Hi Friends ... Manoj here ..Need you help to resolve the issue.
I have a router in Japan and am trying to ping a server that is located in US. I have an MPLS link to ISP. When I do a ping to the server, it times out. However, when i do an extended ping with the source as either the LAN or loopback interface and destination as the server, the ping is successfull. I have verified with ISP and they confirmed there is no issue from their end.
The outgoing interface is probably not routable from the destination. When you sepcify loopback or LAN interface the destination is able to return the traffic.
Some MPLS configurations do not assign an IP address to the physical interface and only use loopbacks for connectivity. That may be the case with you. Which interface is outgoing to the ISP and what IP address, if any, is assigned to it? If one is assigned, does the router in the US have a valid return path?