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Maniphest T3947

Route based IPSec VPN: Child_SA is not establishing when the peer connection-type are initiate/respond combination
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Description

Introduction:

IPSec_SA/Child_SA is not establishing when route based vpn is configured.

How to reproduce the issue:

  • Install two VyOS devices with version 1.4-rolling-202110240217
  • Configure one peer with connection-type "initiate" and other as "respond"

Initiator:

set interfaces vti vti0 address '192.168.0.2/30'
set protocols static route 172.16.0.0/24 interface vti0

set vpn ipsec esp-group esp1 compression 'disable'
set vpn ipsec esp-group esp1 lifetime '27000'
set vpn ipsec esp-group esp1 mode 'tunnel'
set vpn ipsec esp-group esp1 pfs 'disable'
set vpn ipsec esp-group esp1 proposal 1 encryption 'aes128'
set vpn ipsec esp-group esp1 proposal 1 hash 'sha1'
set vpn ipsec ike-group ike1 close-action 'none'
set vpn ipsec ike-group ike1 dead-peer-detection action 'restart'
set vpn ipsec ike-group ike1 dead-peer-detection interval '2'
set vpn ipsec ike-group ike1 dead-peer-detection timeout '15'
set vpn ipsec ike-group ike1 ikev2-reauth 'no'
set vpn ipsec ike-group ike1 key-exchange 'ikev1'
set vpn ipsec ike-group ike1 lifetime '27000'
set vpn ipsec ike-group ike1 proposal 1 dh-group '2'
set vpn ipsec ike-group ike1 proposal 1 encryption 'aes128'
set vpn ipsec ike-group ike1 proposal 1 hash 'sha1'
set vpn ipsec interface 'eth2'
set vpn ipsec site-to-site peer 10.10.0.1 authentication mode 'pre-shared-secret'
set vpn ipsec site-to-site peer 10.10.0.1 authentication pre-shared-secret 'secret'
set vpn ipsec site-to-site peer 10.10.0.1 connection-type 'initiate'
set vpn ipsec site-to-site peer 10.10.0.1 ike-group 'ike1'
set vpn ipsec site-to-site peer 10.10.0.1 ikev2-reauth 'inherit'
set vpn ipsec site-to-site peer 10.10.0.1 local-address '10.10.0.2'
set vpn ipsec site-to-site peer 10.10.0.1 vti bind 'vti0'
set vpn ipsec site-to-site peer 10.10.0.1 vti esp-group 'esp1'

Responder:

set interfaces vti vti0 address '192.168.0.1/30'
set protocols static route 10.2.0.0/24 interface vti0

set vpn ipsec esp-group esp1 compression 'disable'
set vpn ipsec esp-group esp1 lifetime '27000'
set vpn ipsec esp-group esp1 mode 'tunnel'
set vpn ipsec esp-group esp1 pfs 'disable'
set vpn ipsec esp-group esp1 proposal 1 encryption 'aes128'
set vpn ipsec esp-group esp1 proposal 1 hash 'sha1'
set vpn ipsec ike-group ike1 close-action 'none'
set vpn ipsec ike-group ike1 dead-peer-detection action 'restart'
set vpn ipsec ike-group ike1 dead-peer-detection interval '2'
set vpn ipsec ike-group ike1 dead-peer-detection timeout '15'
set vpn ipsec ike-group ike1 ikev2-reauth 'no'
set vpn ipsec ike-group ike1 key-exchange 'ikev1'
set vpn ipsec ike-group ike1 lifetime '27000'
set vpn ipsec ike-group ike1 proposal 1 dh-group '2'
set vpn ipsec ike-group ike1 proposal 1 encryption 'aes128'
set vpn ipsec ike-group ike1 proposal 1 hash 'sha1'
set vpn ipsec interface 'eth0'
set vpn ipsec site-to-site peer 10.10.0.2 authentication mode 'pre-shared-secre'
set vpn ipsec site-to-site peer 10.10.0.2 authentication pre-shared-secret 'sec'
set vpn ipsec site-to-site peer 10.10.0.2 connection-type 'respond'
set vpn ipsec site-to-site peer 10.10.0.2 ike-group 'ike1'
set vpn ipsec site-to-site peer 10.10.0.2 ikev2-reauth 'inherit'
set vpn ipsec site-to-site peer 10.10.0.2 local-address '10.10.0.1'
set vpn ipsec site-to-site peer 10.10.0.2 vti bind 'vti0'
set vpn ipsec site-to-site peer 10.10.0.2 vti esp-group 'esp1'

Logs:

Status:

vyos@vyos# run sh int
Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
Interface        IP Address                        S/L  Description
---------        ----------                        ---  -----------
eth0             10.10.0.1/24                      u/u
eth1             172.16.0.1/24                     u/u
eth2             -                                 u/u
eth3             -                                 u/u
lo               127.0.0.1/8                       u/u
                 ::1/128
vti0             192.168.0.1/30                    u/u
[edit]
vyos@vyos# run sh vpn ike sa
Peer ID / IP                            Local ID / IP
------------                            -------------
10.10.0.2 10.10.0.2                     10.10.0.1 10.10.0.1

    State  IKEVer  Encrypt      Hash          D-H Group      NAT-T  A-Time  L-Te
    -----  ------  -------      ----          ---------      -----  ------  ----
    up     IKEv1   AES_CBC_128  HMAC_SHA1_96  MODP_1024      no     3432    0

[edit]
vyos@vyos# run sh vpn ipsec sa
Connection          State    Uptime    Bytes In/Out    Packets In/Out    Remotel
------------------  -------  --------  --------------  ----------------  -------
peer_10-10-0-2_vti  down     N/A       N/A             N/A               N/A   A
[edit]
vyos@vyos# sudo ip a
4: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP g0
    link/ether 50:0c:00:07:00:02 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::520c:ff:fe07:2/64 scope link
       valid_lft forever preferred_lft forever
5: eth3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP g0
    link/ether 50:0c:00:07:00:03 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::520c:ff:fe07:3/64 scope link
       valid_lft forever preferred_lft forever
6: vti0@NONE: <NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group de0
    link/none
    inet 192.168.0.1/30 brd 192.168.0.3 scope global vti0
       valid_lft forever preferred_lft forever
[edit]
vyos@vyos# sudo swanctl -l
peer_10-10-0-2: #1, ESTABLISHED, IKEv1, e8bc3160191055c1_i e3f01992d0d7a06b_r*
  local  '10.10.0.1' @ 10.10.0.1[500]
  remote '10.10.0.2' @ 10.10.0.2[500]
  AES_CBC-128/HMAC_SHA1_96/PRF_HMAC_SHA1/MODP_1024
  established 3457s ago, rekeying in 22708s
[edit]
vyos@vyos# sudo swanctl -P
peer_10-10-0-2/peer_10-10-0-2_vti, TUNNEL
  local:  0.0.0.0/0 ::/0
  remote: 0.0.0.0/0 ::/0

charon logs from the responder:

Oct 27 19:31:29 vyos charon[2720]: 05[NET] <peer_10-10-0-2|1> received packet: f
rom 10.10.0.2[500] to 10.10.0.1[500] (60 bytes)
Oct 27 19:31:29 vyos charon[2720]: 05[ENC] <peer_10-10-0-2|1> parsed QUICK_MODE
request 2738380529 [ HASH ]
Oct 27 19:31:29 vyos charon[2720]: 05[CFG] <peer_10-10-0-2|1> unable to install
policy 0.0.0.0/0 === 0.0.0.0/0 in for reqid 2, the same policy for reqid 1 exist
s
Oct 27 19:31:29 vyos charon[2720]: 05[CFG] <peer_10-10-0-2|1> unable to install
policy 0.0.0.0/0 === 0.0.0.0/0 fwd for reqid 2, the same policy for reqid 1 exis
ts
Oct 27 19:31:29 vyos charon[2720]: 05[CFG] <peer_10-10-0-2|1> unable to install
policy 0.0.0.0/0 === 0.0.0.0/0 out for reqid 2, the same policy for reqid 1 exis
ts
Oct 27 17:31:29 vyos charon[2720]: 05[IKE] <peer_10-10-0-2|1> unable to install
IPsec policies (SPD) in kernel
Oct 27 17:31:29 vyos charon[2720]: 05[IKE] <peer_10-10-0-2|1> sending DELETE for
 ESP CHILD_SA with SPI ccb2d616

Initiator:

Oct 27 19:31:28 vyos charon[1838]: 05[NET] <peer_10-10-0-1|1> received packet: f
rom 10.10.0.1[500] to 10.10.0.2[500] (76 bytes)
Oct 27 19:31:28 vyos charon[1838]: 05[ENC] <peer_10-10-0-1|1> parsed INFORMATION
AL_V1 request 1505458366 [ HASH D ]
Oct 27 19:31:28 vyos charon[1838]: 05[IKE] <peer_10-10-0-1|1> received DELETE fo
r ESP CHILD_SA with SPI ca0bb8a1
Oct 27 19:31:28 vyos charon[1838]: 05[IKE] <peer_10-10-0-1|1> closing CHILD_SA p
eer_10-10-0-1_vti{2} with SPIs ca0bb8a1_i (0 bytes) c49ec57f_o (0 bytes) and TS
0.0.0.0/0 === 0.0.0.0/0

Initiator:

vyos@vyos# cat /etc/swanctl/swanctl.conf
### Autogenerated by vpn_ipsec.py ###

connections {
    peer_10-10-0-1 {
        proposals = aes128-sha1-modp1024
        version = 1
        local_addrs = 10.10.0.2 # dhcp:no
        remote_addrs = 10.10.0.1
        dpd_timeout = 15
        dpd_delay = 2
        rekey_time = 27000s
        mobike = yes
        keyingtries = 0
        local {
            auth = psk
        }
        remote {
            id = "10.10.0.1"
            auth = psk
        }
        children {
            peer_10-10-0-1_vti {
                esp_proposals = aes128-sha1
                life_time = 27000s
                local_ts = 0.0.0.0/0,::/0
                remote_ts = 0.0.0.0/0,::/0
                updown = "/etc/ipsec.d/vti-up-down vti0"
                                                if_id_in = 1
                if_id_out = 1
                ipcomp = no
                mode = tunnel
                start_action = start
                dpd_action = start
            }
        }
    }

}

pools {
}

secrets {
    ike_10-10-0-1 {
        id-local = 10.10.0.2 # dhcp:no
        id-remote = 10.10.0.1
        secret = "secret"
    }
}

Responder:

vyos@vyos# cat /etc/swanctl/swanctl.conf
### Autogenerated by vpn_ipsec.py ###

connections {
    peer_10-10-0-2 {
        proposals = aes128-sha1-modp1024
        version = 1
        local_addrs = 10.10.0.1 # dhcp:no
        remote_addrs = 10.10.0.2
        dpd_timeout = 15
        dpd_delay = 2
        rekey_time = 27000s
        mobike = yes
        keyingtries = 1
        local {
            auth = psk
        }
        remote {
            id = "10.10.0.2"
            auth = psk
        }
        children {
            peer_10-10-0-2_vti {
                esp_proposals = aes128-sha1
                life_time = 27000s
                local_ts = 0.0.0.0/0,::/0
                remote_ts = 0.0.0.0/0,::/0
                updown = "/etc/ipsec.d/vti-up-down vti0"
                                                if_id_in = 1
                if_id_out = 1
                ipcomp = no
                mode = tunnel
                start_action = trap
                dpd_action = start
            }
        }
    }

}

pools {
}

secrets {
    ike_10-10-0-2 {
        id-local = 10.10.0.1 # dhcp:no
        id-remote = 10.10.0.2
        secret = "secret"
    }
}

This is a fresh installation, so no previous policy configured
This option set vpn ipsec options disable-route-autoinstall does not help.

Details

Version
1.4-rolling-202110240217
Is it a breaking change?
Perfectly compatible
Issue type
Bug (incorrect behavior)

Event Timeline

SrividyaA created this task.Oct 27 2021, 8:46 PM
pasik subscribed.Oct 28 2021, 2:39 PM
Viacheslav changed the task status from Open to Confirmed.Nov 9 2021, 7:48 AM
Viacheslav added a subscriber: sarthurdev.Nov 9 2021, 8:17 AM
SrividyaA added a comment.Nov 26 2021, 10:59 AM

Tested with the latest rolling version: "1.4-rolling-202111240711"

This is the following observation:

When configured a peer as "initiate"(connection-type), then start_action= start and for respond the start_action= trap . In this kind of setup, the child_sa will be up if the responder sends traffic. So in policy based there is no issue, when the traffic is initiated tunnel comes up.

But with route based the vti interface is marked down. If I bring the vti interface manually up using this command sudo ip link set vti0 up and initiate the traffic from the responder peer then the ipsec sa status shows up.

Test cases I tried:

  1. Upgraded the devices from this version 1.4-rolling-202111090317 to 1.4-rolling-202111240711 , vyos configured as responder, the vti interface came up but for the peer configured as initiator vti interface remained down. If the traffic is initiated from responder, the tunnel comes up
vyos@vyos:~$ sh vpn ike sa
vyos@vyos:~$ sh vpn ipsec sa
Connection    State    Uptime    Bytes In/Out    Packets In/Out    Remote addrel
------------  -------  --------  --------------  ----------------  -------------
vyos@vyos:~$ ping 10.0.0.1
PING 10.0.0.1 (10.0.0.1) 56(84) bytes of data.
From 10.0.0.2 icmp_seq=1 Destination Host Unreachable
64 bytes from 10.0.0.1: icmp_seq=3 ttl=64 time=1.64 ms
64 bytes from 10.0.0.1: icmp_seq=4 ttl=64 time=1.44 ms
64 bytes from 10.0.0.1: icmp_seq=5 ttl=64 time=1.32 ms
  1. If I reboot the initiator , the interface goes down on both the peers, have to bring the interface manually up in the responder and dump some traffic.
  1. Also if there is no continuous traffic, the tunnel goes down even if the dead-peer-detection settings are configured.

Will it help to keep the vti interface always in "UP" status in the responder atleast to make the things work or it is not an ideal situation ?

jmbwell subscribed.Feb 5 2022, 4:40 AM
Viacheslav triaged this task as Normal priority.Jan 20 2024, 2:21 AM
syncer edited projects, added VyOS 1.4 Sagitta (1.4.0-GA); removed VyOS 1.4 Sagitta.May 7 2024, 8:03 AM
dmbaturin added a project: Restricted Project.Sep 16 2024, 4:16 PM
dmbaturin edited projects, added VyOS Rolling, VyOS 1.5 Circinus, VyOS 1.4 Sagitta (1.4.0); removed Restricted Project, VyOS 1.4 Sagitta (1.4.0-GA).Oct 14 2024, 9:30 AM
dmbaturin changed Is it a breaking change? from Unspecified (possibly destroys the router) to Perfectly compatible.
dmbaturin changed Issue type from Unspecified (please specify) to Bug (incorrect behavior).
vyosbot added a project: Bugs.Oct 14 2024, 11:32 AM
syncer added a subscriber: Global Notifications.Nov 1 2024, 9:19 PM
amjadhalim subscribed.Sep 12 2025, 10:12 PM