I cannot ping a specific port

[ch_2718]

Good day everyone, I am a college student with a project, and I am new to cisco, so here is my problem.

I am trying to ping the end devices of R0 from the end devices of R1,R2,R3 and vice versa. now from the pc's of R1,2 and 3 I can ping them until the Switch 1 and 2 and when I tried pinging the pc's of R0 from the pc's of R1,2,3 it shows "Reply from <ip add>: Destination host unreachable." like that. but when I try to ping from the end devices of R0 it can only rich the R0 serial 0/0/1 and when I ping R0 pc to R1,2,3 pc it shows "Request timed out.". what do you thing is wrong? so R0 and R1 needs EIGRP and  R1,2 and 3 is under STATIC. End devices of R0 has VLANs 10-30, the switch has trunk and access mode 

[Jon Marshall · Accepted solution]

First check that each PC can ping it's own default gateway ie. the IP of the router that the PC connects to the rest of the network through. 

If they call ping their own default gateways then it is probably a routing issue, so the next thing to check are the routing tables on all the routers ie. does each router have all the necessary routes. 

You can use ping and traceroute to help identify where the issue is. 

Jon