diff --git a/sample_wg_cfg/wg-external.conf b/sample_wg_cfg/wg-external.conf
index b7f2dec..4044a23 100644
--- a/sample_wg_cfg/wg-external.conf
+++ b/sample_wg_cfg/wg-external.conf
@@ -1,8 +1,8 @@
 [Interface]
 Address=10.20.30.2/32
 PrivateKey=6CCRP42JiTObyf64Vo0BcqsX6vptsqOU+MKUslUun28=
-PostUp = iptables -t nat -A POSTROUTING -o ens2 -j MASQUERADE
-PostDown = iptables -t nat -D POSTROUTING -o ens2 -j MASQUERADE
+PostUp = iptables -t nat -A POSTROUTING -o `ip link show | awk -F ': ' '/state UP/ {print $2}'` -j MASQUERADE
+PostDown = iptables -t nat -D POSTROUTING -o `ip link show | awk -F ': ' '/state UP/ {print $2}'` -j MASQUERADE
 
 #internal node
 [Peer]
diff --git a/sample_wg_cfg/wg-internal.conf b/sample_wg_cfg/wg-internal.conf
index 17353db..c025637 100644
--- a/sample_wg_cfg/wg-internal.conf
+++ b/sample_wg_cfg/wg-internal.conf
@@ -2,10 +2,10 @@
 Address = 10.20.30.1/32
 ListenPort = 17968
 PrivateKey = kOd3FVBggwpjD3AlZKXUxNTzJT0+f3MJdUdR8n6ZBn8=
-PostUp = iptables -t nat -A POSTROUTING -o ens3 -j MASQUERADE
-PostUp = ip rule add from 195.2.79.13 table main
-PostDown = iptables -t nat -D POSTROUTING -o ens3 -j MASQUERADE
-PostDown = ip rule del from 195.2.79.13 table main
+PostUp = iptables -t nat -A POSTROUTING -o `ip link show | awk -F ': ' '/state UP/ {print $2}'` -j MASQUERADE
+PostUp = ip rule add from `ip route | awk '/default/ {print $3; exit}'` table main
+PostDown = iptables -t nat -D POSTROUTING -o `ip link show | awk -F ': ' '/state UP/ {print $2}'` -j MASQUERADE
+PostDown = ip rule del from `ip route | awk '/default/ {print $3; exit}'` table main
 
 #external node
 [Peer]