bridging/tunneling between 2 networks

[kozharov]

Hello all,

The goal is to connect 2 customers' sites both having private addresses 10.0.0.0/8. The path between 2 sites traverses 3 routers.

I thing it can be done with bridging, tunneling or both but still not sure about exact configuration.

Do you know how it can be done?

Thanks,

Mike

[kkalaycioglu]

1. If you mean both sites are containing overlapping IP networks one solution is using NAT. A special NAT solution for overlapping networks can be found at: http://www.cisco.com/warp/public/556/3.html .

2. If both networks consist of different subnetworks of 10.0.0.0/8 network you haven't got a chance to route packets belonging to this private address space on routers connecting these two sites a tunneling technology (for example GRE) may help you. Documents below can explain the protocol and configuration issues:

http://www.cisco.com/univercd/cc/td/doc/product/core/7100/swcg/6342gre.htm#1057710

http://www.cisco.com/univercd/cc/td/doc/product/software/ios113ed/113ed_cr/fun_c/fcprt3/fclogint.htm

I hope it helps.

[kozharov]

The problem is not the ip addresses are overlapping, but one of the addresses of the same network located at site 1 and another addresses are located at site 2.

If both sites were connected to the same router it could be possible to do with bridging but there are 3 routers withing the path. Can it be done with tunneling or with some other means?

Mike

[kkalaycioglu]

If both networks consist of different subnetworks of 10.0.0.0/8 network you haven't got a chance to route packets belonging to this private address space on routers connecting these two sites a tunneling technology (for example GRE) may help you. Documents below can explain the protocol and configuration issues:

http://www.cisco.com/univercd/cc/td/doc/product/core/7100/swcg/6342gre.htm#1057710

http://www.cisco.com/univercd/cc/td/doc/product/software/ios113ed/113ed_cr/fun_c/fcprt3/fclogint.htm

I hope it helps.

[kozharov]

Will it work if both networks are logically the same network???

site 1:

10.1.1.2/8

10.1.1.4/8

site2:

10.1.1.3/8

10.1.1.5/8

[kkalaycioglu]

Are these interface addresses of the routers? If so in site 1 you've two interfaces and two subnets of 10.0.0.0/8 network: 10.1.1.2/24 and 10.1.1.4/24. Correct me if I'm wrong. In this case GRE will work.

[kozharov]

No, no, no

these addresses are the example of the customer sites' addresses and we have to "bridge" two sites using our ip network.

[csplau]

I will suggest you to use GRE tunnelling, but, the condition is both sites has to use Cisco router IOS 12.1 and above.

1. Create tunnelling interface:

-> In EXEC mode, int tunnel 0

2. Tuunel source and destination

3. select the tunnelling mode

4. attach the route to tunnel interface

[kozharov]

Thank you