Ubuntu ifconfig命令怎样设置IP地址租约时间

在 Ubuntu 中，ifconfig 命令本身并不提供直接设置 IP 地址租约时间的功能。租约时间通常是由 DHCP 客户端（如 dhclient）管理的。如果你想更改 IP 地址的租约时间，你需要编辑 DHCP 客户端的配置文件。

以下是如何在 Ubuntu 中更改 DHCP 租约时间的步骤：

1. 打开终端。

2. 编辑 DHCP 客户端配置文件： 通常，DHCP 客户端的配置文件位于 /etc/dhcp/dhclient.conf。你可以使用文本编辑器（如 nano 或 vim）来编辑这个文件。例如，使用 nano 编辑器：

   sudo nano /etc/dhcp/dhclient.conf
   

3. 添加或修改租约时间参数： 在 dhclient.conf 文件中，你可以添加或修改以下行来设置租约时间：

   send dhcp-requested-address <IP_ADDRESS>;
   supersede domain-name-servers <DNS_SERVERS>;
   request subnet-mask, broadcast-address, time-offset, routers,
           domain-name, domain-name-servers, domain-search, host-name,
           netbios-name-servers, netbios-scope, interface-mtu,
           rfc3442-classless-static-routes, ntp-servers;
   option classless-static-routes code 121 = array of unsigned integer 8;
   option classless-static-routes length 4;
   option classless-static-routes 0, 0, 0, 0;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <BROADCAST_ADDRESS>;
   option time-offset <TIME_OFFSET>;
   option routers <ROUTER_IP>;
   option subnet-mask <SUBNET_MASK>;
   option domain-name-servers <DNS_SERVERS>;
   option domain-name <DOMAIN_NAME>;
   option broadcast-address <