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Backstory: I have a home PC network that is mixed hardwired and wireless, with a wireless access point and hardwired PCs - connected to a dual-WAN capable router, connected to a cable modem, connected to Cox Internet (only one WAN is in use at present). The LAN is 10.0.0.1/255.255.255.0. WAN is 68.7.112.78/255.255.252.0
For reasons I won't go into here, I recently had occasion to do a tracert to a web site that I frequent:
1 <1 ms <1 ms <1 ms 10.0.0.1
2 8 ms 7 ms 7 ms **10.165.32.1**
3 8 ms 7 ms 7 ms **68.6.14.168**
4 9 ms 9 ms 9 ms 100.120.108.30
5 13 ms 13 ms 13 ms 68.1.1.167
6 23 ms 22 ms 24 ms 68.105.30.190
7 13 ms 14 ms 13 ms a23-57-47-92.deploy.static.akamaitechnologies.com [23.57.47.92]
10.0.0.1 is my router.
10.165.32.1 is nonroutable, but is not on my LAN. What is it? Is it my cable modem?
68.6.14.168 is not my WAN IP address. It is a Cox IP address with no domain name, in the same netblock (NETBLK-SD-RDC-68-6-0-0) as my WAN IP address. My WAN IP address does not appear in the tracert. Why does something other than my WAN IP address appear here?
100.120.108.30 is in a shared address space for service providers, and the rest appears to be routing to get to an akamai server.
Thanks for any info.
OK, I see now why 68.7.112.78 would not be on the traceroute. It's another interface on the same device as 10.0.0.1. But I would expect the "next hop" from 68.7.112.78 to be on the same network. So if 10.65.32.1 is Cox's router (my router's "next hop" towards the final destination), does that mean that Cox's router also has an IP address in 68.6.0.0/15 (so, two or more interfaces), and it just chooses to report back the private IP address? – Rebeccah – 2019-01-30T03:26:25.363
Its definately possible, but not clear that that is the case. How did you find 68.7.112.78? I could be an external interface of the router on hop 2 or 4 of the traceroute, and NAT being used to deliver back to an IP address range in the 10.165 network - If you log into your router and view the WAN IP address that would confirm either way. – davidgo – 2019-01-30T03:40:35.200
68.7.112.78 is from my router's configuration information. – Rebeccah – 2019-01-30T03:46:27.473
WAN1 Link Up Primary Connection: Dynamic IP Status: Connected IP Address: 68.7.112.78 Subnet Mask: 255.255.252.0 Gateway: 68.7.112.1 – Rebeccah – 2019-01-30T03:46:39.393
So, Cox's router then would have an IP address of 68.7.112.1 and another one of 10.65.32.1? – Rebeccah – 2019-01-30T03:48:04.283
Correct. (padding for minimum character length) – davidgo – 2019-01-30T03:49:21.257
Also, I need to retract what I said about CGN earlier - they are not using GGN to you - although they are using internal IP addresses in their network (which is OK) – davidgo – 2019-01-30T03:50:15.140