DMVPN two spokes in EIGRP same subnet IP.

[fwitron1981]

I been having this doubt in this scenario. I have to two sites DMVPN spoke each of them. As you can see the network 10.25.138.0 are on both sites which is the inside network is this possible or will there be a conflict.

Spoke-1

router eigrp 100
network 10.25.138.0 0.0.0.7
network 172.20.1.0 0.0.0.255

Spoke-2

router eigrp 100
network 10.25.138.0 0.0.0.7
network 172.20.1.0 0.0.0.255

Thanks,

[Giuseppe Larosa]

Hello @fwitron1981 ,

this is not supported you will need to use NAT on both routers and to publish the NATTed pool instead of the conflicting overlapping subnet.

you can use a loopback to represent the NAT address pool and so you can advertise it on EIGRP.

You need to use two different NAT pools of course.

Edit:

as an alterntive consider changing the subnet in one site. It can make your life easier

Hope to help

Giuseppe

[fwitron1981]

Thank you for the info. However i have figure out that the inside network will be for spoke 1 remain the same on spoke 2 we will used the next octet that is follow as you see below.

Spoke-1

router eigrp 100
network 10.25.138.0 0.0.0.7
network 172.20.1.0 0.0.0.255

Spoke-2

router eigrp 100
network 10.25.138.9 0.0.0.7
network 172.20.1.0 0.0.0.255

[pman]

Is there a connection between spoke 1 and spoke 2?
Can you separate in VRFs?
Can you use NATs?

[fwitron1981]

Not yet but will be once i figure out the eigrp situation which i have already. Yes i can do VRF but that will change my config and NAT is not an option.

There the spoke 1 we know that is /29 which will give me 5 usable IP and what i'm going to do is user another /29 following the next network address which is 10.29.138.8 which will resolve my issue.

Hope it work.

[MHM Cisco World]

The One Big Advantage of the using MPLSoDMVPN is this case, 
two or more spoke have same subnet, then they can send traffic toward Hub BUT using the VRF/Label make Hub know that this is traffic from spoke1 and this from spoke2.