>
> here when I check the network settings the subnet mask is
> changed to 192.168.1.1 ???
>
> address: 192.168.1.2
> subnet mask: 192.168.1.1
> default gateway: 192.168.1.1
>
> this is really strange !
>
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subnet mask was set wrong in /etc/sysconfig/network-scripts/ifcfg-eth0
once corrected problem was solved.