IPSEC VTI Tunnels



  • @jimp the warning is with the patch applied. The error was there before as well, just showing the /30 subnet and the corresponding remote tunnel ip.

    I have not tested the pfsense-Linux ipsec tunnel after the pfsense patch. Will get to it tomorrow and update here.



  • @turbulence said in IPSEC VTI Tunnels:

    Hi Jim,

    Long time pfSense user here.

    Thought I would sign up to the forum to contribute to this. I have just installed patch 0_1538745996158_ipsec-vti-0.0.0.0.diff and setup a VTI between the pfSense and an EdgeRouter 4 (running the latest firmware) and I can report that the VPN is now working correctly. I'll let you know if I come across any subsequent strange behaviors, but everything is looking good so far.

    Mind sharing your configuration?
    I am trying to get IPSec VTI running between PfSense and EdgeRouter X but i'm not able to get it working. (I already applied latest patch)
    alt text
    alt text
    alt text

    Logging:

    Oct 12 09:11:40	charon		12[KNL] creating acquire job for policy X.X.X.X/32|/0 === X.X.X.X/32|/0 with reqid {0}
    Oct 12 09:11:40	charon		12[KNL] received an SADB_ACQUIRE with policy id 8936 but no matching policy found
    Oct 12 09:11:38	charon		06[CFG] vici client 148 disconnected
    Oct 12 09:11:38	charon		16[CFG] vici client 148 requests: list-sas
    Oct 12 09:11:38	charon		16[CFG] vici client 148 registered for: list-sa
    Oct 12 09:11:38	charon		08[CFG] vici client 148 connected
    


  • Sure thing.

    Here's the ER4 config to start with. BTW, you need to be using IKEV2.

    ==PEER CONFIG==
    show vpn ipsec site-to-site peer X.X.X.X
    authentication {
    mode pre-shared-secret
    pre-shared-secret SECRETGOESHERE
    }
    connection-type initiate
    description TUNNEL-NAME-HERE
    ike-group FOO4
    ikev2-reauth yes
    local-address Y.Y.Y.Y
    vti {
    bind vti4
    esp-group FOO4
    }

    ==ESP CONFIG==
    show vpn ipsec esp-group FOO4
    compression disable
    lifetime 28800
    mode tunnel
    pfs dh-group14
    proposal 1 {
    encryption aes256
    hash sha256
    }

    ==IKE CONFIG==
    show vpn ipsec ike-group FOO4
    ikev2-reauth yes
    key-exchange ikev2
    lifetime 28800
    proposal 1 {
    dh-group 14
    encryption aes256
    hash sha256
    }

    ==VTI CONFIG==
    show interfaces vti vti4
    address 10.10.202.2/30
    mtu 1436

    ==ROUTE CONFIG==
    show protocols static interface-route 172.24.16.0/24
    next-hop-interface vti4 {
    description TUNNEL-NAME-HERE
    }



  • And here's the PFSense configuration.

    Let me know if you need any further assistance!

    2_1539329677025_Routes.PNG 1_1539329677024_Phase2.png 0_1539329677024_Phase1.png



  • @turbulence said in IPSEC VTI Tunnels:

    And here's the PFSense configuration.

    Let me know if you need any further assistance!

    Thank you for the information. Will try it out later today and report back.



  • @turbulence said in IPSEC VTI Tunnels:

    And here's the PFSense configuration.

    Let me know if you need any further assistance!

    Ok, I tried to do it with IKEv2 and instead of Type 'Network' on Remote Network in PfSense Phase 2 setting, I used Type 'Address'.

    With those settings the tunnel will come online. But I'm still not able to pass traffic.
    What I found out is the following:
    When I start a packetdump on PfSense I see ICMP traffic. (192.168.111.1 --> 192.168.111.2)
    On EdgeRouter X side I see the ICMP messages arrive and the router also responds, but the response packets never reach the IPSEC1000 interface on the PfSense.

    PfSense
    alt text

    EdgeRouter
    alt text



  • Hello Everyone,
    I got vti setup working between pfsense and edgerouter pro with ebgp in place . Patch for 0.0.0.0/0 is required.

    0_1539434435515_vti_pfsense.png

    key point was Address in phase 2 and on edge router firewall allow BGP in VPN zone. VPN configuration on edge router is standard vti setup.

    Phase 2

    0_1539435267226_vti_phase2.png

    The only one think is that tunnel goes down time to time. In logs I see

    Oct 13 08:48:58 php-fpm 35862 /rc.newipsecdns: Gateway, none 'available' for inet6, use the first one configured. ''
    Oct 13 08:48:58 php-fpm 35862 /rc.newipsecdns: The command '/sbin/ifconfig 'ipsec3000' create reqid '3000'' returned exit code '1', the output was 'ifconfig: create: bad value'
    Oct 13 08:48:57 check_reload_status Reloading filter
    Oct 13 08:48:57 php-fpm 35862 /rc.newipsecdns: IPSEC: One or more IPsec tunnel endpoints has changed its IP. Refreshing.
    Oct 13 08:48:42 php-fpm 61417 /rc.openvpn: Gateway, none 'available' for inet6, use the first one configured. ''
    Oct 13 08:48:41 check_reload_status Reloading filter



  • My problem is solved. On the other side (EdgeRouter side) I use Dual-WAN with LB. I'm migrating this tunnel from VyOS to PfSense. The PfSense public IP was being loadbalanced. This caused the IPSec traffic to go over the wrong outside interface. After adding the public IP to the LB Exclude list, things started working.

    Now I am running into another (NAT) problem. Maybe one of you can test if you get the same result. If I add an NAT rule to masquerade traffic with IP-address of VTI interface I am not able to reach anything on the EdgeRouter side.

    What I am doing to test:
    Ping from PfSense CLI to 192.168.111.2 (EdgeRouter). This works without the NAT rule. When I enable the NAT rule it stops working.

    So far my observations are:
    Traffic is leaving IPsec1000 interface on PfSense with correct NAT address (192.168.111.1). Traffic arrives on interface EdgeRouter and EdgeRouter sends traffic back which also arrives back at the IPsec1000 interface. But PfSense never gets reply on ICMP-echo request.

    NAT rule looks like this. (Interface is VTI interface)
    alt text

    @turbulence



  • I am watching tunnel and it not 100% stable. Sometimes pfsense stop reply to traffic from vpn tunnel. I see traffic arrive on vti interface, but never send reply.


  • Rebel Alliance Developer Netgate

    @bluray said in IPSEC VTI Tunnels:

    Now I am running into another (NAT) problem. Maybe one of you can test if you get the same result. If I add an NAT rule to masquerade traffic with IP-address of VTI interface I am not able to reach anything on the EdgeRouter side.

    That's a known issue, NAT doesn't work with VTI currently. There is some weirdness between if_ipsec/VTI and pf where the traffic hits both the ipsecX interface and enc0. You might try putting the NAT rule on the "IPsec" interface in the GUI and not the assigned VTI interface.



  • @jimp said in IPSEC VTI Tunnels:

    @bluray said in IPSEC VTI Tunnels:

    Now I am running into another (NAT) problem. Maybe one of you can test if you get the same result. If I add an NAT rule to masquerade traffic with IP-address of VTI interface I am not able to reach anything on the EdgeRouter side.

    That's a known issue, NAT doesn't work with VTI currently. There is some weirdness between if_ipsec/VTI and pf where the traffic hits both the ipsecX interface and enc0. You might try putting the NAT rule on the "IPsec" interface in the GUI and not the assigned VTI interface.

    Hello Jim,

    Thank you for your feedback.
    Unfortunately that doesn't work in my case. Is there a bugreport for this so I can track this issue? If not how can I make one?


  • Rebel Alliance Developer Netgate

    I don't recall if I made an issue for it on Redmine, but it's not one that we can address. It will need to be taken upstream to FreeBSD directly.



  • I already searched in Redmine, but I couldn't find one. Your explanation explains why there is no. (Due to it being a bug in FreeBSD IPSec implementation which must be fixed by FreeBSD Developers)

    I'm not familiair with reporting bugs. Will do some research how to submit one. Hopefully this can be resolved in the future.



  • Bumping this because I'm experiencing a similar problem.

    I have 2 IPsec Tunnels to an ISP.

    IPSec Phase 1 works good. When Phase 2 would come up for a short period of time, then fail. and the whole tunnel would collapse and restart.

    I observed a bunch of logs stating

    Nov 19 19:40:41	charon		14[KNL] <con2000|3> querying policy 10.0.255.248/30|/0 === 10.0.255.248/30|/0 in failed, not found
    Nov 19 19:40:41	charon		14[KNL] <con2000|3> querying policy 10.0.255.248/30|/0 === 10.0.255.248/30|/0 in failed, not found
    Nov 19 19:40:41	charon		14[KNL] <con2000|3> querying policy 10.0.255.248/30|/0 === 10.0.255.248/30|/0 in failed, not found
    Nov 19 19:40:41	charon		14[KNL] <con2000|3> querying policy 10.0.255.248/30|/0 === 10.0.255.248/30|/0 in failed, not found
    

    If I had the VTI settings to retain /0 on the remote, that's when my tunnels would constantly fail and restart after about a minute or so. So I executed the PFShell commands above to set /30. After doing so the IPSec/VTI 'appear' stable. But I can see my Security Association Database creating tons of new SPIs. So something still, just isn't right.

    I've setup my interfaces, OPT1 and OPT2, but I'm baffled as to why I don't see any Firewall Rule options for OPT1 like I saw in @ScottS post.
    0_1542657266406_1a21cd25-da3c-436c-842f-a3bcc077f072-image.png

    0_1542657320901_ae44bf7d-6320-4b07-9102-10c728ba698a-image.png

    I guess I'm curious if I should expect to see OPT1/OPT2 under my firewall rules and further, and further wonder if my accumulation of SPIs is an indication that things aren't quite right.

    I can PING

    Any help, or insights would be appreciated.



  • I also have a similar issue with the same error message - the tunnel comes up fine, routing is working bi-directionally but if I attempt to do an iperf across the tunnel stops transferring packets almost immediately.
    Tried changing the MTU down to 1300, but didn't change anything.

    I have 2 SG-3100's setup with ikev2 VTI.

    $ tracert 192.168.11.10

    Tracing route to 192.168.11.10 over a maximum of 30 hops

    1 <1 ms <1 ms <1 ms 192.168.1.1
    2 35 ms 20 ms 31 ms 10.255.255.2
    3 18 ms 28 ms 32 ms 192.168.11.10

    $ tracert 192.168.1.150

    Tracing route to 192.168.1.150 over a maximum of 30 hops

    1 <1 ms <1 ms <1 ms 192.168.11.1
    2 18 ms 23 ms 29 ms 10.255.255.1
    3 25 ms 35 ms 29 ms 192.168.1.150

    Nov 19 21:37:02 charon 13[KNL] <con2000|2> querying policy 10.255.255.2/32|/0 === 10.255.255.1/32|/0 in failed, not found

    $ iperf3 -c 192.168.11.10
    Connecting to host 192.168.11.10, port 5201
    [ 4] local 192.168.1.150 port 51858 connected to 192.168.11.10 port 5201
    [ ID] Interval Transfer Bandwidth
    [ 4] 0.00-1.01 sec 256 KBytes 2.07 Mbits/sec
    [ 4] 1.01-2.00 sec 0.00 Bytes 0.00 bits/sec
    [ 4] 2.00-3.00 sec 0.00 Bytes 0.00 bits/sec
    [ 4] 3.00-4.00 sec 0.00 Bytes 0.00 bits/sec
    [ 4] 4.00-5.00 sec 0.00 Bytes 0.00 bits/sec
    [ 4] 5.00-6.00 sec 0.00 Bytes 0.00 bits/sec
    [ 4] 6.00-7.01 sec 0.00 Bytes 0.00 bits/sec
    [ 4] 7.01-8.00 sec 0.00 Bytes 0.00 bits/sec
    [ 4] 8.00-9.00 sec 0.00 Bytes 0.00 bits/sec
    [ 4] 9.00-10.02 sec 0.00 Bytes 0.00 bits/sec


    [ ID] Interval Transfer Bandwidth
    [ 4] 0.00-10.02 sec 256 KBytes 209 Kbits/sec sender
    [ 4] 0.00-10.02 sec 7.97 KBytes 6.52 Kbits/sec receiver

    The_Saint - check that your local and remote assignment is different, in the screenshot it looks like you have both local and remote as the same /32 (10.0.255.248)?



  • @bradlay
    Thank you for your reply Bradly. This is my config
    0_1542728259767_5661fd80-7d62-4ff0-b145-b4b41638cf9f-image.png
    I used PFShell to edit the fields manually though it doesn't seem to take the

    $config['ipsec']['phase2'][0]['remoteid']['type'] = "network";
    $config['ipsec']['phase2'][1]['remoteid']['type'] = "network";
    

    0_1542728435637_899e9ff2-098b-4885-b27c-b5a0c00910ef-image.png

    For your issue, does your FW actually have interfaces for your VTI (besides the IPSec)?
    Also, do you have MSS settings enabled?



  • Is the VTI patch needed since 4.2.2 patch2, seeing an odd issue where SSH hangs looks like an MTU issue but it doesn't seem to make a blind bit of difference as to what I set the MSS to in the Ipsec settings.

    This was on a new deploy, though it was an LRO issue with vmware, but since upgraded my other firewall from 4.2.2 p1 with the VTI patch to 4.2.2 p2 and are now having the same issue (that one runs in proxmox)

    Edit:

    Setting the MTU on the VTI interface slightly higher than the MSS on IPSEC > Advanced and lower than the physical interface seemed to fix it

    MTU on PHY: 1500
    MTU on VTI: 1450
    MSS on IPSEC > Advanced 1400

    It took me way to long to get to the bottom of that, i'm off to grab a coffee



  • @dragon2611 any update? I have been having a reoccurring issue, both ssh issues, and over all routing and connectivity issues through the VTI tunnel. I am also have the phase2 reestablish and not kill off old session/id.
    I followed the hangouts setup verbatim. I know its the VTI as communication via openvpn and client if flawless.



  • Setting 1400 for MSS (advanced settings on the IPSEC config) and then setting MTU of 1450 on the VTI interface itself (once you've assigned it via assign interface you should then be able to change it's MTU) seemed to fix it for me.

    This is a tunnel over a link that has an MTU of 1500, if you have a tunnel going over something with a lower MTU (E.g PPPoE) you might have to adjust the values downwards slightly.



  • It sounds like there is a Bug that causes the MTU set on the VTI interfaces to revert on a reboot/restart.
    Looks like it's already in but as a feature request - https://redmine.pfsense.org/issues/9111 - I'd argue it's a bug because it breaks things by causing MTU issues on the tunnel.