tunnel..

              That is from the command line of the firewall which has a NAT rule to access all VPN tunnels.  This should simulate what gateway monitoring does, right?

              The NAT outbound rules allow the firewall, 127.0.0.0/8, out to each VPN interface.

              Just for testing purposes I made all those NAT rules as "this firewall" out to each interface, instead of 127.0.0.0/8

              The same problem persists.

              As soon as I even enable the gateway (system_gateways.php) of another openvpn client (I didn't even start the tunnel), I'm suddenly unable to ping the other side of the VPN tunnel that's already up.

              ovpnc1: flags=8051 <up,pointopoint,running,multicast>metric 0 mtu 20000
                      options=80000 <linkstate>inet6 fe80::dacb:8aff:fe70:1374%ovpnc1 prefixlen 64 scopeid 0x7
                      inet 10.30.0.13 --> 10.30.0.1  netmask 0xffff0000
                      nd6 options=21 <performnud,auto_linklocal>groups: tun openvpn
                      Opened by PID 86920
              [2.4.0-BETA][removed]/root: ping 10.30.0.1
              PING 10.30.0.1 (10.30.0.1): 56 data bytes
              64 bytes from 10.30.0.1: icmp_seq=0 ttl=64 time=21.782 ms
              64 bytes from 10.30.0.1: icmp_seq=1 ttl=64 time=21.251 ms
              ^C
              --- 10.30.0.1 ping statistics ---
              2 packets transmitted, 2 packets received, 0.0% packet loss
              round-trip min/avg/max/stddev = 21.251/21.517/21.782/0.266 ms
              [2.4.0-BETA][removed]/root: ping 10.30.0.1
              PING 10.30.0.1 (10.30.0.1): 56 data bytes
              36 bytes from localhost (127.0.0.1): Time to live exceeded
              Vr HL TOS  Len   ID Flg  off TTL Pro  cks      Src      Dst
               4  5  00 0054 781b   0 0000  01  01 0000 127.0.0.1  10.30.0.1
              
              36 bytes from localhost (127.0.0.1): Time to live exceeded
              Vr HL TOS  Len   ID Flg  off TTL Pro  cks      Src      Dst
               4  5  00 0054 631d   0 0000  01  01 0000 127.0.0.1  10.30.0.1</performnud,auto_linklocal></linkstate></up,pointopoint,running,multicast> 
              
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              • C
                cosmoxl
                last edited by

                I went back to 2.3.4p1 and I have no more problems.  Also please remember I didn't have problems for several days on 2.4.  One of the 2.4 updates broke things.  I hope it can be found and fixed.

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                • jimpJ
                  jimp Rebel Alliance Developer Netgate
                  last edited by

                  You're the only person I've seen or heard of having trouble with multiple clients on 2.4 (or 2.3 for that matter).

                  I run several OpenVPN clients on 2.4 and they all work, 24/7, for weeks/months at a time.

                  It's something specific to your settings, either what you have configured or what is being pushed to you. It could be a conflicting or overlapping route or tunnel network, for example.

                  Remember: Upvote with the 👍 button for any user/post you find to be helpful, informative, or deserving of recognition!

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                  • C
                    cosmoxl
                    last edited by

                    @jimp:

                    You're the only person I've seen or heard of having trouble with multiple clients on 2.4 (or 2.3 for that matter).

                    I run several OpenVPN clients on 2.4 and they all work, 24/7, for weeks/months at a time.

                    It's something specific to your settings, either what you have configured or what is being pushed to you. It could be a conflicting or overlapping route or tunnel network, for example.

                    I tried to show in an earlier post that the routes don't overlap.  I don't specify remote networks in the OVPN client config either.  I do have OVPN clients set to not pull routes and to not add/remove routes.  That was how I was taught to do it and it works in pfsense 2.3.  But, maybe that doesn't work with pfsense 2.4 or openvpn 2.4?

                    I'm not sure how it's logical for anybody to say it's on my end when I change nothing and it stops working after an update.

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                    • jimpJ
                      jimp Rebel Alliance Developer Netgate
                      last edited by

                      Because nobody else can reproduce it and it affects only you, the logical conclusion is that it is something in your environment, config, etc.

                      Remember: Upvote with the 👍 button for any user/post you find to be helpful, informative, or deserving of recognition!

                      Need help fast? Netgate Global Support!

                      Do not Chat/PM for help!

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                      • C
                        cosmoxl
                        last edited by

                        @jimp:

                        Because nobody else can reproduce it and it affects only you, the logical conclusion is that it is something in your environment, config, etc.

                        What you're implying is that my pfsense config can be magically changed, not by me, so as to cause a problem.  That wouldn't be good business for netgate or for any users of pfsense.  Nor does it make sense for software developers who usually pride themselves on logic.

                        I understand it's difficult to see this as a problem if only 1 person is reporting it but let's try to remember the facts of the case.

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                        • jimpJ
                          jimp Rebel Alliance Developer Netgate
                          last edited by

                          Until the actual cause is located, however, the burden is still on you to diagnose it because nobody else can. I'm not saying your config magically changed, but something about it is causing the unintended behavior.

                          OpenVPN 2.4 also does a lot more dynamic negotiation, like NCP, where new settings are used in potentially unexpected ways depending on what the other side does.

                          So it may be that the provider(s) are sending you settings that do nothing in 2.3.x but activate things in 2.4.x which could be part of your issue.

                          There have not been any changes in OpenVPN code on pfSense in over a month, and the most recent change to OpenVPN itself was nearly two months ago (OpenVPN 2.4.3 on June 21).

                          Remember: Upvote with the 👍 button for any user/post you find to be helpful, informative, or deserving of recognition!

                          Need help fast? Netgate Global Support!

                          Do not Chat/PM for help!

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                          • C
                            cosmoxl
                            last edited by

                            Little more info.

                            As I'm using 2.3.4p1 now I see that when an openvpn client is stopped the routes (as seen in diag_routes.php) are removed as they should be.  In 2.4 betas they were not removed.

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