Cannot ping devices in a subnet from another router

[ThomasD86]

Hi,

I feel like I am doing some obvious mistake but I cannot figure it out for the life of me. I have a lab with 2 router A and B between those 2 router I am using an iBGP istance to advertise routes to each other. 

Router A ID is 192.168.0.141

Router B ID is 192.168.0.140

On router A I have configured on an interface the 192.168.0.186/28 ip address. Connected to this interface there's a device with the ip address of 192.168.0.183. This device can be pinged from router A just fine.

From Router B however, I am unable to do so. A "show ip route 192.168.0.183" shows me this:

show ip route 192.168.0.183
Routing entry for 192.168.0.176/28
  Known via "bgp 65535", distance 200, metric 0, type internal
  Last update from 192.168.0.141 00:02:24 ago
  Routing Descriptor Blocks:
  * 192.168.0.141, from 192.168.0.141, 00:02:24 ago
      Route metric is 0, traffic share count is 1
      AS Hops 0
      MPLS label: none

So the network is being advertised just fine and the route to it is installed in the routing table by Router B but, trying to ping 192.168.0.183 fails. If I try to ping the interface on router A (192.168.0.186) the ping works just fine. I cannot figure out why this is happening. If I reach the interface that is in the same network I should by all means be able to reach anything on the same subnet but that's not happening. 
Can anyone advise?

Thank you

[paul driver]

Hello
Its due to IBGP loop prevention, An IBGP learned route is not advertised to another IBGP peer as part of  the inbult a loop
prevention mechanism.

Redistribute that internal subnet into bgp or make the two rtrs ebgp peers.

[ThomasD86]

Hi Paul,

thanks for the reply but I am not sure I am following you. Router A learns the route because it's directly connected to it. It then advertises it to its only iBGP neighbor Router B. It was my understanding that loop prevention would prevent a router to redistribute routes it learned from another iBGP neighbor to another iBGP neighbor but in this case, there are just 2 routers. 

Additionally, if it was loop prevention kicking in,  how does router B manages to install the route to the subnet in its routing table? From router B I can ping the interface on Router A that has the server directly connected just fine but, I cannot ping the server directly

[MHM Cisco World]

the device you connect 
1- config with default GW 
2- config with default route 

the device can not know path for return traffic.