diff --git a/vendor/github.com/jcmturner/gokrb5/v8/client/network.go b/vendor/github.com/jcmturner/gokrb5/v8/client/network.go
new file mode 100644
index 0000000..634f015
--- /dev/null
+++ b/vendor/github.com/jcmturner/gokrb5/v8/client/network.go
@@ -0,0 +1,218 @@
+package client
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"strings"
+	"time"
+
+	"github.com/jcmturner/gokrb5/v8/iana/errorcode"
+	"github.com/jcmturner/gokrb5/v8/messages"
+)
+
+// SendToKDC performs network actions to send data to the KDC.
+func (cl *Client) sendToKDC(b []byte, realm string) ([]byte, error) {
+	var rb []byte
+	if cl.Config.LibDefaults.UDPPreferenceLimit == 1 {
+		//1 means we should always use TCP
+		rb, errtcp := cl.sendKDCTCP(realm, b)
+		if errtcp != nil {
+			if e, ok := errtcp.(messages.KRBError); ok {
+				return rb, e
+			}
+			return rb, fmt.Errorf("communication error with KDC via TCP: %v", errtcp)
+		}
+		return rb, nil
+	}
+	if len(b) <= cl.Config.LibDefaults.UDPPreferenceLimit {
+		//Try UDP first, TCP second
+		rb, errudp := cl.sendKDCUDP(realm, b)
+		if errudp != nil {
+			if e, ok := errudp.(messages.KRBError); ok && e.ErrorCode != errorcode.KRB_ERR_RESPONSE_TOO_BIG {
+				// Got a KRBError from KDC
+				// If this is not a KRB_ERR_RESPONSE_TOO_BIG we will return immediately otherwise will try TCP.
+				return rb, e
+			}
+			// Try TCP
+			r, errtcp := cl.sendKDCTCP(realm, b)
+			if errtcp != nil {
+				if e, ok := errtcp.(messages.KRBError); ok {
+					// Got a KRBError
+					return r, e
+				}
+				return r, fmt.Errorf("failed to communicate with KDC. Attempts made with UDP (%v) and then TCP (%v)", errudp, errtcp)
+			}
+			rb = r
+		}
+		return rb, nil
+	}
+	//Try TCP first, UDP second
+	rb, errtcp := cl.sendKDCTCP(realm, b)
+	if errtcp != nil {
+		if e, ok := errtcp.(messages.KRBError); ok {
+			// Got a KRBError from KDC so returning and not trying UDP.
+			return rb, e
+		}
+		rb, errudp := cl.sendKDCUDP(realm, b)
+		if errudp != nil {
+			if e, ok := errudp.(messages.KRBError); ok {
+				// Got a KRBError
+				return rb, e
+			}
+			return rb, fmt.Errorf("failed to communicate with KDC. Attempts made with TCP (%v) and then UDP (%v)", errtcp, errudp)
+		}
+	}
+	return rb, nil
+}
+
+// sendKDCUDP sends bytes to the KDC via UDP.
+func (cl *Client) sendKDCUDP(realm string, b []byte) ([]byte, error) {
+	var r []byte
+	_, kdcs, err := cl.Config.GetKDCs(realm, false)
+	if err != nil {
+		return r, err
+	}
+	r, err = dialSendUDP(kdcs, b)
+	if err != nil {
+		return r, err
+	}
+	return checkForKRBError(r)
+}
+
+// dialSendUDP establishes a UDP connection to a KDC.
+func dialSendUDP(kdcs map[int]string, b []byte) ([]byte, error) {
+	var errs []string
+	for i := 1; i <= len(kdcs); i++ {
+		udpAddr, err := net.ResolveUDPAddr("udp", kdcs[i])
+		if err != nil {
+			errs = append(errs, fmt.Sprintf("error resolving KDC address: %v", err))
+			continue
+		}
+
+		conn, err := net.DialTimeout("udp", udpAddr.String(), 5*time.Second)
+		if err != nil {
+			errs = append(errs, fmt.Sprintf("error setting dial timeout on connection to %s: %v", kdcs[i], err))
+			continue
+		}
+		if err := conn.SetDeadline(time.Now().Add(5 * time.Second)); err != nil {
+			errs = append(errs, fmt.Sprintf("error setting deadline on connection to %s: %v", kdcs[i], err))
+			continue
+		}
+		// conn is guaranteed to be a UDPConn
+		rb, err := sendUDP(conn.(*net.UDPConn), b)
+		if err != nil {
+			errs = append(errs, fmt.Sprintf("error sneding to %s: %v", kdcs[i], err))
+			continue
+		}
+		return rb, nil
+	}
+	return nil, fmt.Errorf("error sending to a KDC: %s", strings.Join(errs, "; "))
+}
+
+// sendUDP sends bytes to connection over UDP.
+func sendUDP(conn *net.UDPConn, b []byte) ([]byte, error) {
+	var r []byte
+	defer conn.Close()
+	_, err := conn.Write(b)
+	if err != nil {
+		return r, fmt.Errorf("error sending to (%s): %v", conn.RemoteAddr().String(), err)
+	}
+	udpbuf := make([]byte, 4096)
+	n, _, err := conn.ReadFrom(udpbuf)
+	r = udpbuf[:n]
+	if err != nil {
+		return r, fmt.Errorf("sending over UDP failed to %s: %v", conn.RemoteAddr().String(), err)
+	}
+	if len(r) < 1 {
+		return r, fmt.Errorf("no response data from %s", conn.RemoteAddr().String())
+	}
+	return r, nil
+}
+
+// sendKDCTCP sends bytes to the KDC via TCP.
+func (cl *Client) sendKDCTCP(realm string, b []byte) ([]byte, error) {
+	var r []byte
+	_, kdcs, err := cl.Config.GetKDCs(realm, true)
+	if err != nil {
+		return r, err
+	}
+	r, err = dialSendTCP(kdcs, b)
+	if err != nil {
+		return r, err
+	}
+	return checkForKRBError(r)
+}
+
+// dialKDCTCP establishes a TCP connection to a KDC.
+func dialSendTCP(kdcs map[int]string, b []byte) ([]byte, error) {
+	var errs []string
+	for i := 1; i <= len(kdcs); i++ {
+		tcpAddr, err := net.ResolveTCPAddr("tcp", kdcs[i])
+		if err != nil {
+			errs = append(errs, fmt.Sprintf("error resolving KDC address: %v", err))
+			continue
+		}
+
+		conn, err := net.DialTimeout("tcp", tcpAddr.String(), 5*time.Second)
+		if err != nil {
+			errs = append(errs, fmt.Sprintf("error setting dial timeout on connection to %s: %v", kdcs[i], err))
+			continue
+		}
+		if err := conn.SetDeadline(time.Now().Add(5 * time.Second)); err != nil {
+			errs = append(errs, fmt.Sprintf("error setting deadline on connection to %s: %v", kdcs[i], err))
+			continue
+		}
+		// conn is guaranteed to be a TCPConn
+		rb, err := sendTCP(conn.(*net.TCPConn), b)
+		if err != nil {
+			errs = append(errs, fmt.Sprintf("error sneding to %s: %v", kdcs[i], err))
+			continue
+		}
+		return rb, nil
+	}
+	return nil, errors.New("error in getting a TCP connection to any of the KDCs")
+}
+
+// sendTCP sends bytes to connection over TCP.
+func sendTCP(conn *net.TCPConn, b []byte) ([]byte, error) {
+	defer conn.Close()
+	var r []byte
+	// RFC 4120 7.2.2 specifies the first 4 bytes indicate the length of the message in big endian order.
+	hb := make([]byte, 4, 4)
+	binary.BigEndian.PutUint32(hb, uint32(len(b)))
+	b = append(hb, b...)
+
+	_, err := conn.Write(b)
+	if err != nil {
+		return r, fmt.Errorf("error sending to KDC (%s): %v", conn.RemoteAddr().String(), err)
+	}
+
+	sh := make([]byte, 4, 4)
+	_, err = conn.Read(sh)
+	if err != nil {
+		return r, fmt.Errorf("error reading response size header: %v", err)
+	}
+	s := binary.BigEndian.Uint32(sh)
+
+	rb := make([]byte, s, s)
+	_, err = io.ReadFull(conn, rb)
+	if err != nil {
+		return r, fmt.Errorf("error reading response: %v", err)
+	}
+	if len(rb) < 1 {
+		return r, fmt.Errorf("no response data from KDC %s", conn.RemoteAddr().String())
+	}
+	return rb, nil
+}
+
+// checkForKRBError checks if the response bytes from the KDC are a KRBError.
+func checkForKRBError(b []byte) ([]byte, error) {
+	var KRBErr messages.KRBError
+	if err := KRBErr.Unmarshal(b); err == nil {
+		return b, KRBErr
+	}
+	return b, nil
+}