Put TUN down on client disconnect.

On startup client creates TUN interface in UP state and kept it UP even
if connection to the server was lost. Creating interface in DOWN state,
turning it UP on successful (re-)connection to server and DOWN on either
disconnect or connection loss would enable DHCP client (say dhclient5)
to detect necessity for lease renewal.

Added a client configuration parameter to create TUN interface in DOWN
state and commands to enable, disable, and query the configuration
parameter.
Enabling the parameter causes client to put all unused TUN interfaces
DOWN, create new TUN interfaces in DOWN state, and turn TUN interfaces
corresponding to active sessions DOWN on connection loss or
disconnecting from server.
Disabling the parameter forces client to turn all TUN interfaces UP and
create new TUN interfaces in UP state.
Default value is 'Disable'.

src/bin/hamcore/strtable_cn.stb

@@ -4686,6 +4686,21 @@ CMD_ServerCipherSet_Args	ServerCipherSet [name]
 CMD_ServerCipherSet_[name]	指定设置加密和数字签名的程序。可以使用的程序一览，可以从 ServerCipherGet 指令中获取。
 CMD_ServerCipherSet_PROMPT_NAME	指定的加密程序的名称: 
 
+# TUNDownOnDisconnectEnable command
+CMD_TUNDownOnDisconnectEnable	Enable the Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectEnable_Help	This allows you to enable Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectEnable_Args	TUNDownOnDisconnectEnable
+
+# TUNDownOnDisconnectDisable command
+CMD_TUNDownOnDisconnectDisable	Disable the Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectDisable_Help	This allows you to disable Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectDisable_Args	TUNDownOnDisconnectDisable
+
+# TUNDownOnDisconnectGet command
+CMD_TUNDownOnDisconnectGet		Get status of the Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectGet_Help	This allows you to get status of the Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectGet_Args	TUNDownOnDisconnectGet
+CMD_TUNDownOnDisconnectGet_COLUMN1	Put TUN down on disconnect
 
 # KeepEnable 命令
 CMD_KeepEnable				启动 Internet 保持连接功能

src/bin/hamcore/strtable_en.stb

@@ -4669,6 +4669,21 @@ CMD_ServerCipherSet_Args	ServerCipherSet [name]
 CMD_ServerCipherSet_[name]	This specifies the encrypted and electronic signature algorithm to set. You can obtain the list of usable algorithms by using the ServerCipherGet command.
 CMD_ServerCipherSet_PROMPT_NAME	Encrypted Algorithm Name to Specify: 
 
+# TUNDownOnDisconnectEnable command
+CMD_TUNDownOnDisconnectEnable	Enable the Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectEnable_Help	This allows you to enable Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectEnable_Args	TUNDownOnDisconnectEnable
+
+# TUNDownOnDisconnectDisable command
+CMD_TUNDownOnDisconnectDisable	Disable the Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectDisable_Help	This allows you to disable Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectDisable_Args	TUNDownOnDisconnectDisable
+
+# TUNDownOnDisconnectGet command
+CMD_TUNDownOnDisconnectGet		Get status of the Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectGet_Help	This allows you to get status of the Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectGet_Args	TUNDownOnDisconnectGet
+CMD_TUNDownOnDisconnectGet_COLUMN1	Put TUN down on disconnect
 
 # KeepEnable command
 CMD_KeepEnable			Enable the Keep Alive Internet Connection Function

src/bin/hamcore/strtable_ja.stb

@@ -4671,6 +4671,21 @@ CMD_ServerCipherSet_Args	ServerCipherSet [name]
 CMD_ServerCipherSet_[name]	設定するる暗号化および電子署名アルゴリズムを指定します。使用可能なアルゴリズムの一覧は、ServerCipherGet コマンドで取得することができます。
 CMD_ServerCipherSet_PROMPT_NAME	指定する暗号化アルゴリズム名: 
 
+# TUNDownOnDisconnectEnable command
+CMD_TUNDownOnDisconnectEnable	Enable the Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectEnable_Help	This allows you to enable Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectEnable_Args	TUNDownOnDisconnectEnable
+
+# TUNDownOnDisconnectDisable command
+CMD_TUNDownOnDisconnectDisable	Disable the Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectDisable_Help	This allows you to disable Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectDisable_Args	TUNDownOnDisconnectDisable
+
+# TUNDownOnDisconnectGet command
+CMD_TUNDownOnDisconnectGet		Get status of the Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectGet_Help	This allows you to get status of the Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectGet_Args	TUNDownOnDisconnectGet
+CMD_TUNDownOnDisconnectGet_COLUMN1	Put TUN down on disconnect
 
 # KeepEnable コマンド
 CMD_KeepEnable			インターネット接続の維持機能の有効化

src/bin/hamcore/strtable_ko.stb

@@ -4666,6 +4666,21 @@ CMD_ServerCipherSet_Args ServerCipherSet [name]
 CMD_ServerCipherSet_ [name] 설정해야 루루 암호화 및 전자 서명 알고리즘을 지정합니다. 사용 가능한 알고리즘 목록은 ServerCipherGet 명령에서 얻을 수 있습니다.
 CMD_ServerCipherSet_PROMPT_NAME 지정하는 암호화 알고리즘 명:
 
+# TUNDownOnDisconnectEnable command
+CMD_TUNDownOnDisconnectEnable	Enable the Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectEnable_Help	This allows you to enable Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectEnable_Args	TUNDownOnDisconnectEnable
+
+# TUNDownOnDisconnectDisable command
+CMD_TUNDownOnDisconnectDisable	Disable the Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectDisable_Help	This allows you to disable Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectDisable_Args	TUNDownOnDisconnectDisable
+
+# TUNDownOnDisconnectGet command
+CMD_TUNDownOnDisconnectGet		Get status of the Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectGet_Help	This allows you to get status of the Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectGet_Args	TUNDownOnDisconnectGet
+CMD_TUNDownOnDisconnectGet_COLUMN1	Put TUN down on disconnect
 
 # KeepEnable 명령
 CMD_KeepEnable 인터넷 연결 유지 기능 활성화

src/bin/hamcore/strtable_tw.stb

@@ -4686,6 +4686,21 @@ CMD_ServerCipherSet_Args	ServerCipherSet [name]
 CMD_ServerCipherSet_[name]	指定設置加密和數位簽章的程式。可以使用的程式一覽，可以從 ServerCipherGet 指令中獲取。
 CMD_ServerCipherSet_PROMPT_NAME	指定的加密程式的名稱: 
 
+# TUNDownOnDisconnectEnable command
+CMD_TUNDownOnDisconnectEnable	Enable the Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectEnable_Help	This allows you to enable Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectEnable_Args	TUNDownOnDisconnectEnable
+
+# TUNDownOnDisconnectDisable command
+CMD_TUNDownOnDisconnectDisable	Disable the Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectDisable_Help	This allows you to disable Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectDisable_Args	TUNDownOnDisconnectDisable
+
+# TUNDownOnDisconnectGet command
+CMD_TUNDownOnDisconnectGet		Get status of the Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectGet_Help	This allows you to get status of the Turn TUN Interface Down on Client Disconnect Function.
+CMD_TUNDownOnDisconnectGet_Args	TUNDownOnDisconnectGet
+CMD_TUNDownOnDisconnectGet_COLUMN1	Put TUN down on disconnect
 
 # KeepEnable 命令
 CMD_KeepEnable				啟動 Internet 保持連接功能