diff --git a/tests/simulation/run_node.sh b/tests/simulation/run_node.sh
index 7a8c5d2bd..45bd03b7e 100755
--- a/tests/simulation/run_node.sh
+++ b/tests/simulation/run_node.sh
@@ -27,7 +27,7 @@ cd "$GIT_ROOT"
 DATA_DIR="${SIMULATION_DIR}/node-$NODE_ID"
 PORT=$(( BASE_P2P_PORT + NODE_ID ))
 
-NAT_FLAG="--nat:none"
+NAT_FLAG="--nat:extip:127.0.0.1"
 if [ "${NAT:-}" == "1" ]; then
   NAT_FLAG="--nat:any"
 fi
diff --git a/vendor/nim-eth b/vendor/nim-eth
index 22bf279b0..e89e59aa5 160000
--- a/vendor/nim-eth
+++ b/vendor/nim-eth
@@ -1 +1 @@
-Subproject commit 22bf279b0794f55e08344fe54beddf44d3ae9549
+Subproject commit e89e59aa5952bf663b3b1fd705cdd6139f006672