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Script to find memory usage on Ubuntu

This simple script will show the total memory, free memory and percentage of memory used. Have tested it on Ubuntu 14/16 but will work on CentOS as well #!/bin/bash freemem=$(($(free -m |grep "buffers/cache:"|awk '{print $4}'))) totalmem=$(($(free -m |awk 'NR==2 {print $2}'))) usage=$(($totalmem-$freemem)) echo "Memory used: $usage" echo "Total memory: $totalmem" usage=$(($usage*100 / $totalmem)) echo "Usage percentage: $usage" echo "Free memory: $freemem" echo "$TIMESTAMP $totalmem $usage $freemem"
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Outside NAT script on Linux

/sbin/ifconfig eth1:1 202.141.240.174 netmask 255.255.255.248 /sbin/ifconfig eth1:1 up /sbin/iptables -t nat -A PREROUTING -j DNAT -d 202.141.240.174 --to-destination 192.168.0.22 /sbin/iptables -t nat -A POSTROUTING -j SNAT -s 192.168.0.22/32 -d 0/0 --to-source 202.141.240.174 Another useful link http://home1.gte.net/res0psau/security/nat-on-linux.html http://www.cyberciti.biz/faq/linux-demilitarized-zone-howto/
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What is a SIEM solution

  What is a SIEM solution I am updating my blog after quite a while and will try to talk about Cyber Security. In today’s blog we are going to talk about a term used commonly in Cyber Security, which is SIEM. SIEM stands for “Security Incident and Event Management” It is a combination of security information management and security event management. SIEM keeps track of the security posture of an organization by collecting security related data of information an organization in form of logs and store them for analysis for upcoming threats and it also monitors the infrastructure of an organization (both on premises and cloud based.) There are different SIEM solutions offered, some of the common and popular ones are Rapid7, Sentinel One, Splunk, ActZero. Most of these solutions can also integrate with next generation EDR/XDR/MDR solutions like Crowd Strike as well. SIEM is the center of organizations security operations (SOC).  Some of the salient features of a...
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