Charter Business just turned up a 50/5 coax circuit for us at one of our sites. Originally we had ordered one public ip address for this location, but we ended up having to order another after the service was turned up to make it easier to allow our video monitoring company to watch the cameras at this location (recently installed as well).
So when I called Charter to get a second public ip address they gave me one no problem. But, it's on a different subnet and has a different gateway than the first public ip we had to start.
We have an ASA 5505 at this location currently, and there should be a way to configure it to use both ip addresses since this is not a dual ISP situation or trying to configure failover, etc. When you have a block of ip addresses it is pretty easy to configure the ASA to use them. I can do that. But it's this public ip on an alternate subnet that is throwing me for a loop.
I should also mention that we are using 10.0.1.0/24 for the LAN at this location and will be using 10.192.0.0/23 for the cameras. There will be no VLANs. The cameras just need to be on a different subnet. The ASA provides DHCP for devices on the 10.0.1.0/24 subnet only. Devices on the 10.192.0.0/23 subnet will have static ip addresses.
ASA 5505 Config
We have one interface tied to a switch port (port 0) for the first public ip and every other switch port on the ASA tied to the LAN ip block we are using at this location. I'd leave port 0 for public ip 1 and port 1 for LAN1 (10.0.1.0/24). Here's what I am thinking for the rest:
- list itemCreate a new interface tied to a 3rd switch port (port 2) that is set with the 2nd public ip I mention above.
- list itemCreate a matching static route for the second public ip.
- list itemCreate one more interface tied to a 4th switch port (port 3) for LAN2 (10.192.0.0/23).
- list itemConfigure all devices on each LAN to use the LAN gateway ip address for their specific segment.
Will what I have mentioned above work? I would then create access rules and NAT rules for the camera traffic using the second public ip. I'd really like to do one-to-one NAT for the second public ip and the NVR at this location since accessing the camera software seems to play better with that than NAT with PAT.
Have I over-complicated it? Any advice is much appreciated. The second ip being on a different subnet is really throwing me for a loop.