file.swift

    private func newPacketTunnelSettings(proxyHost: String, proxyPort: Int) -> NEPacketTunnelNetworkSettings {
        let settings = NEPacketTunnelNetworkSettings(tunnelRemoteAddress: "127.0.0.1")

        /* proxy settings */
        let proxySettings = NEProxySettings()
        proxySettings.httpServer = NEProxyServer(
            address: proxyHost,
            port: proxyPort
        )
        proxySettings.httpsServer = NEProxyServer(
            address: proxyHost,
            port: proxyPort
        )
        proxySettings.autoProxyConfigurationEnabled = false
        proxySettings.httpEnabled = true
        proxySettings.httpsEnabled = true
        proxySettings.matchDomains = [""]
        settings.proxySettings = proxySettings

        /* ipv4 settings */
        let ipv4Settings = NEIPv4Settings(addresses: ["192.169.89.1"], subnetMasks: ["255.255.255.0"])
        settings.ipv4Settings = ipv4Settings

        /* MTU */
        settings.mtu = 1500

        // DNS
        let dnsSettings = NEDNSSettings(servers: ["8.8.8.8", "1.1.1.1"])
        dnsSettings.matchDomains = [""]
        dnsSettings.matchDomainsNoSearch = false
        settings.dnsSettings = dnsSettings

        return settings
    }