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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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OpenBSD version 4.5 and above made changes in kernel which prevents booting OpenBSD using KVM technology. OpenBSD 4.4 runs with mbbios enabled. However, due to some sort of bug in KVM it does not boots. The workaround is to disable mpbios. This may or may not happen with your installation.

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I‘ve installed keepalived IP failover software as described here. But how do I verify it is working or not?

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How do I find out if my system support Intel – VT / AMD -V hardware virtualization extensions for host CPU using the command line options?

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How do I find out the size of the bss, text segment and data segment for each object or binary file under Linux operating systems?

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Q. I am a brand new user of a Linux iptables and I can’t find how to instruct my iptables to delete or unblock an IP address listed in iptables firewall. I’m using Debian Linux version. Can you help please?

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Q. How do I find out subnet mask on UNIX operating system? Can you tell us the name of command and configuration file to store subnetmask under UNIX? A. A subnetwork/ subnet is a range of logical addresses within the address space that is assigned to an organization. Subnetting is a hierarchical partitioning of the […]

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