Disable reply to ping
Answer:
To stop other machine from pinging your machine, you the following command
# sysctl -w net.ipv4.icmp_echo_ignore_all=1
To turn it on again:
# sysctl -w net.ipv4.icmp_echo_ignore_all=0
Mar 042010
How to get the IP address assigned to eth0 by a single command
Answer:
Only a single command is needed to return only the IP address assigned to eth0:
# echo $(ifconfig eth0 | awk -F: '/inet addr:/ {print $2}' | awk '{ print $1 }')
58.23.182.42
Jan 072010
Disable IPv6 in Linux
Answer:
To disable IPv6 during boot time.
1. edit /boot/grub/menu.lst
# sudo vi /boot/grub/menu.lst
2. append the following line at the end of your targeted kernel, save the file.
ipv6.disable=1
3. Restart your system and verify to see it is now disabled (The following command should return nothing)
# ip a | grep inet6
