Need help about DHCP client

[LiGang]

If my board has a default IP 
(like this: ifconfig wiz0 164.125.71.190 netmask 255.255.255.0 up 
                route add default gw 164.125.71.1 wiz0), 
after starting dhclient, can that default IP automatically update to the IP got from DHCP server?
Thanks!
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