[strongSwan] Random IPSEC IKE1 Dropping

Mon Jul 21 19:47:13 CEST 2014

Update:

I was able to catch the failure happen.  This is a grepped charon.log.  The failure was detected by my NMS between 13:26 and 13:27.  Why am I continually experiencing issues with my IKEv1 tunnels?  Does anyone have any insight into this?

Jul 21 13:25:16 02[IKE] <customer-sa-01|100> queueing QUICK_DELETE task
Jul 21 13:25:16 02[IKE] <customer-sa-01|100> activating new tasks
Jul 21 13:25:16 02[IKE] <customer-sa-01|100>   activating QUICK_DELETE task
Jul 21 13:25:16 02[IKE] <customer-sa-01|100> closing expired CHILD_SA customer-sa-07{18} with SPIs ca4c0040_i 8ef96c82_o and TS a.b.c.0/24 === d.e.0.0/16
Jul 21 13:25:16 02[IKE] <customer-sa-01|100> sending DELETE for ESP CHILD_SA with SPI ca4c0040
Jul 21 13:25:16 02[ENC] <customer-sa-01|100> generating INFORMATIONAL_V1 request 1724216626 [ HASH D ]
Jul 21 13:25:16 02[NET] <customer-sa-01|100> sending packet: from f.g.h.i[4500] to j.k.l.m[4500] (76 bytes)
Jul 21 13:25:16 02[IKE] <customer-sa-01|100> activating new tasks
Jul 21 13:25:16 02[IKE] <customer-sa-01|100> nothing to initiate
Jul 21 13:25:16 08[NET] sending packet: from f.g.h.i[4500] to j.k.l.m[4500]
Jul 21 13:25:16 14[IKE] <customer-sa-01|100> queueing QUICK_DELETE task
Jul 21 13:25:16 14[IKE] <customer-sa-01|100> activating new tasks
Jul 21 13:25:16 14[IKE] <customer-sa-01|100>   activating QUICK_DELETE task
Jul 21 13:25:16 14[IKE] <customer-sa-01|100> activating new tasks
Jul 21 13:25:16 14[IKE] <customer-sa-01|100> nothing to initiate
Jul 21 13:29:07 13[IKE] <customer-sa-01|100> sending keep alive to j.k.l.m[4500]
Jul 21 13:29:07 08[NET] sending packet: from f.g.h.i[4500] to j.k.l.m[4500]
Jul 21 13:29:23 07[NET] received packet: from j.k.l.m[500] to f.g.h.i[500]
Jul 21 13:29:23 01[NET] <109> received packet: from j.k.l.m[500] to f.g.h.i[500] (264 bytes)
Jul 21 13:29:23 01[IKE] <109> j.k.l.m is initiating a Main Mode IKE_SA
Jul 21 13:29:23 01[NET] <109> sending packet: from f.g.h.i[500] to j.k.l.m[500] (140 bytes)
Jul 21 13:29:23 08[NET] sending packet: from f.g.h.i[500] to j.k.l.m[500]
Jul 21 13:29:23 07[NET] received packet: from j.k.l.m[500] to f.g.h.i[500]
Jul 21 13:29:23 15[NET] <109> received packet: from j.k.l.m[500] to f.g.h.i[500] (100 bytes)
Jul 21 13:29:24 07[NET] received packet: from j.k.l.m[500] to f.g.h.i[500]
Jul 21 13:29:24 14[NET] <110> received packet: from j.k.l.m[500] to f.g.h.i[500] (264 bytes)
Jul 21 13:29:24 14[IKE] <110> j.k.l.m is initiating a Main Mode IKE_SA
Jul 21 13:29:24 14[NET] <110> sending packet: from f.g.h.i[500] to j.k.l.m[500] (140 bytes)
Jul 21 13:29:24 08[NET] sending packet: from f.g.h.i[500] to j.k.l.m[500]
Jul 21 13:29:24 07[NET] received packet: from j.k.l.m[500] to f.g.h.i[500]
Jul 21 13:29:24 02[NET] <110> received packet: from j.k.l.m[500] to f.g.h.i[500] (100 bytes)
Jul 21 13:29:25 07[NET] received packet: from j.k.l.m[500] to f.g.h.i[500]
Jul 21 13:29:25 13[NET] <111> received packet: from j.k.l.m[500] to f.g.h.i[500] (264 bytes)
Jul 21 13:29:25 13[IKE] <111> j.k.l.m is initiating a Main Mode IKE_SA

-------------------Original post:------------------

Hello All,

I'm currently running this config on an active strongswan box.  I am running CentOS 6.5 (fully patched) along side of strongswan version "Linux strongSwan U5.0.4/K2.6.32-431.3.1.el6.x86_6"

We upgraded a while back from a version that still used pluto to this new version (which uses charon)  We've started to experience random conn drops (primarilly on sa-01 and sa-05.  The only way to resolve this that I've found is to perform a 'service strongswan restart' This is not the only conn which experiences this, so I'm thinking this may be a configuration issue or a bug.  The problem is, is I don't necessarily know much about ipsec.  I'm hoping someone can help me out.  Can anyone?  Please?

conn customer-sa-01
  auto=start
  rightsubnet=A.0.0.0/8
  also=customer-default

conn customer-sa-02
  auto=start
  rightsubnet=B.C.0.0/16
  also=customer-default

conn customer-sa-03
  auto=start
  rightsubnet=D.E.0.0/16
  also=customer-default

conn customer-sa-04
  auto=start
  rightsubnet=F.G.0.0/15
  also=customer-default

conn customer-sa-05
  auto=start
  rightsubnet=H.I.0.0/15
  also=customer-default

conn customer-sa-06
  auto=start
  rightsubnet=J.K.0.0/16
  also=customer-default

conn customer-sa-07
  auto=start
  rightsubnet=L.M.0.0/16
  also=customer-default

conn customer-sa-08
  auto=start
  rightsubnet=N.O.P.Q/32
  also=customer-default

conn customer-default
  keyingtries=%forever
  authby=secret
  left=R.S.T.U
  leftsubnet=V.W.X.0/24
  right=Y.Z.AA.BB
  rightallowany=yes
  keyexchange=ikev1
  ikelifetime=480m
  keylife=3600s
  mobike=no
  ike=aes256-sha1-modp1024
  esp=3des-md5

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