I wondered if someone could explain this to me.
At work we have a firewall that connects to the Internet and has an external IP configured on it via DHCP. The firewall's WAN port connects to an Alcatel NTE which is Virgin Media's Kit. This has a private IP address of 10.2.2.67 (it has a sticker and when you do a trace route it includes this as a hop).
traceroute to google.com, 64 hops max, 52 byte packets 1 10.9.1.254 (10.9.1.254) 6.657 ms 2.436 ms 2.234 ms 2 10.2.2.67 (10.2.2.67) 18.802 ms * 66.547 ms
I don't understand how the firewall can have an external ip configured on it and then something with a private IP address as the next hop, please could someone explain how the routing would work?
Virgin Media | | Alcatel NTE (Virgin Media 10.2.2.67) | | Firewall (89.x.x.x) | | Internal Network