A quick and usefull command for checking if a server is under ddos is: netstat -anp |grep ‘tcp\|udp’ | awk ‘{print $5}’ | cut -d: -f1 | sort | uniq -c | sort -n
What is a null route? A null route is a route that goes to nowhere. The reason for creating a null route is to prevent your system from sending any data to a remote system.