Consider following network topology:
----------
---- (my network) ---- | Device 1 | (.101)
| 192.168.191.0/24 | ----------
| | ----------
| ---- | Device 2 | (.102)
| | ----------
| | ----------
| ------- | Device 3 | (.103)
| ---------- .
eth1 (.1) . . . . . . . . .
| .
-------- --- ------------
| Router | eth0 --- (unknown network) -- | ? | -- Internet -- | D3 Servers |
-------- --- ------------
I have a linux router between my private network and an unknown network. The unknown network can be another private network, I do not have control over that at all.
Most of the devices in my internal network connect the outside world over an HTTP Proxy residing in the Router, so there is no need for NAT between the private network and the unknown network.
However, I have one device (Device 3) that should be able to connect to a set of public IP address directly.
Because the unknown network can be also a private network, NATting might not be an option (due double NAT). Device 3 needs to connect a set of known public IP addresses and ports that cannot be changed. Device 3 can be isolated to another network logically (with DHCP configuration from the Router) but not physically. Apparently Device 3 cannot utilize the HTTP Proxy (CONNECT) provided by the Router.
Can I somehow configure my router to allow Device 3 to connect any public IP, and if yes, how?
