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LAN set up in an MPLS Network Environment

We currently use Dell SonicWalls to create VPN tunnels from the main location to each of our branches. Each location has it's own gateway address and all computers for each location are programmed with a corresponding IP address. We use static IPs rather than DHCP.

We are changing to an AT&T MPLS fiber network. There will be one DMZ firewall between us and the internet which will be managed by AT&T. All three locations will be connected via fiber. What will I need to change regarding our IP address structure.

Am I correct in thinking that there will only be one gateway and all computers will have to be given an IP address that corresponds to that gateway?

Are there any other changes that I might be missing?

I do not have a lot of experience in this area and need some guidance.

ASKER CERTIFIED SOLUTION

MadSpin

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bankwest

ASKER

AT&T is going to be managing the routers for us. They are also managing the firewall. The sonicwalls will no longer be used.

Just to confirm, the IP address of our sonicwalls can be transferred to the routers and the IP addressing scheme can remain the same.

It is my understanding that there will be a 20mg network based firewall to share Internet with all locations.

MadSpin

Ok, that sounds about right. By "network based firewall" I'm assuming you mean "cloud" on AT&Ts network.

Yes to confirm, you should be able to use the same IPs as your current sonicwalls for the AT&T routers. Then you don't have to change any client device networking.

Bryant Schaper

If you are pulling the sonicwalls and adding the internal IP address to managed router, then you should be fine. The internet connection they are probably referring to is in the MPLS cloud itself. So each MPLS circuit and router will have a default route that points to that router, and not one of your locations. They will send all your networks over BGP to each of your sites so you dont have to handle routing.

Just setup the LAN like normal, and your gateway is the MPLS router, they will handle the rest,

bankwest

ASKER

Thank you, everyone for all of your help!!!

Ian Arakel

Hi There,

Kindly update on the below:

i)
The hub and spoke locations would be connected via MPLS?
ii)
Will each location maintain its own internet or will they be routed via the hub?
Also is there a separated DIA circuit that you guys have procured?
iii)
The basic setup connectivity.
The reason for asking the same is to identify how the UTM based control would be implemented for the internet traffic in case you going to replace all the sonicwalls.