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router

I need to do router or network switch configuration via a console port such as COM1 (ttyS0 under Linux). How do I use the screen command for a serial terminal emulator network with different baud rates under UNIX or Linux operating systems?
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How do I send gratuitous ARPs under Linux? How do I tell my DUMMY router that the IP is over here now, under Linux operating systems?
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Linux Kernel /etc/sysctl.conf Security Hardening

How do I set advanced security options of the TCP/IP stack and virtual memory to improve security and performance of my system? How do I configure Linux kernel to prevent certain kinds of attacks using /etc/sysctl.conf? How do I set Linux kernel parameters?
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CentOS / Red Hat Linux IP Forwarding How To

How do I enable IP forwarding under RHEL / Red Hat / Fedora / CentOS Linux operating systems?
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