如何强制linux DHCP 客户端重新获取IP (dhclient)

Linux Force DHCP client (dhclient) to renew ip address

Linux renew ip command
$ sudo dhclient -r               //release ip 释放IP
$ sudo dhclient                  //获取IP

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http://www.cyberciti.biz/faq/how ... -client-ip-address/

Now obtain fresh IP:
$ sudo dhclient
There is no need to restart network service. Above command should work with any Linux distro such as RHEL, Fedora, CentOS, Ubuntu and others. On a related note you can also try out the following commands:
# ifdown eth0
# ifup eth0
# /etc/init.d/network restart
OR
# /etc/init.d/networking restart

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