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Set Default iptables Policy for Incoming Packets To set the default policy to DROP (instead of ACCEPT) for the built-in INPUT chain which processes incoming packets, add or correct the following line in '/etc/sysconfig/iptables': ':INPUT DROP [0:0]'

Record attempts to alter time through settimeofday If the 'auditd' daemon is configured to use the 'augenrules' program to read audit rules during daemon startup (the default), add the following line to a file with suffix '.rules' in the directory '/etc/audit/rules.d': '-a always,exit -F arch=b32 -S settimeofday -k audit_time_rules' If the system is 64 bit then also add the following line: '-a al ...

Set Daemon Umask The file '/etc/init.d/functions' includes initialization parameters for most or all daemons started at boot time. The default umask of 022 prevents creation of group- or world-writable files. To set the default umask for daemons, edit the following line, inserting 022 or 027 for

Set Default iptables Policy for Forwarded Packets To set the default policy to DROP (instead of ACCEPT) for the built-in FORWARD chain which processes packets that will be forwarded from one interface to another, add or correct the following line in '/etc/sysconfig/iptables': ':FORWARD DROP [0:0]'

Uninstall talk Package The 'talk' package contains the client program for the Internet talk protocol, which allows the user to chat with other users on different systems. Talk is a communication program which copies lines from one terminal to the terminal of another user.

Enable Logging of All FTP Transactions Add or correct the following configuration options within the 'vsftpd' configuration file, located at '/etc/vsftpd/vsftpd.conf': xferlog_enable=YES xferlog_std_format=NO log_ftp_protocol=YES

Disable Kernel Parameter for Accepting Source-Routed Packets for All Interfaces To set the runtime status of the 'net.ipv4.conf.all.accept_source_route' kernel parameter, run the following command:

Disable Accepting IPv6 Router Advertisements To set the runtime status of the 'net.ipv6.conf.default.accept_ra' kernel parameter, run the following command:

Uninstal rsh Package The 'rsh' package contains the client commands for the rsh services

Disable anacron Service The 'cronie-anacron' package, which provides 'anacron' functionality, is installed by default. The 'cronie-anacron' package can be removed with the following command: '$ sudo yum erase cronie-anacron'


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