diff --git a/build_nat_network.sh b/build_nat_network.sh
index 9970a09..19c8c6f 100644
--- a/build_nat_network.sh
+++ b/build_nat_network.sh
@@ -56,10 +56,7 @@ EOF
 fi
 
 # 加载iptables并设置回源且允许NAT端口转发
-if ! command -v iptables &> /dev/null; then
-    _green "iptables 未安装，正在安装..."
-    apt-get install -y iptables
-fi
+apt-get install -y iptables iptables-persistent
 iptables -t nat -A POSTROUTING -j MASQUERADE
 sysctl net.ipv4.ip_forward=1
 sysctl_path=$(which sysctl)