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The internet and routers doesn't do anything magic about internal network ranges, it's just a route like any other. What matters is how you configure the router
by Hikikomori 3y ago
The internet and routers doesn't do anything magic about internal network ranges, it's just a route like any other. What matters is how you configure the router and the routing protocols.
An ISP can have internal routes advertised between their routers, at your edge you typically filter to only advertise your assigned ranges/supernets, ie 101.0.0/16 rather than all the small subnets they split it up to. They could also decide that internal ranges are filtered everywhere in their network.