diff --git a/CHANGELOG.md b/CHANGELOG.md
index 68c1afd..3e396df 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # 更新日志
 
+2023.08.15
+
+- 尝试增加Docker安装PVE的方法以适配宿主机不是Debian的情况，实测支持Ubuntu了，其他支持Docker的宿主机系统应该也没问题
+
 2023.08.11
 
 - 修复部分上次更新导致的新BUG，测试无误了
diff --git a/README.md b/README.md
index e322c6e..275de6c 100644
--- a/README.md
+++ b/README.md
@@ -13,9 +13,9 @@
 
 ## 更新
 
-2023.08.15
+2023.08.19
 
-- 尝试增加Docker安装PVE的方法以适配宿主机不是Debian的情况，实测支持Ubuntu了，其他支持Docker的宿主机系统应该也没问题
+- 修复创建NAT网络的时候，重复定义回源和重复保存NAT映射的问题
 
 [更新日志](CHANGELOG.md)
 
diff --git a/scripts/build_nat_network.sh b/scripts/build_nat_network.sh
index 41b329a..81bf886 100644
--- a/scripts/build_nat_network.sh
+++ b/scripts/build_nat_network.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 # from 
 # https://github.com/spiritLHLS/pve
-# 2023.08.17
+# 2023.08.19
 
 
 ########## 预设部分输出和部分中间变量
@@ -11,8 +11,11 @@ _green() { echo -e "\033[32m\033[01m$@\033[0m"; }
 _yellow() { echo -e "\033[33m\033[01m$@\033[0m"; }
 _blue() { echo -e "\033[36m\033[01m$@\033[0m"; }
 reading(){ read -rp "$(_green "$1")" "$2"; }
+
 export DEBIAN_FRONTEND=noninteractive
+
 utf8_locale=$(locale -a 2>/dev/null | grep -i -m 1 -E "UTF-8|utf8")
+
 if [[ -z "$utf8_locale" ]]; then
   echo "No UTF-8 locale found"
 else
@@ -21,6 +24,7 @@ else
   export LANGUAGE="$utf8_locale"
   echo "Locale set to $utf8_locale"
 fi
+
 rm -rf /usr/local/bin/build_backend_pve.txt
 
 ########## 查询信息
@@ -36,9 +40,11 @@ fi
 if [ -f /usr/local/bin/pve_check_ipv6 ]; then
     ipv6_address=$(cat /usr/local/bin/pve_check_ipv6)
 fi
+
 if [ -f /usr/local/bin/pve_ipv6_prefixlen ]; then
     ipv6_prefixlen=$(cat /usr/local/bin/pve_ipv6_prefixlen)
 fi
+
 if [ -f /usr/local/bin/pve_ipv6_gateway ]; then
     ipv6_gateway=$(cat /usr/local/bin/pve_ipv6_gateway)
 fi
@@ -47,9 +53,11 @@ fi
 if [ -f /usr/local/bin/pve_ipv4_address ]; then
     ipv4_address=$(cat /usr/local/bin/pve_ipv4_address)
 fi
+
 if [ -f /usr/local/bin/pve_ipv4_gateway ]; then
     ipv4_gateway=$(cat /usr/local/bin/pve_ipv4_gateway)
 fi
+
 if [ -f /usr/local/bin/pve_ipv4_subnet ]; then
     ipv4_subnet=$(cat /usr/local/bin/pve_ipv4_subnet)
 fi
@@ -58,6 +66,7 @@ fi
 if [ ! -f /etc/network/interfaces.bak ]; then
     cp /etc/network/interfaces /etc/network/interfaces.bak
 fi
+
 # 修正部分网络设置重复的错误
 if [[ -f "/etc/network/interfaces.d/50-cloud-init" && -f "/etc/network/interfaces" ]]; then
     if grep -q "auto lo" "/etc/network/interfaces.d/50-cloud-init" && grep -q "iface lo inet loopback" "/etc/network/interfaces.d/50-cloud-init" && grep -q "auto lo" "/etc/network/interfaces" && grep -q "iface lo inet loopback" "/etc/network/interfaces"; then
@@ -68,20 +77,24 @@ if [[ -f "/etc/network/interfaces.d/50-cloud-init" && -f "/etc/network/interface
         chattr +i /etc/network/interfaces.d/50-cloud-init
     fi
 fi
+
 if [ -f "/etc/network/interfaces.new" ];then
     chattr -i /etc/network/interfaces.new
     rm -rf /etc/network/interfaces.new
 fi
+
 interfaces_file="/etc/network/interfaces"
 chattr -i "$interfaces_file"
 if ! grep -q "auto lo" "$interfaces_file"; then
     _blue "Can not find 'auto lo' in ${interfaces_file}"
     exit 1
 fi
+
 if ! grep -q "iface lo inet loopback" "$interfaces_file"; then
     _blue "Can not find 'iface lo inet loopback' in ${interfaces_file}"
     exit 1
 fi
+
 # 配置vmbr0
 chattr -i /etc/network/interfaces
 if grep -q "vmbr0" "/etc/network/interfaces"; then
@@ -110,6 +123,7 @@ iface vmbr0 inet static
 
 iface vmbr0 inet6 auto
     bridge_ports $interface
+    pre-up echo 2 > /proc/sys/net/ipv6/conf/vmbr0/accept_ra
 EOF
     else
 cat << EOF | sudo tee -a /etc/network/interfaces
@@ -127,6 +141,7 @@ iface vmbr0 inet6 static
 EOF
     fi
 fi
+
 if grep -q "vmbr1" "$interfaces_file"; then
     _blue "vmbr1 already exists in ${interfaces_file}"
     _blue "vmbr1 已存在在 ${interfaces_file}"
@@ -140,11 +155,6 @@ iface vmbr1 inet static
     bridge_stp off
     bridge_fd 0
     post-up echo 1 > /proc/sys/net/ipv4/ip_forward
-    post-up echo 1 > /proc/sys/net/ipv4/conf/vmbr1/proxy_arp
-    post-up iptables -t nat -A POSTROUTING -s '172.16.1.0/24' -o vmbr0 -j MASQUERADE
-    post-down iptables -t nat -D POSTROUTING -s '172.16.1.0/24' -o vmbr0 -j MASQUERADE
-
-pre-up echo 2 > /proc/sys/net/ipv6/conf/vmbr0/accept_ra
 EOF
 elif [ -z "$ipv6_address" ] || [ -z "$ipv6_prefixlen" ] || [ -z "$ipv6_gateway" ]; then
 cat << EOF | sudo tee -a "$interfaces_file"
@@ -156,9 +166,6 @@ iface vmbr1 inet static
     bridge_stp off
     bridge_fd 0
     post-up echo 1 > /proc/sys/net/ipv4/ip_forward
-    post-up echo 1 > /proc/sys/net/ipv4/conf/vmbr1/proxy_arp
-    post-up iptables -t nat -A POSTROUTING -s '172.16.1.0/24' -o vmbr0 -j MASQUERADE
-    post-down iptables -t nat -D POSTROUTING -s '172.16.1.0/24' -o vmbr0 -j MASQUERADE
 EOF
 else
 cat << EOF | sudo tee -a "$interfaces_file"
@@ -170,45 +177,33 @@ iface vmbr1 inet static
     bridge_stp off
     bridge_fd 0
     post-up echo 1 > /proc/sys/net/ipv4/ip_forward
-    post-up echo 1 > /proc/sys/net/ipv4/conf/vmbr1/proxy_arp
-    post-up iptables -t nat -A POSTROUTING -s '172.16.1.0/24' -o vmbr0 -j MASQUERADE
-    post-down iptables -t nat -D POSTROUTING -s '172.16.1.0/24' -o vmbr0 -j MASQUERADE
 
 iface vmbr1 inet6 static
     address 2001:db8:1::1/64
     post-up sysctl -w net.ipv6.conf.all.forwarding=1
-    post-up ip6tables -t nat -A POSTROUTING -s 2001:db8:1::/64 -o vmbr0 -j MASQUERADE
-    post-down sysctl -w net.ipv6.conf.all.forwarding=0
-    post-down ip6tables -t nat -D POSTROUTING -s 2001:db8:1::/64 -o vmbr0 -j MASQUERADE
 EOF
 fi
+
 chattr +i /etc/network/interfaces
 rm -rf /usr/local/bin/iface_auto.txt
 
 # 加载iptables并设置回源且允许NAT端口转发
 apt-get install -y iptables iptables-persistent
-iptables -t nat -A POSTROUTING -j MASQUERADE
-sysctl net.ipv4.ip_forward=1
-sysctl_path=$(which sysctl)
-if grep -q "^net.ipv4.ip_forward=1" /etc/sysctl.conf; then
-  if grep -q "^#net.ipv4.ip_forward=1" /etc/sysctl.conf; then
-    sed -i 's/^#net.ipv4.ip_forward=1/net.ipv4.ip_forward=1/' /etc/sysctl.conf
-  fi
-else
-    echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf
-fi
-${sysctl_path} -p
+iptables -t nat -A POSTROUTING -s 172.16.1.0/24 -o vmbr0 -j MASQUERADE
+ip6tables -t nat -A POSTROUTING -s 2001:db8:1::/64 -o vmbr0 -j MASQUERADE
+iptables-save > /etc/iptables/rules.v4
+ip6tables-save > /etc/iptables/rules.v6
 
 # 重启配置
-service networking restart
-systemctl restart networking.service
 sleep 3
-ifreload -ad
+ifreload -a
+
 # 已加载网络，删除对应缓存文件
 if [ -f "/etc/network/interfaces.new" ];then
     chattr -i /etc/network/interfaces.new
     rm -rf /etc/network/interfaces.new
 fi
+
 systemctl start check-dns.service
 # _green "Although the gateway has been set automatically, I am not sure if it has been applied successfully, please check in Datacenter-->pve-->System-->Network in PVE"
 # _green "If vmbr0 and vmbr1 are displayed properly and the Apply Configuration button is grayed out, there is no need to reboot"
@@ -217,4 +212,4 @@ _green "you can test open a virtual machine or container to see if the actual ne
 # _green "虽然已自动设置网关，但不确定是否已成功应用，请查看PVE中的 Datacenter-->pve-->System-->Network"
 # _green "如果 vmbr0 和 vmbr1 已正常显示且 Apply Configuration 这个按钮是灰色的，则不用执行 reboot 重启系统"
 # _green "上述情形如果有不同的，请点击 Apply Configuration 这个按钮，等待几分钟后重启系统，确保网关已成功应用"
-_green "你可以测试开一个虚拟机或者容器看看就知道是不是实际网络已应用成功了"
+_green "你可以测试开一个虚拟机或者容器看看就知道是不是实际网络已应用成功了"
\ No newline at end of file