I have the following topology wher PE4 is a provider edge of an MPLS cloud, and Internet is a simple router.
PE4: F0/0 192.168.54.2/30
Internet E3/1: 192.168.54.1/30
I would like to ping those two router between them. Therefore I ran the following command:
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.54.1, timeout is 2 seconds:
Success rate is 0 percent (0/5)
At first glance I thought a configuration error would prevent the correct ICMP exchange. However after inspecting the link between them, I can see the ICMP packets were sent just fine from both ends. Notice in this screenshot that I took pings from both ways.
On the other end, Internet can ping PE4 just fine.
I expected PE4 to accept the ping replies just fine. What causes this behavior? How can I fix it?
I attached the configuration of PE4 (which I know is quite bloated) for reference.
My bigger issue was: through the MPLS cloud, a ping to 192.168.54.1 is successful, but "pinging" any route directly connected to "Internet" won't work. I guessed the issue stemed from this connectivity issue. If I understood correctly, this means is that when "pinging" a route connected to "Internet" from another end of the MPLS cloud, the packets simply can't be routed through the cloud (lack of gateway or similar I guess) hence my "Network unreachable" errors.
If what I said isn't nonsense I think I figured the reason of my issue.
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