[strongSwan] issue connecting to fortigate

[Doug Tucker]

Strongswan 5.8.4.  Odd issue connecting to a fortigate.   The tunnel  appears to establish and the SA up.  The fortigate shows phase1 and 2 complete but no traffic is passing.  The logs on the strongsan show something I'm not used to seeing.  It appears somehow that quickmode phase2 is responding on port 500 instead of 4500.  But again, it appears to complete.  Here the info from the logs.  Any ideas?

Jun 25 21:33:28 ip-100-105-8-167 charon: 07[ENC] generating QUICK_MODE response 2098315325 [ HASH SA No KE ID ID ]
Jun 25 21:33:28 ip-100-105-8-167 charon: 07[NET] sending packet: from 1.1.1.1[500] to 2.2.2.2[500] (380 bytes)
Jun 25 21:33:28 ip-100-105-8-167 charon: 08[NET] received packet: from 2.2.2.2[500] to 1.1.1.1[500] (60 bytes)
Jun 25 21:33:28 ip-100-105-8-167 charon: 08[ENC] parsed QUICK_MODE request 2098315325 [ HASH ]
Jun 25 21:33:28 ip-100-105-8-167 charon: 08[IKE] CHILD_SA sph-dr{71} established with SPIs c2b7d129_i 0a24e7dd_o and TS 1.1.0.0/16 === 2.2.0.0/28
Jun 25 21:33:43 ip-100-105-8-167 charon: 06[IKE] sending DPD request
Jun 25 21:33:43 ip-100-105-8-167 charon: 06[ENC] generating INFORMATIONAL_V1 request 1996139877 [ HASH N(DPD) ]
Jun 25 21:33:43 ip-100-105-8-167 charon: 06[NET] sending packet: from 1.1.1.1[500] to 2.2.2.2[500] (92 bytes)
Jun 25 21:33:43 ip-100-105-8-167 charon: 16[NET] received packet: from 2.2.2.2[500] to 1.1.1.1[500] (92 bytes)
Jun 25 21:33:43 ip-100-105-8-167 charon: 16[ENC] parsed INFORMATIONAL_V1 request 3916210465 [ HASH N(DPD_ACK) ]

ipsec statusall:

sph-dr[56]: ESTABLISHED 4 seconds ago, 1.1.1.13.3.3.3]...2.2.2.2[2.2.2.2]
      sph-dr[56]: IKEv1 SPIs: 92bf32eece46a7f9_i fb85b9ec02d6437f_r*, pre-shared key reauthentication in 7 hours
      sph-dr[56]: IKE proposal: AES_CBC_128/HMAC_SHA1_96/PRF_HMAC_SHA1/MODP_1536
      sph-dr{71}:  INSTALLED, TUNNEL, reqid 2, ESP SPIs: c2b7d129_i 0a24e7dd_o
      sph-dr{71}:  AES_CBC_128/HMAC_SHA1_96/MODP_1536, 0 bytes_i, 0 bytes_o, rekeying in 7 hours
      sph-dr{71}:   1.1.0.0/16 === 2.2.0.0/28




Doug Tucker
Sr. Director of Networking & Linux Operations

o: 817.975.5832  |  m: 817.975.5832

e: doug.tucker at navigaglobal.com



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