Why need reboot the server when give a new IP Address in Centos 6.3 ?
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We have no idea HOW you are adding a new address, you've told us nothing useful about this. However, you must be doing something wrong though, as there should never ever be a need to reboot for something like that. Update the entry in the ifcfg-eth0 file and and a "ifdown eth0; ifup eth0" should have it all put into place.
I forget what it is called but most distro's say after you change settings like that you need to restart network manager or services. A reboot would do that but pretty sure it can be done from command line. A RH person ought to know exact command to do that.