DoS Attack Detection In Linux
You can simply use netstat command to print out a list of all open connection to your Linux box. The list will be sorted out using sort command including total number of connections from a specific IP address.
Login as the root user and type the following command,
# netstat -ntu | awk ‘{print $5}’ | cut -d: -f1 | sort | uniq -c | sort -n
Disable The Ping Response On Linux?
Sometimes you may want to disable ping response for many reasons, may be for a security reason… This article explains how do I disable the ping response on Linux ?
Disable ping response Temporarily
To disable the PING response, login as root and type the following command
# echo 1 >/proc/sys/net/ipv4/icmp_echo_ignore_all
To reenable the PING response do this:
# echo 0 >/proc/sys/net/ipv4/icmp_echo_ignore_all
Disable ping response Permanently
Edit the /etc/sysctl.conf file and add the following line
net.ipv4.conf.icmp_echo_ignore_all = 1
Execute sysctl -p to enforce this setting immediately
# sysctl -p
System Information Command
01. Print all information
[root@daddylinux~]# uname –a
02. Print the kernel name
[root@daddylinux~]# uname –s
03. Print the network node hostname
[root@daddylinux~]# uname –n
04. Print the kernel release
[root@daddylinux~]# uname -r
05. Print the kernel version
[root@daddylinux~]# uname -v
