Port forwarding with VZVmnetNetworkDeviceAttachment

Question

Created 1d

Replies 2

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I have the following code for port forwarding in mac os virtualization

        var ipAddr = in_addr()
        
        // 1. Convert String to in_addr
        inet_pton(AF_INET, guestIP, &ipAddr)
        
        let status = vmnet_network_configuration_add_port_forwarding_rule(
            config,
            UInt8(IPPROTO_TCP),                        // TCP protocol
            sa_family_t(AF_INET),     // address family
            guestPort,                // internal port (guest)
            externalPort,             // external port (host)
            &ipAddr                   // internal address (guest IP)
        )
        
        if status == .VMNET_SUCCESS {
            print("✅ Port Forwarding set: Mac:\(externalPort) -> VM(\(guestIP)):\(guestPort)")
        } else {
            print("❌ Port Forwarding failed for \(guestIP): \(status.rawValue)")
        }

It is returning success but when i test it it does not work. Is there anything i am doing wrong? Please help me also in fixing this problem. Note: The app runs in sandbox i tried without sandboxing and it does not work either. Please refer to this link https://developer.apple.com/forums/thread/822025?login=true&page=1#884236022 how i am creating the VZVmnetNetworkDeviceAttachment

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Answer 1

DTS Engineer OP

Apple

3h

Is there anything i am doing wrong?

It’s hard to say without more context. Specifically:

What network have you assigned to the interface?
Has the guest successfully acquired an IP address?
Does that IP address match the IP address you’re passing in here (ipAddr)?
What value as you using for guestPort?
Are you sure that the guest is listening on the port? If you run a command on the guest to connect to it’s IP address and port (so ipAddr and guestPort), does that go through?

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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0

Answer 2

rbmanian75 OP

3h

ard to say without more context. Specifically:

The guest acquiring the ip address correct for test i have created web server on the guest listen on port 5264 when i try to acces the port directly with the ip address of the guest it is working. i can reach the guest ip from the host with the port 5264. so i forward port 8000 of host as external port in the sample code what i have provided and i access http://localhost:8000 on the host and it does not work. Hope i have give enough details.

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