Can’t ping localhost in Linux | $ ping localhost ping: unknown host localhost If you ever find yourself in a situation where you cannot ping localhost, I’ll show you a few things to check! /etc/hosts Verify that the /etc/hosts file has entires for localhost which looks like the following: 127.0.0.1 localhost ::1 localhost ip6-localhost ip6-loopback /etc/nsswitch.conf The file /etc/nsswitch.conf requires specific
Quick nmap How-To
Quick nmap How-To | nmap or network mapper is an open source command line program for security auditing. Here is a basic intro! As always, only scan your own hosts or hosts that you have permission to scan! To do a simple check of open ports or port filtering, issue: $ sudo nmap host stmiller@brahms:~$ sudo nmap scottlinux.com Starting
Clear or Flush Arp Cache in OS X
Clear or Flush Arp Cache in OS X | To clear or delete the arp cache in Mac OS X, crack open a terminal and issue the following command: $ sudo arp -a -d Done! Thanks Theo
How To Create Ethernet RJ45 Loopback Adapter
How To Create Ethernet RJ45 Loopback Adapter | I’ll show you how to create an ethernet loopback adapter! A loopback adapter is useful for tricking a network card into believing it is plugged into a network. Using two wires, connect: 1 to 3 2 to 6 The pin arrangement is 1-8 left to right, with the flat side facing you. Here are some
Detect Network Cable Link in Linux
Detect Network Cable Link in Linux | To check for the presence of a network link, use the command ethtool. For example, this checks eth0: # ethtool eth0 or $ sudo ethtool eth0 Look for a line which says ‘Link detected: yes / no’. The exact output may vary depending on your Linux distribution. Debian / Ubuntu looks like this: Red Hat
