diff --git a/shell/natpmpcd b/shell/natpmpcd
index fe5a290..83114bb 100755
--- a/shell/natpmpcd
+++ b/shell/natpmpcd
@@ -1,5 +1,8 @@
 #!/bin/sh
 
+PORT=$(natpmpc -a 1 0 udp 60 -g 10.2.0.1 | awk '/Mapped public/ {print $4}')
+echo "$PORT" | tee /usr/local/etc/natvpn_port.txt
+
 while true; do
     date
     natpmpc -a 1 0 udp 60 -g 10.2.0.1 && natpmpc -a 1 0 tcp 60 -g 10.2.0.1 || {