Prevent brute force attacks using fail2ban
fail2ban monitors log files such as /var/log/auth.log and /var/log/apache/access.log and temporarily or persistently bans failure-prone addresses by updating existing firewall rules. Currently, by default, fail2ban supports ssh/apache/vsftpd but configuration can be easily extended for monitoring any other ASCII file.
1. Install fail2ban
apt-get install fail2ban
Installing and configuring PPTP VPN server on lenny
If you would like to setup a Virtual Private Network (VPN) for Windows clients, PPTP is a great choice. It's easy to set up on the server and you don't need any additional software for the Windows clients to connect.
1. Install the required packages
apt-get install pptpd
Port forwarding with iptables
In this tutorial we'll set up a simple port forwarding (NAT) using iptables.
1. Enable ip forward
echo "1" > /proc/sys/net/ipv4/ip_forward
Loading iptables rules on startup
By default iptables is setup on Debian etch but there are no rules configured. In this tutorial we'll configure some rules and load them into iptables on startup.
1. Rules file
Create a new file that will contain a shell script to insert rules into iptables (pico /etc/firewall-rules.sh) and add this content as template:
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