tutorial 9ku

tutorial - How to Ignore ping request

To turn answers to icmp_echos (ping) off, as root type:

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

and to turn it on again type:

echo 0 > /proc/sys/net/ipv4/icmp_echo_ignore_all

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source:http://linuxpoison.blogspot.com/2008/03/13578175809479.html

tutorial - Hide DNS server (BIND) version from others

DNS server is one of the most targeted application for attack, It’s always a good idea to hide your DNS server version information so that BAD guys cannot view the version and start the attack to this specific version of your DNS server (Bind).

To hide your version of bind, add the following value to named.conf in the options section section as follows:

options {
directory “/var/named”;
version “[SECURED]”;
};

source:http://linuxpoison.blogspot.com/2008/03/13578175804848.html

tutorial - How to compile & execute C programs under Linux

Once you have written and saved your C program using any editor return to the prompt. An “ls” command should display your C program. It should have the .c extension. Now at the prompt type the following

$ gcc -o firstprogram firstprogram.c

If your file is named firstprogram.c then type ‘-o firstprogram’ as the parameter to gcc. This is basically your suggested name for the executable file that gcc would create. In case you typed something like the following

$ gcc firstprogram.c

You would be having a a.out in the same directory as the source C file. This is the default name of the executable that gcc creates. This would create problems when you compile many programs in one directory. So you override this with the -o option followed by the name of the executable

$ gcc -o hello secondprogram.c

Would create an executable by the name hello for your source code named secondprogram.c
Running the executable that you created is as simple as typing the following at the prompt.

$ ./firstprogram
OR
$ ./hello

Or whatever you named your executable.

source:http://linuxpoison.blogspot.com/2008/03/13578175802340.html