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Why cant I ping eBGP from one router across 1 hop to a loopback?

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Last Modified: 2017-12-22
I configure 3 routers in a line each with their own addresses and loopbacks. I then create bgp neighborship between them and advertise their loopbacks. I can ping from R1 to R2's loopback or R2 to R3's loopback but I am unable to ping from R3 to R1's loopback.

Did I miss some configuration or is that just how it is by nature?

Thanks!
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OHHHH so i have to advertise the directly connected links as well not just the loopbacks. And thats because the router does not know the return address even though it is even the routing table. Thanks!
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