In common situation, "system ip address" is the ETH0 address. So edit /etc/sysconfig/network-scripts/ifcfg-eth0 with your favourite text editor and run service network restart ps don't forget to change default gw also, it's located in /etc/sysconfig/network.
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Reality is that the WIFI protocol was designed to go as slow as required to make it still work!
Please use this link to calculate IP Subnet
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