[Swan] Intermittent connection issues

[Paul Wouters]

On Thu, 11 May 2017, sandeep.vegiraju at accenture.com wrote:

> We had an IPSEC tunnel setup between our RHEL server in AWS and LPAR’s in co-location. The connectivity is
> fine, but we are seeing intermittent connectivity issues and we need to refresh LPAR’s every time to get the
> issues resolved.
> 
> Please suggest if any time out setting needs to be included as part of the configuration file.

> include /etc/ipsec.d/*.conf

You did not show your actualy connection definition.

> May 11 10:26:14: "T_XX.XX.XX.XX" #111298: max number of retransmissions (8) reached STATE_MAIN_I1.  No
> response (or no acceptable response) to our first IKEv1 message

> May 11 10:26:15: "T_XX.XX.XX.XX" #111392: ignoring informational payload NO_PROPOSAL_CHOSEN, msgid=00000000,
> length=16

The remote did not like your first initiation packet.

> May 11 07:23:39: "T_XX.XX.XX.XX" #96258: STATE_QUICK_R1: sent QR1, inbound IPsec SA installed, expecting QI2
> tunnel mode {ESP=>0x23c8bf21 <0xdfa30f1d xfrm=3DES_0-HMAC_SHA1 NATOA=none NATD=none DPD=passive}

Apparently your end does match when being a responder. As a workaround,
you can try and set your ikelifetime and salifetime to 24h and hope that
the other end will rekey to you before that time.

It does indicate that you seem to have a minor misconfiguration between
the two endpoints.

Paul