I've been having some issues lately with an online service, and the vendor suggests it's because I'm behind a dual-NAT. I spoke with my ISP and they say that I am not behind a dual-NAT. Additionally, I have a static IP.
However, my understanding was that if any of the hops at the start of a tracert are private IPs (on the WAN side of my router) then this would indicate dual-NAT.
Here's a tracert I did to Google DNS:
PS C:\Windows\system32> tracert 8.8.8.8
Tracing route to google-public-dns-a.google.com [8.8.8.8]
over a maximum of 30 hops:
1 <1 ms <1 ms <1 ms DSL-AC68U-B498 [192.168.1.1]
2 13 ms 11 ms 16 ms 10.0.254.108
3 15 ms 15 ms 11 ms 10.0.248.41
4 21 ms 18 ms 20 ms 10.0.248.173
5 19 ms 19 ms 18 ms xe-0-7-0-2-2.r00.londen10.uk.bb.gin.ntt.net [83.231.146.153]
6 18 ms 20 ms 19 ms ix-ae-24-0.tcore1.ldn-london.as6453.net [80.231.60.122]
7 21 ms 21 ms 20 ms 72.14.217.89
8 22 ms 22 ms 47 ms 108.170.246.161
9 19 ms 19 ms 19 ms 108.170.230.161
10 18 ms 18 ms 18 ms google-public-dns-a.google.com [8.8.8.8]
Trace complete.
So the 3 hops outside of my router are 10.0.x.x addresses. Am I dual-NATed ?
Thanks in advance for any advice.