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    offloading OpenVPN using external gateway

    Routing and Multi WAN
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    • bingo600
      bingo600 @chrispazz last edited by

      @chrispazz

      So we have confirmed that the ICMP (ping) packages are actually being "policy routed" from 5.1 (pfSense) to 5.99 (RasPI)

      We don't see any Echo reply ... The issue is probably on the RasPI

      C 1 Reply Last reply Reply Quote 1
      • bingo600
        bingo600 last edited by

        On the Raspi (as root)

        What does a : sudo iptables -L show ?

        And this one ?
        92d9b6a4-89e6-402d-aeb5-c359a7092195-image.png

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        • C
          chrispazz @bingo600 last edited by

          This post is deleted!
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          • bingo600
            bingo600 last edited by

            Did you reboot the RasPI after enabling forwarding ?

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            • C
              chrispazz @bingo600 last edited by chrispazz

              @bingo600 yes, forward is activated.

              Chain INPUT (policy DROP)
              target prot opt source destination
              ACCEPT all -- anywhere anywhere
              ACCEPT icmp -- anywhere anywhere
              ACCEPT tcp -- anywhere anywhere tcp dpt:ssh
              ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED

              Chain FORWARD (policy DROP)
              target prot opt source destination
              ACCEPT all -- anywhere anywhere
              ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED

              Chain OUTPUT (policy ACCEPT)
              target prot opt source destination

              and yes, I rebooted it a lot of times :)

              bingo600 1 Reply Last reply Reply Quote 0
              • bingo600
                bingo600 @chrispazz last edited by

                @chrispazz

                Does this one give the expected result , should be your (OpenVPN public ip) ?

                wget http://ipinfo.io/ip -qO -

                Can you ping the google.it from the RasPI ?

                /Bingo

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                • C
                  chrispazz @bingo600 last edited by

                  @bingo600 said in offloading OpenVPN using external gateway:

                  wget http://ipinfo.io/ip -qO -

                  Both yes.
                  And if I test a traceroute from raspi I can confirm it is going outside using VPN connection....

                  bingo600 1 Reply Last reply Reply Quote 0
                  • bingo600
                    bingo600 @chrispazz last edited by bingo600

                    @chrispazz

                    Now : I would connect a PC directly to the RasPI , or directly to the ISP inside LAN , and set def-gw to the RasPI , and maybe DNS to 8.8.8.8

                    Then start debugging directly between the PC & The Raspi.

                    This can come in handy ... Disables all iptables stuff on the Raspi.
                    But only for this "boot sesion"

                    iptables -F
                    iptables -X
                    iptables -t nat -F
                    iptables -t nat -X
                    iptables -t mangle -F
                    iptables -t mangle -X
                    iptables -P INPUT ACCEPT
                    iptables -P FORWARD ACCEPT
                    iptables -P OUTPUT ACCEPT
                    
                    

                    I use these rules on my Deb10 machines , for OVPN to a VPN provider.

                    Remember to replace ens192 with the name of your ethernet interface on the Raspi.

                    # Default policy to drop all incoming packets
                    iptables -P INPUT DROP
                    iptables -P FORWARD DROP
                    
                    # Accept incoming packets from localhost and the LAN interface
                    iptables -A INPUT -i lo -j ACCEPT
                    iptables -A INPUT -i ens192 -j ACCEPT
                    
                    # Accept incoming packets from the WAN if the router initiated
                    # the connection
                    iptables -A INPUT -i tun0 -m conntrack \
                        --ctstate ESTABLISHED,RELATED -j ACCEPT
                    
                    # Forward LAN packets to the WAN
                    iptables -A FORWARD -i ens192 -o tun0 -j ACCEPT
                    
                    # Forward WAN packets to the LAN if the LAN initiated the
                    # connection
                    iptables -A FORWARD -i tun0 -o ens192 -m conntrack \
                        --ctstate ESTABLISHED,RELATED -j ACCEPT
                    
                    # NAT traffic going out the WAN interface
                    iptables -t nat -A POSTROUTING -o tun0 -j MASQUERADE
                    #
                    
                    
                    

                    Remember to save new rules if you change them

                    sudo systemctl enable netfilter-persistent
                    
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                    • C
                      chrispazz @bingo600 last edited by chrispazz

                      @bingo600 said in offloading OpenVPN using external gateway:

                      sudo systemctl enable netfilter-persistent

                      I made some other tests.

                      Raspberry is working good if I set a client to use it as network interface gateway and connection will go thru VPN (using my own iptables rules or yours).

                      So it seems that when I go thru pfsense, WAN main gateway (ISP router) is getting used instead of firewall rule gateway...

                      bingo600 1 Reply Last reply Reply Quote 0
                      • bingo600
                        bingo600 @chrispazz last edited by

                        @chrispazz said in offloading OpenVPN using external gateway:

                        @bingo600 said in offloading OpenVPN using external gateway:

                        sudo systemctl enable netfilter-persistent

                        I made some other tests.

                        Raspberry is working good if I set a client to use it as network interface gateway and connection will go thru VPN (using my own iptables rules or yours).

                        So it seems that when I go thru pfsense, WAN main gateway (ISP router) is getting used instead of firewall rule gateway...

                        That doesn't make sense
                        The packet trace you made doesn't lie.

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                        • bingo600
                          bingo600 last edited by

                          Now is the time to use tcpdump on the RasPI

                          https://kalitut.com/record-network-traffic-with-raspberry/

                          To see what it actually receives & forwards

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                          • C
                            chrispazz @bingo600 last edited by

                            @bingo600
                            This is traceroute from the client with the firewall rule applies:

                            traceroute to www.google.it (216.58.215.227), 64 hops max, 52 byte packets
                            1 192.168.5.254 (192.168.5.254) 2.370 ms 1.583 ms 1.516 ms

                            The first hop go to ISP gateway....I can't see Raspi here...

                            bingo600 1 Reply Last reply Reply Quote 0
                            • bingo600
                              bingo600 @chrispazz last edited by bingo600

                              @chrispazz
                              But that is not consistent with the packet trace you made on the pfSense

                              Can you do another trace , and then the traceroute ?

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                                chrispazz @bingo600 last edited by

                                @bingo600 if I try a trace to www.google.it IP address as host I get this:

                                18:25:31.846958 IP 192.168.5.1.4704 > 172.217.168.35.443: UDP, length 1350
                                18:25:31.883433 IP 172.217.168.35.443 > 192.168.5.1.4704: UDP, length 1350

                                so it is using 192.168.5.1 as gateway....

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                                • C
                                  chrispazz @chrispazz last edited by chrispazz

                                  @chrispazz Perhaps I understand the problem.

                                  My WAN interface is getting IP from ISP router (DHCP server on 192.168.5.0).
                                  The ISP gateway is getting on top of the firewall rule gateway....

                                  This is WAN if on pfsense:

                                  em1.90: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1492
                                  options=3<RXCSUM,TXCSUM>
                                  ether 02:11:32:25:4e:f9
                                  inet6 fe80::11:32ff:fe25:4ef9%em1.90 prefixlen 64 scopeid 0x8
                                  inet 192.168.5.1 netmask 0xffffff00 broadcast 192.168.5.255
                                  nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
                                  media: Ethernet autoselect (1000baseT <full-duplex>)
                                  status: active
                                  vlan: 90 vlanpcp: 0 parent interface: em1
                                  groups: vlan

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                                  • C
                                    chrispazz @chrispazz last edited by

                                    No wrong.

                                    192.168.5.1 is pfsense.... :(

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                                    • bingo600
                                      bingo600 @chrispazz last edited by

                                      @chrispazz said in offloading OpenVPN using external gateway:

                                      @bingo600 if I try a trace to www.google.it IP address as host I get this:

                                      18:25:31.846958 IP 192.168.5.1.4704 > 172.217.168.35.443: UDP, length 1350
                                      18:25:31.883433 IP 172.217.168.35.443 > 192.168.5.1.4704: UDP, length 1350

                                      so it is using 192.168.5.1 as gateway....

                                      Nope
                                      It's using 5.1 as source IP (Consistent with your WAN NAT)

                                      If you enable logging on the Policy rule , do you see any log lines ?

                                      Now you are not doing the traceroute on the pfSense box ... Are you ?

                                      What PC ip address are you doing the traceroute from , and are you 100% sure you have that ip in the OPENVPN Alias , and a policy route rule on the pfSense interface that that PC is connected to ?

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                                      • C
                                        chrispazz @bingo600 last edited by chrispazz

                                        @bingo600 said in offloading OpenVPN using external gateway:

                                        If you enable logging on the Policy rule , do you see any log lines ?

                                        Yes, it is the only rules that has logging

                                        Now you are not doing the traceroute on the pfSense box ... Are you ?

                                        No, I am doing it from iMac client (192.168.20.110)

                                        What PC ip address are you doing the traceroute from , and are you 100% sure you have that ip in the OPENVPN Alias , and a policy route rule on the pfSense interface that that PC is connected to ?

                                        I am using a firewall rule like this on the same interface of the client (192.168.20):

                                        2.jpg

                                        and NVPNGTW is the gateway I added to pfsense in the gateway section.

                                        bingo600 1 Reply Last reply Reply Quote 0
                                        • bingo600
                                          bingo600 @chrispazz last edited by

                                          @chrispazz said in offloading OpenVPN using external gateway:

                                          @bingo600 said in offloading OpenVPN using external gateway:

                                          If you enable logging on the Policy rule , do you see any log lines ?

                                          Yes, it is the only rules that has logging

                                          Now you are not doing the traceroute on the pfSense box ... Are you ?

                                          No, I am doing it from iMac client (192.168.20.110)

                                          What PC ip address are you doing the traceroute from , and are you 100% sure you have that ip in the OPENVPN Alias , and a policy route rule on the pfSense interface that that PC is connected to ?

                                          I am using a firewall rule like this on the same interface of the client (192.168.20):

                                          2.jpg

                                          and NVPNGTW is the gateway I added to pfsense in the gateway section.

                                          That's a (for me strange rule) why does it have WAN all the way to the right ?
                                          Are you using floating rules ?

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                                          • C
                                            chrispazz @bingo600 last edited by

                                            @bingo600 no no, sorry, it is only the description. Ignore it.

                                            bingo600 1 Reply Last reply Reply Quote 0
                                            • bingo600
                                              bingo600 @chrispazz last edited by

                                              @chrispazz

                                              Is that rule all the way at the top ?

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                                              • C
                                                chrispazz @bingo600 last edited by

                                                @bingo600 yes, sure

                                                bingo600 2 Replies Last reply Reply Quote 0
                                                • bingo600
                                                  bingo600 @chrispazz last edited by

                                                  @chrispazz
                                                  I have to pull in the tuff guyzz now.

                                                  @stephenw10
                                                  Any ideas here ??

                                                  1 Reply Last reply Reply Quote 1
                                                  • bingo600
                                                    bingo600 @chrispazz last edited by bingo600

                                                    @chrispazz

                                                    But just to summarize :

                                                    You say if you put a PC on the 192.168.5.x lan , and set 192.168.5.99 (RasPI) as def-gw , the PC can use the RasPI & OpenVPN tunnel ok ?

                                                    You have put all desired OPENVPN PC's in a IP HOST Alias
                                                    You made direct host entries in the rule, and made Policy based rules with the RasPI as Gateway , on all the interfaces where a "OPENVPN" PC could be connected ?

                                                    But the pfSense won't match the source ip's, and therefore won't policy route t the RasPI. This is also confirmed by , enabling logging in the Policy rule. And no loglines appear.

                                                    Q:
                                                    We did a trace (the first one above) , where we succesfully matched a ping to google.it , and you got both loglines , and we saw the policy routing in effect in the pfSense packet trace.

                                                    What has changed in the pfSense config since that ?

                                                    Was that test also made with the iMAC ?

                                                    Q:
                                                    You do use either static IP's or DHCP MAC Lock (Reservation) , in order to ensure that the PC's used for test & OPN always get the same ip ?.

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                                                    • C
                                                      chrispazz @bingo600 last edited by chrispazz

                                                      @bingo600 said in offloading OpenVPN using external gateway:

                                                      @chrispazz

                                                      But just to summarize :

                                                      You say if you put a PC on the 192.168.5.x lan , and set 192.168.5.99 (RasPI) as def-gw , the PC can use the RasPI & OpenVPN tunnel ok ?

                                                      Yes, correct.

                                                      You have put all desired OPENVPN PC's in a IP HOST Alias
                                                      You made direct host entries in the rule, and made Policy based rules with the RasPI as Gateway , on all the interfaces where a "OPENVPN" PC could be connected ?

                                                      Yes.

                                                      But the pfSense won't match the source ip's, and therefore won't policy route t the RasPI. This is also confirmed by , enabling logging in the Policy rule. And no loglines appear.

                                                      No. The rule is correctly engaged and it is logged in firewall log but it seems to ignore the Raspi used as gateway.

                                                      Q:
                                                      We did a trace (the first one above) , where we succesfully matched a ping to google.it , and you got both loglines , and we saw the policy routing in effect in the pfSense packet trace.

                                                      Currently, using 192.168.5.9 (Raspi gateway) as host, trace display the following when doing a ping to www.google.it:

                                                      19:32:03.251588 IP 192.168.5.1 > 192.168.5.9: ICMP echo request, id 43267, seq 26591, length 9
                                                      19:32:03.252028 IP 192.168.5.9 > 192.168.5.1: ICMP echo reply, id 43267, seq 26591, length 9

                                                      Doing packet trace using google IP as host gives the following:

                                                      19:33:38.627397 IP 192.168.5.1 > 172.217.168.3: ICMP echo request, id 10411, seq 0, length 64
                                                      19:33:38.642607 IP 172.217.168.3 > 192.168.5.1: ICMP echo reply, id 10411, seq 0, length 64

                                                      Was that test also made with the iMAC ?

                                                      The packet tracing is done pinging from Imac to www.google.it

                                                      Q:
                                                      You do use either static IP's or DHCP MAC Lock (Reservation) , in order to ensure that the PC's used for test & OPN always get the same ip ?.

                                                      I have IP reservation for iMac and static IP for Pfsense.

                                                      Just to give you more confirmation about the rule catched, consider that without that new rule, the connection has to go via the pfsense VPN client.
                                                      If I deactivate the rule, the connection go with pfsense VPN client. if I enable the rule, the connection exit with ISP gateway (no raspi VPN).

                                                      bingo600 1 Reply Last reply Reply Quote 0
                                                      • bingo600
                                                        bingo600 @chrispazz last edited by

                                                        @chrispazz said in offloading OpenVPN using external gateway:
                                                        packet trace.

                                                        Currently, using 192.168.5.9 (Raspi gateway) as host, trace display the following when doing a ping to www.google.it:

                                                        What does that mean ?
                                                        Currently, using 192.168.5.9 (Raspi gateway) as host

                                                        Wasnt the RasPI 192.168.5.99 ?

                                                        What does as host mean (you mean you ping the raspi) ?

                                                        The below 2 traces both show a req & a reply

                                                        19:32:03.251588 IP 192.168.5.1 > 192.168.5.9: ICMP echo request, id 43267, seq 26591, length 9
                                                        19:32:03.252028 IP 192.168.5.9 > 192.168.5.1: ICMP echo reply, id 43267, seq 26591, length 9

                                                        Doing packet trace using google IP as host gives the following:

                                                        19:33:38.627397 IP 192.168.5.1 > 172.217.168.3: ICMP echo request, id 10411, seq 0, length 64
                                                        19:33:38.642607 IP 172.217.168.3 > 192.168.5.1: ICMP echo reply, id 10411, seq 0, length 64

                                                        In the Packet capture try to set detail to high or full

                                                        2cedcbc3-da8f-40b9-92a1-e384cc29ec8f-image.png

                                                        We need to see the mac addresses in those packets.

                                                        And compare to the RasPI mac address

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                                                        • C
                                                          chrispazz @bingo600 last edited by

                                                          @bingo600 said in offloading OpenVPN using external gateway:

                                                          What does as host mean (you mean you ping the raspi) ?

                                                          HOST is the captured Host address

                                                          We need to see the mac addresses in those packets.

                                                          b8:27:eb:8e:00:43 is Raspi MAC Address
                                                          02:11:32:25:4e:f9 is pfsense WAN interface

                                                          Full detailed trace is the following:

                                                          192.168.5.1 > 192.168.5.99: ICMP echo request, id 43267, seq 28884, length 9
                                                          19:51:42.213831 b8:27:eb:8e:00:43 > 02:11:32:25:4e:f9, ethertype IPv4 (0x0800), length 60: (tos 0x0, ttl 64, id 59852, offset 0, flags [none], proto ICMP (1), length 29)
                                                          192.168.5.99 > 192.168.5.1: ICMP echo reply, id 43267, seq 28884, length 9
                                                          19:51:42.723672 02:11:32:25:4e:f9 > b8:27:eb:8e:00:43, ethertype IPv4 (0x0800), length 43: (tos 0x0, ttl 64, id 65165, offset 0, flags [none], proto ICMP (1), length 29)

                                                          bingo600 2 Replies Last reply Reply Quote 0
                                                          • bingo600
                                                            bingo600 @chrispazz last edited by bingo600

                                                            @chrispazz

                                                            Now do the same trace with the google ip as the destination

                                                            Your iMAC isn't multihomed ?
                                                            I mean both cable & WiFi

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                                                            • C
                                                              chrispazz @bingo600 last edited by chrispazz

                                                              @bingo600 here it is:

                                                              192.168.5.1 > 216.58.215.227: ICMP echo request, id 61288, seq 0, length 64
                                                              20:09:20.262578 dc:39:6f:f2:4d:e4 > 02:11:32:25:4e:f9, ethertype IPv4 (0x0800), length 98: (tos 0x60, ttl 113, id 0, offset 0, flags [none], proto ICMP (1), length 84)
                                                              216.58.215.227 > 192.168.5.1: ICMP echo reply, id 61288, seq 0, length 64
                                                              20:09:21.238644 02:11:32:25:4e:f9 > dc:39:6f:f2:4d:e4, ethertype IPv4 (0x0800), length 98: (tos 0x0, ttl 64, id 58651, offset 0, flags [none], proto ICMP (1), length 84)

                                                              Trying to understand who is dc:39:6f:f2:4d:e4....

                                                              Currently iMac is connected only with wifi so no multiple ip

                                                              bingo600 1 Reply Last reply Reply Quote 0
                                                              • bingo600
                                                                bingo600 @chrispazz last edited by

                                                                @chrispazz said in offloading OpenVPN using external gateway:

                                                                Trying to understand who is dc:39:6f:f2:4d:e4....

                                                                My money is on the ISP router 5.254

                                                                pfSense Diagnostic -> arp table will reveal

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                                                                  chrispazz @bingo600 last edited by

                                                                  @bingo600 you are right!

                                                                  bingo600 1 Reply Last reply Reply Quote 0
                                                                  • bingo600
                                                                    bingo600 @chrispazz last edited by

                                                                    @chrispazz

                                                                    In the capture , strange it matched ....
                                                                    didn't you set 192.168.5.99 as ip match ?

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                                                                      chrispazz @bingo600 last edited by

                                                                      @bingo600 latest try was with google IP as you asked....am I wrong?

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                                                                      • bingo600
                                                                        bingo600 @chrispazz last edited by

                                                                        @chrispazz said in offloading OpenVPN using external gateway:

                                                                        @bingo600 said in offloading OpenVPN using external gateway:

                                                                        What does as host mean (you mean you ping the raspi) ?

                                                                        HOST is the captured Host address

                                                                        We need to see the mac addresses in those packets.

                                                                        b8:27:eb:8e:00:43 is Raspi MAC Address
                                                                        02:11:32:25:4e:f9 is pfsense WAN interface

                                                                        Full detailed trace is the following:

                                                                        192.168.5.1 > 192.168.5.99: ICMP echo request, id 43267, seq 28884, length 9
                                                                        19:51:42.213831 b8:27:eb:8e:00:43 > 02:11:32:25:4e:f9, ethertype IPv4 (0x0800), length 60: (tos 0x0, ttl 64, id 59852, offset 0, flags [none], proto ICMP (1), length 29)
                                                                        192.168.5.99 > 192.168.5.1: ICMP echo reply, id 43267, seq 28884, length 9
                                                                        19:51:42.723672 02:11:32:25:4e:f9 > b8:27:eb:8e:00:43, ethertype IPv4 (0x0800), length 43: (tos 0x0, ttl 64, id 65165, offset 0, flags [none], proto ICMP (1), length 29)

                                                                        What command did you use on the iMAC to make this trace , where it goes to the Raspi (but raspi as destination)

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                                                                        • C
                                                                          chrispazz @bingo600 last edited by

                                                                          @bingo600 only "ping www.google.it".

                                                                          But in first trace I used the raspi as Host capture.

                                                                          C bingo600 2 Replies Last reply Reply Quote 0
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                                                                            chrispazz @chrispazz last edited by chrispazz

                                                                            Ok this is interesting:

                                                                            I added a floating rule with no filters but "out" direction and in advanced settings with the Raspi Gateway.

                                                                            With this, the connection go correctly thru the Raspi VPN.

                                                                            So, the external gateway thur pfsense is working correctly.
                                                                            I have to understand why when using a firewall rule in a specific interface is not using Raspi gateway

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                                                                            • bingo600
                                                                              bingo600 @chrispazz last edited by bingo600

                                                                              @chrispazz
                                                                              I don't think the first capture is showing the : ping www.google.it
                                                                              I think something is pinging the Raspi ... And it's prob the gw-monitor.
                                                                              I was fooled there

                                                                              It was my mistake concluding the policy route was working, in the first trace we saw.

                                                                              A working policy route package would be like the last one you made (google ip)
                                                                              but with the RasPI MAC instead of the ISP-Router MAC

                                                                              So at the moment pfSense policy routing is NOT working as intended

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                                                                                chrispazz @bingo600 last edited by chrispazz

                                                                                @bingo600 Yes but the rules is matched because it is logged in the pfsense firewall log.
                                                                                It only is ignoring the gateway in advanced settings....
                                                                                The same rule in "floating" mode is working...

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                                                                                  chrispazz @chrispazz last edited by

                                                                                  This is really strange, now again the floating rule is not working.
                                                                                  I will try to reboot pfsense....

                                                                                  bingo600 1 Reply Last reply Reply Quote 0
                                                                                  • bingo600
                                                                                    bingo600 @chrispazz last edited by

                                                                                    @chrispazz said in offloading OpenVPN using external gateway:

                                                                                    This is really strange, now again the floating rule is not working.
                                                                                    I will try to reboot pfsense....

                                                                                    Noooooo
                                                                                    Don't say you're using floating rules , i asked about that

                                                                                    C 1 Reply Last reply Reply Quote 0
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