Example how configure VPN profile based on IKEv2 protocol use NEVPNManager with certificate authentication, example was be tested on real devices, server use AlgoVPN.

VPNIKEv2Setup.swift

import Foundation
import NetworkExtension

class VPNIKEv2Setup {
    
    static let shared = VPNIKEv2Setup()

    let vpnManager = NEVPNManager.shared()
    
    func initVPNTunnelProviderManager() {

        print("CALL LOAD TO PREFERENCES...")
        self.vpnManager.loadFromPreferences { [self] (error) -> Void in
            
            if((error) != nil) {

                print("VPN Preferences error: 1 - \(String(describing: error))")
            } else {

                let IKEv2Protocol = NEVPNProtocolIKEv2()
                
                IKEv2Protocol.authenticationMethod = .certificate
                IKEv2Protocol.serverAddress = VPNServerSettings.shared.vpnServerAddress
                IKEv2Protocol.remoteIdentifier = VPNServerSettings.shared.vpnRemoteIdentifier
                IKEv2Protocol.localIdentifier = VPNServerSettings.shared.vpnLocalIdentifier

                IKEv2Protocol.useExtendedAuthentication = false
                IKEv2Protocol.ikeSecurityAssociationParameters.encryptionAlgorithm = .algorithmAES256GCM
                IKEv2Protocol.ikeSecurityAssociationParameters.diffieHellmanGroup = .group20
                IKEv2Protocol.ikeSecurityAssociationParameters.integrityAlgorithm = .SHA512
                IKEv2Protocol.ikeSecurityAssociationParameters.lifetimeMinutes = 1440

                IKEv2Protocol.childSecurityAssociationParameters.encryptionAlgorithm = .algorithmAES256GCM
                IKEv2Protocol.childSecurityAssociationParameters.diffieHellmanGroup = .group20
                IKEv2Protocol.childSecurityAssociationParameters.integrityAlgorithm = .SHA512
                IKEv2Protocol.childSecurityAssociationParameters.lifetimeMinutes = 1440
                
                IKEv2Protocol.deadPeerDetectionRate = .medium
                IKEv2Protocol.disableRedirect = true
                IKEv2Protocol.disableMOBIKE = false
                IKEv2Protocol.enableRevocationCheck = false
                IKEv2Protocol.enablePFS = true
                IKEv2Protocol.useConfigurationAttributeInternalIPSubnet = false

                IKEv2Protocol.serverCertificateIssuerCommonName = VPNServerSettings.shared.vpnServerCertificateIssuerCommonName
                IKEv2Protocol.disconnectOnSleep = false
                IKEv2Protocol.certificateType = .ECDSA384
                IKEv2Protocol.identityDataPassword = VPNServerSettings.shared.p12Password
                IKEv2Protocol.identityData = self.dataFromFile()

                self.vpnManager.protocolConfiguration = IKEv2Protocol
                self.vpnManager.localizedDescription = "Venom VPN"
                self.vpnManager.isEnabled = true
                self.vpnManager.isOnDemandEnabled = false

                //Set rules
                var rules = [NEOnDemandRule]()
                let rule = NEOnDemandRuleConnect()
                rule.interfaceTypeMatch = .any
                rules.append(rule)
//                self.vpnManager.onDemandRules = rules

                print("SAVE TO PREFERENCES...")
                //SAVE TO PREFERENCES...
                self.vpnManager.saveToPreferences(completionHandler: { (error) -> Void in
                    if((error) != nil) {

                        print("VPN Preferences error: 2 - \(String(describing: error))")
                    } else {

                        print("CALL LOAD TO PREFERENCES AGAIN...")
                        //CALL LOAD TO PREFERENCES AGAIN...
                        self.vpnManager.loadFromPreferences(completionHandler: { (error) in
                            if ((error) != nil) {
                                print("VPN Preferences error: 2 - \(String(describing: error))")
                            } else {
                                var startError: NSError?

                                do {
                                    //START THE CONNECTION...
                                    try self.vpnManager.connection.startVPNTunnel()
                                } catch let error as NSError {

                                    startError = error
                                    print(startError.debugDescription)
                                } catch {

                                    print("Fatal Error")
                                    fatalError()
                                }
                                if ((startError) != nil) {
                                    print("VPN Preferences error: 3 - \(String(describing: error))")

                                    //Show alert here
                                    print("title: Oops.., message: Something went wrong while connecting to the VPN. Please try again.")

                                    print(startError.debugDescription)
                                } else {

                                    print("Starting VPN...")
                                }
                            }
                        })
                    }
                })
            }
        }

    }

    //MARK:- Connect VPN
    static func connectVPN() {
        VPNIKEv2Setup().initVPNTunnelProviderManager()
        
    }

    //MARK:- Disconnect VPN
    static func disconnectVPN() {
        VPNIKEv2Setup().vpnManager.connection.stopVPNTunnel()
    }
    
    //MARK:- Disconnect VPN
    static func testConnect() {
        do {
            try VPNIKEv2Setup().vpnManager.connection.startVPNTunnel()
        } catch let error {
            print(error)
        }
    }

    //MARK:- check connection staatus
    static func checkStatus() {

        let status = VPNIKEv2Setup().vpnManager.connection.status
        print("VPN connection status = \(status.rawValue)")

        switch status {
        case NEVPNStatus.connected:

            print("Connected")

        case NEVPNStatus.invalid, NEVPNStatus.disconnected :

            print("Disconnected")

        case NEVPNStatus.connecting , NEVPNStatus.reasserting:

            print("Connecting")

        case NEVPNStatus.disconnecting:

            print("Disconnecting")

        default:
            print("Unknown VPN connection status")
        }
    }
    
    func dataFromFile() -> Data? {
        let rootCertPath = Bundle.main.url(forResource: "phone", withExtension: "p12")
        print(rootCertPath?.absoluteURL as Any)
        
        return try? Data(contentsOf: rootCertPath!.absoluteURL)
    }
    
}

class VPNServerSettings: NSObject {
    static let shared = VPNServerSettings()
    
    let p12Password = "*****" // password from file certificate "****.p12"
    let vpnServerAddress = "******"
    let vpnRemoteIdentifier = "*******" // In my case same like vpn server address
    let vpnLocalIdentifier = "phone@caf1e9*******.algo"
    let vpnServerCertificateIssuerCommonName = "*******" // In my case same like vpn server address
}

Thanks bro for email but how we can do per mission for VPN

…

On Mon, 6 Nov 2023, 11:58 pm IhorYachmenov, ***@***.***> wrote: ***@***.**** commented on this gist. ------------------------------ @Dearimranullah <https://github.com/Dearimranullah> It's possible this code worked well in 2019 not sure about it right now, in your case I guess the problem with "permission denied" this functionality requires VPN permission from the user, if you forgot about that this code wouldn't work absolutely — Reply to this email directly, view it on GitHub <https://gist.github.com/IhorYachmenov/fb63fd19f30541780950b6670e8a2865#gistcomment-4751759> or unsubscribe <https://github.com/notifications/unsubscribe-auth/AZVZ7AKNTQU6PRVOWVCLOM3YDEXOJBFKMF2HI4TJMJ2XIZLTSKBKK5TBNR2WLJDHNFZXJJDOMFWWLK3UNBZGKYLEL52HS4DFQKSXMYLMOVS2I5DSOVS2I3TBNVS3W5DIOJSWCZC7OBQXE5DJMNUXAYLOORPWCY3UNF3GS5DZVRZXKYTKMVRXIX3UPFYGLK2HNFZXIQ3PNVWWK3TUUZ2G64DJMNZZDAVEOR4XAZNEM5UXG5FFOZQWY5LFVEYTANJYGU3TEMBZU52HE2LHM5SXFJTDOJSWC5DF> . You are receiving this email because you were mentioned. Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub> .

@Dearimranullah select your Target than tab "Signing & Capabilities" and you should enable capability "Network Extension -> and check Packet Tunnel" and add another one capability "Personal VPN", and in your entitlements file add "Outgoing Network Connections" - > YES, maybe last step will added automatically can't recall that. Then when you will call loadFromPreferences you should see alert with permission access

Thanks sir I'll try and get back to you in case of any query

…

On Tue, 7 Nov 2023, 12:19 am IhorYachmenov, ***@***.***> wrote: ***@***.**** commented on this gist. ------------------------------ @Dearimranullah <https://github.com/Dearimranullah> select your Target than tab "Signing & Capabilities" and you should enable capability "Network Extension -> and check Packet Tunnel" and add another one capability "Personal VPN" — Reply to this email directly, view it on GitHub <https://gist.github.com/IhorYachmenov/fb63fd19f30541780950b6670e8a2865#gistcomment-4751777> or unsubscribe <https://github.com/notifications/unsubscribe-auth/AZVZ7ALWBKZ5U4XZSJBC3YDYDEZ37BFKMF2HI4TJMJ2XIZLTSKBKK5TBNR2WLJDHNFZXJJDOMFWWLK3UNBZGKYLEL52HS4DFQKSXMYLMOVS2I5DSOVS2I3TBNVS3W5DIOJSWCZC7OBQXE5DJMNUXAYLOORPWCY3UNF3GS5DZVRZXKYTKMVRXIX3UPFYGLK2HNFZXIQ3PNVWWK3TUUZ2G64DJMNZZDAVEOR4XAZNEM5UXG5FFOZQWY5LFVEYTANJYGU3TEMBZU52HE2LHM5SXFJTDOJSWC5DF> . You are receiving this email because you were mentioned. Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub> .

How do I use it in content view? Can you give me an example?

@Rayan25062011 Hi, in this realization VPNIKEv2Setup is Singelton because you can call any non-static function such as VPNIKEv2Setup.initVPNTunnelProviderManager.initVPNTunnelProviderManager(), and after that in any comfortable place use VPNIKEv2Setup. connectVPN() and disconnectVPN() etc., or rewrite realization for your requirements

@Rayan25062011 Hi, in this realization VPNIKEv2Setup is Singelton because you can call any non-static function such as VPNIKEv2Setup.initVPNTunnelProviderManager.initVPNTunnelProviderManager(), and after that in any comfortable place use VPNIKEv2Setup. connectVPN() and disconnectVPN() etc., or rewrite realization for your requirements

Thank you very much @IhorYachmenov