How is your topology? you have taken just physical link from Telco or using their MPLS infrastructure to connect DC to branch.
You can configure ip sla to monitor layer 3 reachability. when there will be any drop in the path, ip sla will go down. To check in which portion packet drop is happening, you can configure multiple ip sla to different point in the path. Suppose your path is R1--R2--R3--R4--R5 and drops are observed between R1 and R5. You can set ip sla from R1 to R2,R3,R4. during issue if ip sla to R2,R3 is up and R4-ipsla flaps that means issue is between R3 and R4.
Packet drop could be due to
- link layer1 issue (CRC will increase on interfaces in the path)
- Congestion (output drops will increase on interface in the path)
- Unstable routing in the network (route to destination will get refreshed)
I feel ,you should check result with certain MTU ,sometimes telco doesn't have end to end same mtu which affects some applications but normal ping works fine,i guess its called mss (maximum segment size).As suggested by akash ,you can also check delay and drops for UDP or icmp packet using IP SLA.
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