Tag archive for ‘Security’

Linux Iptables Just Block By Country

I admin ecom website and a lot of bogus traffic comes from countries that do not offer much in commercial value. How do I just configure Apache or iptables to just refuse connections to certain countries? You can block traffic at both Apache or iptables level. I recommend iptables to save some resources. First, you [...]

Icinga (Monitoring Solution) Installation And Configuration On CentOS

Icinga is an enterprise grade open source monitoring system which keeps watch over networks and any conceivable network resource, notifies the user of errors and recoveries and generates performance data for reporting. Scalable and extensible, Icinga can monitor complex, large environments across dispersed locations. I am going with the Icinga basic installation and this is [...]

Managing A Single Firewall Policy For Multiple Servers Using Firewall Builder

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 [...]

VPS iptables rule limit is too low

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 [...]

How To Install OCS Inventory NG Server 2 On CentOS 5.5

Introduction OCS Inventory is a great software to make inventories. The NG Server is formed by: communication server, deployment server, and administration console. Click here to know how it works. The computers that will be inventoried must run an agent (installed on each computer), to connect to the OCS NG Server. We are using the [...]

FreeBSD ipfw Traffic Shaping Firewall Script

# 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=”,,″ 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 [...]

Host Based Intrusion Detection – Samhain

I am not going to ramble on about what host based intrusion detection is or why to use it, as there are plenty of articles already covering those subjects. This article is just to show you how to get Samhain up and running in a client / server configuration with a couple bells and whistles [...]

Server Securing

Securing Your Server Below given are some of the steps that can be used to secure your server. Disable identification output for Apache To disable the version output for proftp, SSH into server and login as root. At command prompt type: pico /etc/httpd/conf/httpd.conf Scroll (way) down and change the following line to ServerSignature Off Restart [...]

Linux: 20 Iptables Examples For New SysAdmins

Linux comes with a host based firewall called Netfilter. According to the official project site: netfilter is a set of hooks inside the Linux kernel that allows kernel modules to register callback functions with the network stack. A registered callback function is then called back for every packet that traverses the respective hook within the [...]

Top 10 ways to stop spam in WordPress

Spam is a nuisance, and as bloggers, we have all experienced a flood of spam every now and then. Not only is it a pain, but it can slow down your blog and use up your resources. In this post we’ll look at ten ways to combat spam. 1. Install Akismet This is the simple [...]

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