diff --git a/src/utils/nettools.py b/src/utils/nettools.py
index 49ce7d1..dc28d0e 100755
--- a/src/utils/nettools.py
+++ b/src/utils/nettools.py
@@ -430,6 +430,10 @@ class portcontrol(object):
         ports_lock.release()
         try:
             subprocess.run(['iptables','-t','nat','-A','PREROUTING','-p','tcp','--dport',str(free_port),"-j","DNAT",'--to-destination','%s:%s'%(container_ip,container_port)], stdout=subprocess.PIPE, stderr=subprocess.STDOUT, shell=False, check=True)
+        except subprocess.CalledProcessError as suberror:
+            return [False, "set port mapping failed : %s" % suberror.stdout.decode('utf-8')]
+        try:
+            subprocess.run(['iptables','-t','nat','-A','PREROUTING','-p','udp','--dport',str(free_port),"-j","DNAT",'--to-destination','%s:%s'%(container_ip,container_port)], stdout=subprocess.PIPE, stderr=subprocess.STDOUT, shell=False, check=True)
             return [True, str(free_port)]
         except subprocess.CalledProcessError as suberror:
             return [False, "set port mapping failed : %s" % suberror.stdout.decode('utf-8')]
@@ -447,6 +451,10 @@ class portcontrol(object):
             subprocess.run(['iptables','-t','nat','-D','PREROUTING','-p','tcp','--dport',str(free_port),"-j","DNAT",'--to-destination','%s:%s'%(container_ip,container_port)], stdout=subprocess.PIPE, stderr=subprocess.STDOUT, shell=False, check=True)
         except subprocess.CalledProcessError as suberror:
             return [False, "release port mapping failed : %s" % suberror.stdout.decode('utf-8')]
+        try:
+            subprocess.run(['iptables','-t','nat','-D','PREROUTING','-p','udp','--dport',str(free_port),"-j","DNAT",'--to-destination','%s:%s'%(container_ip,container_port)], stdout=subprocess.PIPE, stderr=subprocess.STDOUT, shell=False, check=True)
+        except subprocess.CalledProcessError as suberror:
+            return [False, "release port mapping failed : %s" % suberror.stdout.decode('utf-8')]
         ports_lock.acquire()
         free_ports[free_port] = True
         allocated_ports[container_name].pop(container_port)