Needed Help

[ashz14387]

In this topology Routers are configured as given in the diagram

Routing Protocols used,

B/W R0, R10, R7 ospf 

i have configured tap4 using iptables to nat and forward the traffic to my physical network adapter, which is connected to internet.

my question is when i ping R11 (i.e IP - 14.14.1.3) from the ubuntu machine it was unreachable, why?

Thanks in advance for the reply

[MHM Cisco World]

and other router. are you config static route ? if not you need to config default static route or OSPF between all router 

[ashz14387]

Forgot to mentioned that, i had already configured static NAT between other routers.
internally i can able to ping all the routers in topology ( i.e from R0 to R11, R12 to R9, etc.) but when i try to ping 14.14.1.3 from my ubuntu machine it was unreachable

[paul driver]

Hello

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@ashz14387 wrote:

Forgot to mentioned that, i had already configured static NAT between other routers.
internally i can able to ping all the routers in topology ( i.e from R0 to R11, R12 to R9, etc.) but when i try to ping 14.14.1.3 from my ubuntu machine it was unreachable

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So you have NAT running on all 3 rtrs (rtr0-7-11)  and Tap4 is external to the rest of the network , if so do you have a nat statement for the external hosts to reach 14.14.1.3 

Can you share the configuration of the rtrs please?

[MHM Cisco World]

for ubuntu it see mapped IP and it reachable 
but for R11 it must know how it can reachable ubuntu, you need static route in R11 point to R10

[Flavio Miranda]

Hi

 If your Ubuntu is using IP address 168.224.1.x, the only thing you need to add this network to the OSPF on R0.

But, if you are ping from another interface (network) from Ubuntu, you need to add a static route in R0, pointing to  Ubuntu and add the command "redistribute static subnets" on the OSPF.