Changing my gateway IP address at a DR location to match my office gateway address
Posted on 2013-06-06
I have a question about routed traffic across a site to site VPN between 2 Cisco ASA 5510's. We have our office side and our DR side and the question is could I have an IP conflict of gateway IP address' if I make changes on my DR side's ASA. Below is a description of our set up.
We rent a cabinet offsite for DR purposes. We have a Cisco ASA 5510 at this DR site, 5510 at the main site too, and a site to site VPN set up between them. The subnet at the DR site is the same as our server subnet (to make life easy if we need to bring up servers for an emergency) but the gateway address is different at DR than the main site. When sending any traffic between sites, we have to reach over certain subnets created in the site to site VPN and they are routable between.
So from the office to get to DR site's 10 subnet (server subnet), the site to site VPN translates: 192.168.10.0/24 to 192.168.53.0/24
From DR to the office, it translates 192.168.10.0/24 to 192.168.52.0/24.
So if you're at DR and you need to see something back at the office, you reach out to 192.168.52.1 for a server for example. From the office to get to one of our VM hosts' that are storing shut down servers at DR, 192.168.53.25. This all routes fine and it's working for us.
What I'd like to do, and I believe I should be ok to change it since all traffic between sites has to translate to those other subnets is change that 192.168.10.8 gateway address at DR (inside interface IP on my DR ASA) to 192.168.10.10 like the gateway address I have at the office. Several reasons I'd want to do so but since I'm already a pretty wordy typer, I won't bore with more details. Let's just say it will make it a heck of a lot easier in case of an emergency but I don't want to shut one site down or the other if making this change is a bad thing.
Does someone have experience with this and would I be ok?
Thanks for any assistance,