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Problems with IP addressing within the same subnet 255.255.0.0

We are trying to configure 2 c2611's to create a WAN using a point-to-point T-1. We need to know:

- Our internal IP addressing scheme uses a class b subnet mask (255.255.0.0) but our devices use addresses like 172.16.205.x or 172.16.210.xx . How can we make the router's interfaces accept this addressing scheme without changing the subnet? We need the two ethernet interfaces to be on the 172.16.0.0 network so that our servers, PBX, etc can talk to it and reach the WAN.

Is there a command we are missing to allow multiple IP Addresses within the same subnet to be programmed on interfaces E0/0 and E0/1 on the same router. Each time we program E0/1 we get a message saying 172.16.0.0 overlaps with Ethernet0/0. We have other brands of routers in house that allow us to use different IP's on the same subnet but there is a command that has to be issued to allow this to happen. Can anyone point me in the right direction?

Thanks in advance,

Jeff

1 REPLY
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Re: Problems with IP addressing within the same subnet 255.255.0

Jeff,

Each of your router's interfaces need to be addressed with unique IP networks. If this is not possible for your current addressing or system requirement you can bridge with your router to allow this 172.16.0.0/16 to span both ethernet interfaces. I would recommend breaking this up into smaller subnetworks if possible.

Hope this helps,

Don

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