Mac OS X: Wake Up Servers Using Wake-on-LAN ( WOL ) Command Utility

I know how to send WOL command using Linux or FreeBSD wake command. But, how do I send Wake on LAN (WOL) frames to hosts on a local Ethernet network using Apple OS X Unix…

Linux: Find Out What Is Using TCP Port 80

H ow do I find out what is listing or using tcp port number 80 on Linux based systems using command line options?   You can use any one of the following command to find…

CentOS / RHEL: Install iftop To Display Bandwidth Usage Per interface By Host

I am running Red Hat Enterprise Linux on IBM based system. How do I display bandwidth usage on an interface by host in real time using command line option? How do I monitor bandwidth usage…

OpenBSD: Reload / Restart / Stop dhcpd Server Command

I manage MS-Windows server and recently started to play with OpenBSD server. How do I reload or restart the dhcpd server on OpenBSD using shell command line option?   If you made changes to the…

Increase NFS Client Mount Point Security For a Web-Server noexec, nosuid, nodev Options

I am using NFS server version 4.x on a CentOS/RHEL based system. I’m mounting my shared /var/www/ directory on five Apache based nodes using the following syntax: mount -t nfs4 -o rw,intr,hard,proto=tcp rocknas02:/httproot/www /var/www/ I…

Linux: Log Suspicious Martian Packets / Un-routable Source Addresses

I run a web-server and I would like to log packets with un-routable source addresses on Linux operating system. How can I log spoofed packets on Debian / Ubuntu / CentOS / RHEL / Linux…

curl Command Resume Broken Download

I know wget can resume a failed download. I am on a Mac OS X and do now want to install wget command. How can I resume a failed download using curl command on Linux…

Fedora Linux 20: Install Broadcom-wl STA BCM43228 Wireless Driver

I ‘m using Dell / Lenovo laptop with Broadcom’s IEEE 802.11a/b/g/n based wireless card. How can I install Broadcom-wl STA BCM4322 Wireless driver on a Fedora Linux version 20?   Broadcom’s IEEE 802.11a/b/g/n driver can…

CentOS / RHEL 7 Restart / Stop / Start Networking Command

I recently installed CentOS Linux version 7 or Red Hat Enterprise Linux version 7. How can I restart networking service using command line options? How can I start / stop and restart networking service on…

FreeBSD Force DHCP Client (dhclient) to Renew IP Address To Get A New Lease

I have a Linux DD-WRT router DHCP server running on my network. How can I force my FreeBSD based dhcp client to get a new lease from this Linux based router? What is the command…