diff --git a/TunnelKit/Sources/Core/SocketType.swift b/TunnelKit/Sources/Core/SocketType.swift
index 2bf5209..bd0ddff 100644
--- a/TunnelKit/Sources/Core/SocketType.swift
+++ b/TunnelKit/Sources/Core/SocketType.swift
@@ -33,4 +33,16 @@ public enum SocketType: String {
     
     /// TCP socket type.
     case tcp = "TCP"
+
+    /// UDP socket type (IPv4).
+    case udp4 = "UDP4"
+    
+    /// TCP socket type (IPv4).
+    case tcp4 = "TCP4"
+
+    /// UDP socket type (IPv6).
+    case udp6 = "UDP6"
+    
+    /// TCP socket type (IPv6).
+    case tcp6 = "TCP6"
 }
diff --git a/TunnelKit/Sources/Protocols/OpenVPN/AppExtension/ConnectionStrategy.swift b/TunnelKit/Sources/Protocols/OpenVPN/AppExtension/ConnectionStrategy.swift
index 0b4b78d..e00b4cb 100644
--- a/TunnelKit/Sources/Protocols/OpenVPN/AppExtension/ConnectionStrategy.swift
+++ b/TunnelKit/Sources/Protocols/OpenVPN/AppExtension/ConnectionStrategy.swift
@@ -156,11 +156,11 @@ private extension NEProvider {
     func createSocket(to address: String, protocol endpointProtocol: EndpointProtocol) -> GenericSocket {
         let endpoint = NWHostEndpoint(hostname: address, port: "\(endpointProtocol.port)")
         switch endpointProtocol.socketType {
-        case .udp:
+        case .udp, .udp4, .udp6:
             let impl = createUDPSession(to: endpoint, from: nil)
             return NEUDPSocket(impl: impl)
             
-        case .tcp:
+        case .tcp, .tcp4, .tcp6:
             let impl = createTCPConnection(to: endpoint, enableTLS: false, tlsParameters: nil, delegate: nil)
             return NETCPSocket(impl: impl)
         }
diff --git a/TunnelKit/Sources/Protocols/OpenVPN/ConfigurationParser.swift b/TunnelKit/Sources/Protocols/OpenVPN/ConfigurationParser.swift
index 49d4dba..a03fa89 100644
--- a/TunnelKit/Sources/Protocols/OpenVPN/ConfigurationParser.swift
+++ b/TunnelKit/Sources/Protocols/OpenVPN/ConfigurationParser.swift
@@ -62,11 +62,11 @@ extension OpenVPN {
             
             // MARK: Client
             
-            static let proto = NSRegularExpression("^proto +(udp6?|tcp6?)")
+            static let proto = NSRegularExpression("^proto +(udp[46]?|tcp[46]?)")
             
             static let port = NSRegularExpression("^port +\\d+")
             
-            static let remote = NSRegularExpression("^remote +[^ ]+( +\\d+)?( +(udp6?|tcp6?))?")
+            static let remote = NSRegularExpression("^remote +[^ ]+( +\\d+)?( +(udp[46]?|tcp[46]?))?")
             
             static let eku = NSRegularExpression("^remote-cert-tls +server")
             
@@ -817,10 +817,6 @@ private extension String {
 
 private extension SocketType {
     init?(protoString: String) {
-        var str = protoString
-        if str.hasSuffix("6") {
-            str.removeLast()
-        }
-        self.init(rawValue: str.uppercased())
+        self.init(rawValue: protoString.uppercased())
     }
 }