IPSec VPN between ASAs with same subnet for Disaster Recovery

Answered Question
Feb 10th, 2012
User Badges:
  • Bronze, 100 points or more


I need some clarification from you guys.

We have to make disaster recovery site EasyVPN tunnels on Cisco 5505 ASA firewalls. Now there is only one main site and 3 remote sites.

For DR we have to use the same subnet as it is on the main site because the Vmware virtual machines will be replicated to DR.

For DR we are using Double Take software.

What is the best solution for this? I think that we could use Destination NAT on ASAs. The other sites (HQ and remote) will se only the NAT address of the

DR and not the real one which is the same as on the main site.

So guys, will this work? We are using IPSec VPN? In packet-tracer on ASA I see that the packet is first NATed and then encrypted, so it should work, yes?

I hope that somebody can confirm this.

Correct Answer by mudjain about 5 years 6 months ago

I can confirm it will definitely work,

for prior type natting refer 8.3:


for 8.3 and later also this is achievable.

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 5 (1 ratings)
smailmilak Tue, 02/14/2012 - 12:13
User Badges:
  • Bronze, 100 points or more

Thank you for the confirmation.

We will test it soon and I hope that it will work as expected.


This Discussion