Hi friends, I have 2 VPCs in different amazon AZs. That's like 2 offices in different cities. For data transfer reasons, I want to setup an IPSec VPN tunnel between them.
So I created 2 clean Ubuntu instances and installed StrongSwan with apt-get. I changed the 3 configuration files - ipsec.conf, ipsec.secret and strongswan.conf according to the example here http://www.strongswan.org/uml/testresults4/ikev2/net2net-psk/. When I ran 'sudo ipsec up net-net' on one of the Ubuntu server, I saw the output below: ********************************************************************** ubuntu@City1:~$ sudo ipsec up net-net initiating IKE_SA net-net[1] to y.y.y.y generating IKE_SA_INIT request 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) ] sending packet: from x.x.x.x[500] to y.y.y.y[500] retransmit 1 of request with message ID 0 sending packet: from x.x.x.x[500] to y.y.y.y[500] retransmit 2 of request with message ID 0 sending packet: from x.x.x.x[500] to y.y.y.y[500] retransmit 3 of request with message ID 0 sending packet: from x.x.x.x[500] to y.y.y.y[500] retransmit 4 of request with message ID 0 sending packet: from x.x.x.x[500] to y.y.y.y[500] retransmit 5 of request with message ID 0 sending packet: from x.x.x.x[500] to y.y.y.y[500] giving up after 5 retransmits establishing IKE_SA failed, peer not responding ********************************************************************** I'm sure that the firewall has been opened for the connection. I also ran tcpdump to monitor the traffic. But I saw nothing on each side. Any ideas? Best wishes, Sunny
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