diff --git a/bin/eth.sh b/bin/eth.sh
index 3ae8420..11eea28 100644
--- a/bin/eth.sh
+++ b/bin/eth.sh
@@ -1,8 +1,9 @@
 #!/bin/bash
+IP=$(ec2metadata --public-ipv4)
 trap "exit" INT
 if [[ -f /usr/bin/geth ]];
 then
-	geth -rpc -rpcport "8080" -maxpeers "50" -loglevel "4" -bootnodes "enode://09fbeec0d047e9a37e63f60f8618aa9df0e49271f3fadb2c070dc09e2099b95827b63a8b837c6fd01d0802d457dd83e3bd48bd3e6509f8209ed90dabbc30e3d3@52.16.188.185:30303"
+	geth -rpc -rpcport "8080" -maxpeers "50" -loglevel "4" -bootnodes "enode://09fbeec0d047e9a37e63f60f8618aa9df0e49271f3fadb2c070dc09e2099b95827b63a8b837c6fd01d0802d457dd83e3bd48bd3e6509f8209ed90dabbc30e3d3@52.16.188.185:30303" -nat "extip:$IP"
 else
-	eth -b -x 50 -r 52.16.188.185 -p 30303 -m off -v 4 -j
+	eth -b -x 50 -r 52.16.188.185 -p 30303 -m off -v 4 -j -u $IP
 fi
\ No newline at end of file