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ROOT ‹ FreeBSD, Linux and AIX ‹ TCP/IP Networking ‹ How to block ping icmp echo requests without a firewall in Linux

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How to block ping icmp echo requests without a firewall in Linux

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debuser

Post subject: How to block ping icmp echo requests without a firewall in Linux | Posted: Mon Nov 26, 2012 9:46 am

Joined: Thu Aug 06, 2009 2:48 am
Posts: 105

How to block ping icmp echo requests without a firewall in Linux

To stop all icmp echo-request packets in Linux without enabling a firewall use the following sysctl:

Code:

# sysctl net.ipv4.icmp_echo_ignore_all=1
net.ipv4.icmp_echo_ignore_all = 1

To check:

Code:

# tcpdump -nni eth0 icmp

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