1. Issuing [tt]uname -r[/tt] will tell you what revision of the kernel you are running. If you installed the kernel from an rpm, then [tt]rpm -q kernel[/tt] will tell you what kernel revisions are available on the system.
2. You don't. RedHat isn't patching RH9.0 any more. If you want a RedHat-like Linux distribution which is begin patched, try Fedora.
3. There has been a firewall built into the Linux kernel for quite some time now. Older Linux kernels used a technology called ipchains. Newer ones use iptables. RH9 should have iptables available.
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