diff --git a/docs/manage-users-zh.md b/docs/manage-users-zh.md
index e44084a..9c8cd32 100644
--- a/docs/manage-users-zh.md
+++ b/docs/manage-users-zh.md
@@ -58,9 +58,9 @@ wget -O add_vpn_user.sh https://bit.ly/addvpnuser
 ```bash
 # 所有变量值必须用 '单引号' 括起来
 # *不要* 在值中使用这些字符：  \ " '
-sudo sh add_vpn_user.sh '要添加的用户名' '密码'
+sudo sh add_vpn_user.sh '要添加的用户名' '密码' 'IP'
 # 或者
-sudo sh add_vpn_user.sh '要更新的用户名' '新密码'
+sudo sh add_vpn_user.sh '要更新的用户名' '新密码' 'IP'
 ```
 
 ### 删除一个 VPN 用户
@@ -95,7 +95,7 @@ wget -O update_vpn_users.sh https://bit.ly/updatevpnusers
 
 ```bash
 nano -w update_vpn_users.sh
-[替换为你自己的值： YOUR_USERNAMES 和 YOUR_PASSWORDS]
+[替换为你自己的值： YOUR_USERNAMES、YOUR_PASSWORDS 和 YOUR_IP_ADDRESSES]
 sudo sh update_vpn_users.sh
 ```
 
@@ -108,6 +108,7 @@ sudo sh update_vpn_users.sh
 sudo \
 VPN_USERS='用户名1 用户名2 ...' \
 VPN_PASSWORDS='密码1 密码2 ...' \
+VPN_IP_ADDRESSES='IP1 IP2 ...' \
 sh update_vpn_users.sh
 ```
 
diff --git a/docs/manage-users.md b/docs/manage-users.md
index 3c94843..582b473 100644
--- a/docs/manage-users.md
+++ b/docs/manage-users.md
@@ -58,9 +58,9 @@ wget -O add_vpn_user.sh https://bit.ly/addvpnuser
 ```bash
 # All values MUST be placed inside 'single quotes'
 # DO NOT use these special characters within values: \ " '
-sudo sh add_vpn_user.sh 'username_to_add' 'password'
+sudo sh add_vpn_user.sh 'username_to_add' 'password' 'ip_address'
 # OR
-sudo sh add_vpn_user.sh 'username_to_update' 'new_password'
+sudo sh add_vpn_user.sh 'username_to_update' 'new_password' 'ip_address'
 ```
 
 ### Delete a VPN user
@@ -95,7 +95,7 @@ To use this script, choose one of the following options:
 
 ```bash
 nano -w update_vpn_users.sh
-[Replace with your own values: YOUR_USERNAMES and YOUR_PASSWORDS]
+[Replace with your own values: YOUR_USERNAMES, YOUR_PASSWORDS and YOUR_IP_ADDRESSES]
 sudo sh update_vpn_users.sh
 ```
 
@@ -108,6 +108,7 @@ sudo sh update_vpn_users.sh
 sudo \
 VPN_USERS='username1 username2 ...' \
 VPN_PASSWORDS='password1 password2 ...' \
+VPN_IP_ADDRESSES='ip1 ip2 ...' \
 sh update_vpn_users.sh
 ```
 
diff --git a/extras/add_vpn_user.sh b/extras/add_vpn_user.sh
old mode 100644
new mode 100755
index 51fd065..b2196f0
--- a/extras/add_vpn_user.sh
+++ b/extras/add_vpn_user.sh
@@ -41,19 +41,20 @@ fi
 
 VPN_USER=$1
 VPN_PASSWORD=$2
+VPN_IP_ADDRESS=$3
 
-if [ -z "$VPN_USER" ] || [ -z "$VPN_PASSWORD" ]; then
+if [ -z "$VPN_USER" ] || [ -z "$VPN_PASSWORD" ] || [ -z "$VPN_IP_ADDRESS" ]; then
 cat 1>&2 <<EOF
-Usage: sudo sh $0 'username_to_add' 'password_to_add'
+Usage: sudo sh $0 'username_to_add' 'password_to_add' 'ip_address_to_add'
 EOF
   exit 1
 fi
 
-if printf '%s' "$VPN_USER $VPN_PASSWORD" | LC_ALL=C grep -q '[^ -~]\+'; then
+if printf '%s' "$VPN_USER $VPN_PASSWORD $VPN_IP_ADDRESS" | LC_ALL=C grep -q '[^ -~]\+'; then
   exiterr "VPN credentials must not contain non-ASCII characters."
 fi
 
-case "$VPN_USER $VPN_PASSWORD" in
+case "$VPN_USER $VPN_PASSWORD $VPN_IP_ADDRESS" in
   *[\\\"\']*)
     exiterr "VPN credentials must not contain these special characters: \\ \" '"
     ;;
@@ -77,6 +78,7 @@ VPN user to add or update:
 
 Username: $VPN_USER
 Password: $VPN_PASSWORD
+IP address: $VPN_IP_ADDRESS
 
 Write these down. You'll need them to connect!
 
@@ -105,7 +107,7 @@ conf_bk "/etc/ipsec.d/passwd"
 # Add or update VPN user
 sed -i "/^\"$VPN_USER\" /d" /etc/ppp/chap-secrets
 cat >> /etc/ppp/chap-secrets <<EOF
-"$VPN_USER" l2tpd "$VPN_PASSWORD" *
+"$VPN_USER" l2tpd "$VPN_PASSWORD" "$VPN_IP_ADDRESS"
 EOF
 
 # shellcheck disable=SC2016
diff --git a/extras/update_vpn_users.sh b/extras/update_vpn_users.sh
old mode 100644
new mode 100755
index 9d77fd1..bc5d168
--- a/extras/update_vpn_users.sh
+++ b/extras/update_vpn_users.sh
@@ -19,10 +19,12 @@
 
 YOUR_USERNAMES=''
 YOUR_PASSWORDS=''
+YOUR_IP_ADDRESSES=''
 
 # Example:
 # YOUR_USERNAMES='username1 username2'
 # YOUR_PASSWORDS='password1 password2'
+# YOUR_IP_ADDRESSES='ip1 ip2'
 
 # =====================================================
 
@@ -60,8 +62,9 @@ fi
 
 [ -n "$YOUR_USERNAMES" ] && VPN_USERS="$YOUR_USERNAMES"
 [ -n "$YOUR_PASSWORDS" ] && VPN_PASSWORDS="$YOUR_PASSWORDS"
+[ -n "$YOUR_IP_ADDRESSES" ] && VPN_IP_ADDRESSES="$YOUR_IP_ADDRESSES"
 
-if [ -z "$VPN_USERS" ] || [ -z "$VPN_PASSWORDS" ]; then
+if [ -z "$VPN_USERS" ] || [ -z "$VPN_PASSWORDS" ] || [ -z "$VPN_IP_ADDRESSES"]; then
   exiterr "All VPN credentials must be specified. Edit the script and re-enter them."
 fi
 
@@ -71,12 +74,15 @@ VPN_USERS=$(noquotes2 "$VPN_USERS")
 VPN_PASSWORDS=$(noquotes "$VPN_PASSWORDS")
 VPN_PASSWORDS=$(onespace "$VPN_PASSWORDS")
 VPN_PASSWORDS=$(noquotes2 "$VPN_PASSWORDS")
+VPN_IP_ADDRESSES=$(noquotes "$VPN_IP_ADDRESSES")
+VPN_IP_ADDRESSES=$(onespace "$VPN_IP_ADDRESSES")
+VPN_IP_ADDRESSES=$(noquotes2 "$VPN_IP_ADDRESSES")
 
-if printf '%s' "$VPN_USERS $VPN_PASSWORDS" | LC_ALL=C grep -q '[^ -~]\+'; then
+if printf '%s' "$VPN_USERS $VPN_PASSWORDS $VPN_IP_ADDRESSES" | LC_ALL=C grep -q '[^ -~]\+'; then
   exiterr "VPN credentials must not contain non-ASCII characters."
 fi
 
-case "$VPN_USERS $VPN_PASSWORDS" in
+case "$VPN_USERS $VPN_PASSWORDS $VPN_IP_ADDRESSES" in
   *[\\\"\']*)
     exiterr "VPN credentials must not contain these special characters: \\ \" '"
     ;;
@@ -99,20 +105,22 @@ WARNING: ALL existing VPN users will be removed
 
 ==================================================
 
-Updated list of VPN users (username | password):
+Updated list of VPN users (username | password | ip address):
 
 EOF
 
 count=1
 vpn_user=$(printf '%s' "$VPN_USERS" | cut -d ' ' -f 1)
 vpn_password=$(printf '%s' "$VPN_PASSWORDS" | cut -d ' ' -f 1)
-while [ -n "$vpn_user" ] && [ -n "$vpn_password" ]; do
+vpn_ip_address=$(printf '%s' "$VPN_IP_ADDRESSES" | cut -d ' ' -f 1)
+while [ -n "$vpn_user" ] && [ -n "$vpn_password" ] && [ -n "$vpn_ip_address" ]; do
 cat <<EOF
-$vpn_user | $vpn_password
+$vpn_user | $vpn_password | $vpn_ip_address
 EOF
   count=$((count+1))
   vpn_user=$(printf '%s' "$VPN_USERS" | cut -s -d ' ' -f "$count")
   vpn_password=$(printf '%s' "$VPN_PASSWORDS" | cut -s -d ' ' -f "$count")
+  vpn_ip_address=$(printf '%s' "$VPN_IP_ADDRESSES" | cut -s -d ' ' -f "$count")
 done
 
 cat <<'EOF'
@@ -146,10 +154,12 @@ conf_bk "/etc/ipsec.d/passwd"
 count=1
 vpn_user=$(printf '%s' "$VPN_USERS" | cut -d ' ' -f 1)
 vpn_password=$(printf '%s' "$VPN_PASSWORDS" | cut -d ' ' -f 1)
-while [ -n "$vpn_user" ] && [ -n "$vpn_password" ]; do
+vpn_ip_address=$(printf '%s' "$VPN_IP_ADDRESSES" | cut -d ' ' -f 1)
+
+while [ -n "$vpn_user" ] && [ -n "$vpn_password" ] && [ -n "$vpn_ip_address" ]; do
   vpn_password_enc=$(openssl passwd -1 "$vpn_password")
 cat >> /etc/ppp/chap-secrets <<EOF
-"$vpn_user" l2tpd "$vpn_password" *
+"$vpn_user" l2tpd "$vpn_password" "$vpn_ip_address"
 EOF
 cat >> /etc/ipsec.d/passwd <<EOF
 $vpn_user:$vpn_password_enc:xauth-psk
@@ -157,6 +167,7 @@ EOF
   count=$((count+1))
   vpn_user=$(printf '%s' "$VPN_USERS" | cut -s -d ' ' -f "$count")
   vpn_password=$(printf '%s' "$VPN_PASSWORDS" | cut -s -d ' ' -f "$count")
+  vpn_ip_address=$(printf '%s' "$VPN_IP_ADDRESSES" | cut -s -d ' ' -f "$count")
 done
 
 # Update file attributes