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When installing my system I accidentally set my default gateway to the wrong address, so the first thing i did when i booted up was to delete the old gateway
I had this problem at one point and I was able to fix it. Not sure exactly why, but if you go to System Settings --> Server Settings --> Services and look for an item near the top called 'Network Manager', you can make sure it's checked. Mine was not checked, and as soon as I checked it, the problem went away. If it's not checked, check it and make sure to click the Save icon before closing the window.
You can check services from the command line with /sbin/chkconfig.
For what it's worth, I'm using FC4 and I am not running Network Manager and I don't seem to have any problem with it forgetting about my default gateway.
In al versions of RedHat I have had access to, and I believe Fedora Core 3 to be Redhat, the gateway is set in /etc/sysconfig/network which is a plain text file and has a field like
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