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when i type 'ifconfig eth0 192.168.25.1 255.255.255.0' the outcome is 'SIOCSIFADDR : invalid argument', but when i check the ip address using /sbin/ifconfig i see the ip address is updated to 192.168.25.1 and is up. When i restart the linux box,the /sbin/ifconfig is reset to 192.168.100.1 .what should i do so that the linux box /sbin/ifconfig should not change when am rebooting.
Thank you for your helping answer in advance.
I'm also not that familiar with networking so this is what I would use to find the file that contains the ip address that is used at boot. Replace the IP address that is defined in those files by the new one.
Are you really using "Red Hat 9"? Quoting from wikipedia: Red Hat Linux 9, the final release, hit its official end-of-life on 2004-04-30 If you really are using a re revision this old, you are both setting yourself up for serious security issues and focusing on learning deprecated techniques. If you want the "red hat" experience without paying for RHEL, go with either Fedora or CentOS.
Here is a link to the CentOS documentation, chapter 14 provides information on configuring the network. BTW, CentOS is the free version Red Hat and may be a little bit behind, but should achieve your goals.