Weird Question

[chandra_rc16]

If the configuration between two sites is like below, how can i tell the routes to the routers?

Please don't mind if it is silly or i'm missing some basics.

Regards,

Chandu

[milan.kulik · Accepted solution]

Hi,

NAT for overlapping subnets might be a solution for you?

See

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_configuration_example09186a0080093f30.shtml

for details.

Best regards,

Milan

[devils_advocate · Accepted solution]

There are no such thing as silly questions

You seem to have the same subnet (10.0.1.0 /24) on both sides which will not work as they are separated by a router...or two routers in this case.

When a Router recieves a packet, it does a lookup in its routing table for the destination IP address.

In your example, how would the Router know where to forward the packet if the 10.0.1.0 /24 subnet exists on both sides?

[chandra_rc16]

Got it.

So with the help of natting this is possible.

Regards,

Chandu

[milan.kulik]

Yes,

that's possible.

But I'd use this solution as a last chance only in a case it's absolutely impossible to readdress one of those subnets.

IMHO, it's much easier to change an address of one /24 subnet than to run two subnets with overlapping addresses for a long time.

Users will totally be confused by the same addresses on both sites and any troubleshooting would be a nightmare.

Best regards,

Milan