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2239 articles
6 easy steps to setup offline two factor authentication in Linux
Configure Google Authenticator with Offline two factor authentication to secure ssh, sudo and su using PAM module pam_google_authenticator.so in RHEL/CentOS 7/8 …
Linux Interview questions and answers for experienced users
Here I have consolidated 29 linux interview questions and answers for experienced professionals working into Linux or System Administrator profile.
5+ nice & renice command examples in Linux [Cheat Sheet]
nice and renice command syntax and examples explained in Linux. Use nice command to start a process with defined priority. Use renice command to change the …
15 usermod command examples in Linux [Cheat Sheet]
usermod command examples in Linux and Unix to modify the attributes of existing users. Change user's primary or secondary groups, home directory, login shell …
15 useradd command examples in Linux [Cheat Sheet]
Multiple examples for useradd command in linux. Create users in Linux and Unix using useradd command.
A complete guide to write your first Ansible Playbook
Ansible playbooks are rrdered lists of tasks, saved so you can run those tasks in that order repeatedly. Playbooks can include variables as well as tasks.
How to troubleshoot TFTP Issues with Wireshark
Not defined, File not found, Access violation, Disk full or allocation exceeded, Unknown transfer ID, Unknown transfer ID, File already exists, No such user, …
Troubleshoot Packet Fragmentation Issues with Wireshark
fragmented ip protocol wireshark udp 17, observe ip fragmentation using tcpdump and wireshark, how to tell if ip datagram is fragmented, wireshark fragment …
Detect Rogue DHCP Server with Wireshark [Step-by-Step]
Step by step instructions to detect rogue dhcp server in the network using wireshark. Introducing a rogue DHCP server to the network can block the clients from …
Configure VRRP using Keepalived and Cisco’s Router with Examples
Virtual Router Redundancy Protocol (VRRP) is an open standard protocol, which has been developed by IEEE (Institute of Electrical and Electronics Engineers).
Decrypt RDP Traffic with Wireshark and Frida [Step-by-Step]
RDP can be vulnerable especially when Native RDP is used, which is protected by Standard RDP Security layer. CredSSP with NLA is the best option to go with.
Setup FreeRADIUS: LDAP Authentication and Authorization
In this tutorial we will explore step by step instructions to configure freeradius with LDAP and test authentication, authorization using wireshark
Configure and Test FreeRADIUS PAP & CHAP Authentication
Step by step instructions to install and configure freeradius PAP and CHAP authentication with examples.
Setup PEAP-Mschapv2 Authentication with NPS (Part 3)
Protected EAP (PEAP) needs a certificate and TLS support. Thus, I will install "Active Directory Certificate Services" role.
How to setup and test AAA with NPS Server (Part 2)
After installing NPS and configuring the NAS (router) in Part 1, we will set up NPS for authentication, authorization, and accounting services.