Github user jayapalu commented on the issue:
https://github.com/apache/cloudstack/pull/872
@swill
If your connection is not coming up without IKE DH in customer gateway
configuration then try configuring IKE DH in customer gateway value from
UI/API.
In strongswan 5.2 ipsec, customer gateway configuration (at least in one
customer gateway)need to configured IKE DH value (modp1024), without this the
connection is not coming up.
Config file VR example:
cat /etc/ipsec.d/ipsec.vpn-10.147.46.103.conf
#conn for vpn-10.147.46.103
conn vpn-10.147.46.103
left=10.147.46.104
leftsubnet=10.2.0.0/16
leftnexthop=10.147.46.1
right=10.147.46.103
rightsubnet=10.1.0.0/16
type=tunnel
authby=secret
keyexchange=ike
ike=3des-md5-modp1024
ikelifetime=24h
esp=3des-md5
lifetime=1h
pfs=no
keyingtries=2
auto=start
forceencaps=no
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