[c-nsp] Overlapping Subnet Issue - Gateway IP Resides in Vendor Assigned Public IP Range

[Chris Evans]

You could have your isp assign a transit ip subnet for the link and then
out your ips internal your border router. Another thing you could do static
nats if the first option isn't available.
On Jul 9, 2012 7:50 PM, "Spencer Barnes" <spencer at ceiva.com> wrote:

> Hello,
>
> I'm trying to move to a new ISP.  Our old one provided a T3 and an
> external IP range.  The gateway IP they gave to us to assign to our router
> interface was on a different subnet than the external IPs they provided so
> having another interface dedicated to the external network was an easy
> setup.
>
> Our new ISP provided a gateway IP that is in the same subnet as the
> external IPs they provided for use.  The range they provided (changed for
> security) is 10.0.128.64/26.  They want us to assign 10.0.128.66 to our
> WAN interface and point all outbound traffic to 10.0.128.65.
>
> The problem with this setup is I can't dedicate another interface for the
> new external range because the subnets overlap.  I can change the g0/0
> interface to 10.0.128.66 255.255.255.252 and assign the other interface
> g0/1 10.0.128.96 255.255.255.224 but then I lose a bunch of external IPs.
>
> Is there a better way to do this so I can use all the IPs in the range?
>
> Thanks in advance for any input.
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