The most likely cause is that the traffic is passing through a firewall with a global NAT rule at that point. Every returned packet from that point and beyond will have the NAT address, not the real IP of the hop that decremented the TTL and sent an icmp echo reply.
I am also getting the same issue but I have no firewall rather a router is doing NAT and a outside static nat is configured. But from inside it is showing all the nodes. Can you explain why this is happening ? For better understanding snapshot is given. Please let me know if you need more information.
ip nat outside source static 184.108.40.206 100.100.100.5 ( Router 2)
Traceroute from outside PC
Tracing route to 10.10.10.20 over a maximum of 30 hops:
1 0 ms 1 ms 1 ms 220.127.116.11 2 0 ms 0 ms 0 ms 10.10.10.20 (Here we should see the Router 2 as next-hop. NAT is configured on R2) 3 1 ms 0 ms 1 ms 10.10.10.20 4 * 10 ms 0 ms 10.10.10.20
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...