GitHub user PPisz closed a discussion: vpn - Peer requested tunnel 1 twice,
ignoring second one
I'm having trouble with VPN tunnels. Generally, once configured, they work
correctly. However, after connecting and disconnecting the tunnel several
times, no clients are accepted. The following information appears in the
daemon.log:
`Jul 16 18:36:56 systemvm ipsec[8324]: 07[IKE] 109.189.123.78 is initiating a
Main Mode IKE_SA
Jul 16 18:36:56 systemvm ipsec[8324]: 07[CFG] selected proposal:
IKE:AES_CBC_256/HMAC_SHA1_96/PRF_HMAC_SHA1/MODP_2048
Jul 16 18:36:56 systemvm ipsec[8324]: 07[ENC] generating ID_PROT response 0 [
SA V V V V ]
Jul 16 18:36:56 systemvm ipsec[8324]: 07[NET] sending packet: from
91.223.68.218[500] to 109.189.123.78[500] (160 bytes)
Jul 16 18:36:56 systemvm ipsec[8324]: 11[NET] received packet: from
109.189.123.78[500] to 91.223.68.218[500] (388 bytes)
Jul 16 18:36:56 systemvm ipsec[8324]: 11[ENC] parsed ID_PROT request 0 [ KE No
NAT-D NAT-D ]
Jul 16 18:36:56 systemvm ipsec[8324]: 11[IKE] remote host is behind NAT
Jul 16 18:36:56 systemvm ipsec[8324]: 11[ENC] generating ID_PROT response 0 [
KE No NAT-D NAT-D ]
Jul 16 18:36:56 systemvm ipsec[8324]: 11[NET] sending packet: from
91.223.68.218[500] to 109.189.123.78[500] (372 bytes)
Jul 16 18:36:56 systemvm ipsec[8324]: 08[NET] received packet: from
109.189.123.78[4500] to 91.223.68.218[4500] (76 bytes)
Jul 16 18:36:56 systemvm ipsec[8324]: 08[ENC] parsed ID_PROT request 0 [ ID
HASH ]
Jul 16 18:36:56 systemvm ipsec[8324]: 08[CFG] looking for pre-shared key peer
configs matching 91.223.68.218...109.189.123.78[10.2.2.127]
Jul 16 18:36:56 systemvm ipsec[8324]: 08[CFG] selected peer config "L2TP-PSK"
Jul 16 18:36:56 systemvm ipsec[8324]: 08[IKE] IKE_SA L2TP-PSK[9] established
between 91.223.68.218[91.223.68.218]...109.189.123.78[10.2.2.127]
Jul 16 18:36:56 systemvm ipsec[8324]: 08[ENC] generating ID_PROT response 0 [
ID HASH ]
Jul 16 18:36:56 systemvm ipsec[8324]: 08[NET] sending packet: from
91.223.68.218[4500] to 109.189.123.78[4500] (76 bytes)
Jul 16 18:36:56 systemvm ipsec[8324]: 06[NET] received packet: from
109.189.123.78[4500] to 91.223.68.218[4500] (332 bytes)
Jul 16 18:36:56 systemvm ipsec[8324]: 06[ENC] parsed QUICK_MODE request 1 [
HASH SA No ID ID NAT-OA NAT-OA ]
Jul 16 18:36:56 systemvm ipsec[8324]: 06[CFG] selected proposal:
ESP:AES_CBC_128/HMAC_SHA1_96/NO_EXT_SEQ
Jul 16 18:36:56 systemvm ipsec[8324]: 06[IKE] received 3600s lifetime,
configured 0s
Jul 16 18:36:56 systemvm ipsec[8324]: 06[IKE] received 250000000 lifebytes,
configured 0
Jul 16 18:36:57 systemvm charon: 06[CFG] selected proposal:
ESP:AES_CBC_128/HMAC_SHA1_96/NO_EXT_SEQ
Jul 16 18:36:57 systemvm ipsec[8324]: 06[ENC] generating QUICK_MODE response 1
[ HASH SA No ID ID NAT-OA NAT-OA ]
Jul 16 18:36:57 systemvm charon: 06[IKE] received 3600s lifetime, configured 0s
Jul 16 18:36:57 systemvm charon: 06[IKE] received 250000000 lifebytes,
configured 0
Jul 16 18:36:57 systemvm charon: 06[ENC] generating QUICK_MODE response 1 [
HASH SA No ID ID NAT-OA NAT-OA ]
Jul 16 18:36:57 systemvm charon: 06[NET] sending packet: from
91.223.68.218[4500] to 109.189.123.78[4500] (204 bytes)
Jul 16 18:36:57 systemvm charon: 05[NET] received packet: from
109.189.123.78[4500] to 91.223.68.218[4500] (60 bytes)
Jul 16 18:36:57 systemvm charon: 05[ENC] parsed QUICK_MODE request 1 [ HASH ]
Jul 16 18:36:57 systemvm charon: 05[IKE] CHILD_SA L2TP-PSK{7} established with
SPIs c3e5d7ce_i 23e570fe_o and TS 91.223.68.218/32[udp/l2f] ===
109.189.123.78/32[udp/l2f]
Jul 16 18:36:58 systemvm charon: 08[KNL] creating acquire job for policy
83.168.93.105/32[udp/l2f] === 109.189.123.78/32[udp/l2f] with reqid {1}
Jul 16 18:36:58 systemvm charon: 08[IKE] initiating IKE_SA L2TP-PSK[10] to
109.189.123.78
Jul 16 18:36:58 systemvm charon: 08[ENC] generating IKE_SA_INIT request 0 [ SA
KE No N(NATD_S_IP) N(NATD_D_IP) N(FRAG_SUP) N(HASH_ALG) N(REDIR_SUP) ]
Jul 16 18:36:58 systemvm charon: 08[NET] sending packet: from
83.168.93.105[500] to 109.189.123.78[500] (828 bytes)
Jul 16 18:36:58 systemvm charon: 06[NET] received packet: from
109.189.123.78[500] to 83.168.93.105[500] (36 bytes)
Jul 16 18:36:58 systemvm charon: 06[ENC] parsed IKE_SA_INIT response 0 [
N(NO_PROP) ]
Jul 16 18:36:58 systemvm charon: 06[IKE] received NO_PROPOSAL_CHOSEN notify
error
Jul 16 18:37:00 systemvm xl2tpd[8347]: control_finish: Peer requested tunnel 5
twice, ignoring second one.
Jul 16 18:37:02 systemvm systemd[1]: Started session-212.scope - Session 212 of
User root.
Jul 16 18:37:02 systemvm systemd[1]: session-212.scope: Deactivated
successfully.
Jul 16 18:37:04 systemvm xl2tpd[8347]: control_finish: Peer requested tunnel 5
twice, ignoring second one.
Jul 16 18:37:12 systemvm xl2tpd[8347]: control_finish: Peer requested tunnel 5
twice, ignoring second one.
Jul 16 18:37:22 systemvm xl2tpd[8347]: control_finish: Peer requested tunnel 5
twice, ignoring second one.
Jul 16 18:37:29 systemvm xl2tpd[8347]: Maximum retries exceeded for tunnel
30141. Closing.
Jul 16 18:37:29 systemvm xl2tpd[8347]: Connection 5 closed to 109.189.123.78,
port 1701 (Timeout)
Jul 16 18:37:32 systemvm charon: 16[NET] received packet: from
109.189.123.78[4500] to 91.223.68.218[4500] (76 bytes)
Jul 16 18:37:32 systemvm charon: 16[ENC] parsed INFORMATIONAL_V1 request
3657915425 [ HASH D ]
Jul 16 18:37:32 systemvm charon: 16[IKE] received DELETE for ESP CHILD_SA with
SPI 23e570fe
Jul 16 18:37:32 systemvm charon: 16[IKE] closing CHILD_SA L2TP-PSK{7} with SPIs
c3e5d7ce_i (540 bytes) 23e570fe_o (0 bytes) and TS 91.223.68.218/32[udp/l2f]
=== 109.189.123.78/32[udp/l2f]
Jul 16 18:37:32 systemvm systemd[1]: Started session-213.scope - Session 213 of
User root.
Jul 16 18:37:32 systemvm charon: 11[NET] received packet: from
109.189.123.78[4500] to 91.223.68.218[4500] (92 bytes)
Jul 16 18:37:32 systemvm charon: 11[ENC] parsed INFORMATIONAL_V1 request
3648886364 [ HASH D ]
Jul 16 18:37:32 systemvm charon: 11[IKE] received DELETE for IKE_SA L2TP-PSK[9]
Jul 16 18:37:32 systemvm charon: 11[IKE] deleting IKE_SA L2TP-PSK[9] between
91.223.68.218[91.223.68.218]...109.189.123.78[10.2.2.127]
Jul 16 18:37:32 systemvm systemd[1]: session-213.scope: Deactivated
successfully.`
I haven't found a way to restore the tunnel, restarting the network doesn't
help. Please help :-(
GitHub link: https://github.com/apache/cloudstack/discussions/11224
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