View source for Kernel Hack

There are several useful kernel flags you can set to increase your default network security without using IP Tables.  The /proc filesystem is a window into various parts of the Linux kernel.  Some of these values in the running kernel are read-only, others may be modified on the fly.

Kernel entries made on the fly do not apply after a reboot. Some proc entries have a value of either 0 or 1, while others have character string values.

=== View current hostname: ===
	
	cat /proc/sys/kernel/hostname

=== Change the current hostname instantly: ===

	echo 'newhostname' > /proc/sys/kernel/hostname

=== Enable IP Forwarding:  (echo 0 disables) ===

	echo 1 > /proc/sys/net/ipv4/ip_forward

=== To turn off answers to icmp_echos (such as ping):  (echo 0 turns back on) ===

	echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_all

 
 
 
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*Sat Jul 12 16:17:01 CDT 2003

 
 
 
[[Category:Computer_Technology]]
[[Category:Linux]]