Getting routing table in iOS

Have you tried implementing a VPN service and then providing your own routing table?

Because, as far as I can tell, that's what Cisco AnyConnect is doing.

how can i get system routing table in iOS …

See this thread.

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—
Quinn "The Eskimo!"
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

Have you taken a stab at executing a VPN administration and afterward giving your own router table?

Since, as should be obvious, that is the thing that Cisco AnyConnect is doing. https://allroutertables.com/best-router-table/