http://www.fwbuilder.org Firewall Builder is a firewall configuration and management GUI that supports configuring a wide range of firewalls from a single application. Supported firewalls include Linux iptables, BSD pf, Cisco ASA/PIX, Cisco router access lists and many more. The complete list of supported platforms along with downloadable binary packages and soure code can be found [...]

The default firewall that comes along with Linux is “iptables” and you can use iptables to block Ftp access/port on your server. Completely block Ftp access on the server: # iptables -A INPUT -p tcp –dport 21 -j DROP Block Ftp access for a specific IP address, say 11.12.13.14 # iptables -A INPUT -p tcp [...]

If you are looking to change the Ftp port on your server from 21 to a non-standard port say 2121, you need tweak the ‘bind’ option in the Ftp configuration file.  On a cPanel server with pure-ftp as a Ftp server, you need to edit the pure-ftpd.conf file # pico /etc/pure-ftpd.conf Search for the line: [...]

You may have notice packet drops when CSF firewall is enabled and you are downloading something. The only reason is the option PACKET_FILTER = “1″ By default the “PACKET_FILTER” is ON which drops packets that looks illegal or out of sequence. If it’s generating false alarms and causing the valid packet to drop, you should [...]

You may come across with a “numiptent” error message while restarting iptables or whatever firewall (say csf) you have installed on your VPS. The error appear as follows: The VPS iptables rule limit (numiptent) is too low (200/250) – stopping firewall to prevent iptables blocking all connections There is a limit on the number of [...]

Media Access Control address (MAC address) or Ethernet Hardware Address (EHA) or hardware address or adapter address is a quasi-unique identifier attached to most network adapters (NICs). It is a number that acts like a name for a particular network adapter, so, for example, the network cards (or built-in network adapters) in two different computers [...]

You may come across with a “numiptent” error message while restarting iptables or whatever firewall (say csf) you have installed on your VPS. The error appear as follows: The VPS iptables rule limit (numiptent) is too low (200/250) – stopping firewall to prevent iptables blocking all connections There is a limit on the number of [...]

The following is a guide to installing ConfigServer Services‘ firewall and login failure daemon. Warning: The Latest version of CSF does not work properly with DirectAdmin on CentOS 5 machines with Apache 2+ CSF + LFD is a full security suite. I have provided a list of the features that I have personally tested and [...]

# Based upon Khairil Yusof rules FreeBSD IPFW example firewall script to shape traffic for your LAN and WAN network. #firewall command fwcmd=”/sbin/ipfw” #interfaces wifi=ath0 wire=fxp0 oif=tun0 vpn=tun1 internal=”10.1.1.0/24,192.168.1.0/24,192.168.3.0/24″ fw=”skipto 1000″ nat_in=”skipto 2000″ nat_out=”skipto 5000″ cs=”skipto 3000″ # Force a flushing of the current rules before we reload. $fwcmd -f flush #Setup incoming and outgoing [...]