Archive for the 'Networking' Category
- How To Secure Home Wi-Fi ( Wireless ) Network
Describes some common wireless security tips for Windows, Linux, Game console and PDAs for home wifi network.
- Download of the Day: OpenSSH Server 5.0 ( security fix release )
One of the most popular remote server management service has just released security fix version. This version avoid possible hijacking of X11-forwarded connections by refusing to listen on a port unless all address families bind successfully. You can download OpenSHH Server from official project web site or wait for your distro to release updated [...]
- Remote Linux / UNIX / Windows Server Management With KVM over IP
KVM (Keyboard, Video, Mouse) is a switch or hardware device allows a single keyboard, video monitor and mouse to control more than one server one at a time. KVM can be local device or remote device working over IP network. KVM devices extensively used in server farms where it is only necessary to periodically access [...]
- Linux Failed Login Control: Lock and Unlock User Accounts Using PAM
How do I lock out a user after a set number of login attempts in Linux but also automatically unlock it after N minutes?
- Load Balancer Open Source Software
I’ve worked with a various load balancing systems (LBS). They are complex pieces of hardware and software. In this post I will highlight some of the open source load balancing software. But what is load balancing?
It is nothing but a technique used to share (spared) load / services between two or more servers. For [...] - Display IP Address Allocation Table According to Subnet Mask
If you need a tabular representation of relationships and source of the various variables representing a chunk from /32 to /0 subnets use iptab command. This is useful if you are allocating IPs to end users. Following information is displayed with the command:
=> CIDR notation
=> Network Mask
=> Available Networks
=> Available Hosts per [...] - Quagga: Linux Dynamic Routing Software
I’ve already written about Linux static routing configuration. However, sometime you need to configure Linux routers dynamically to get changes of network connections by communicating information about which networks each router can reach and how far away those networks are. These days most network admin prefer to use OSPF or BGP over RIP. Linux [...]
- Get Detailed Information About Particular IP address Connections Using netstat Command
netstat command and shell pipe feature can be used to dig out more information about particular IP address connection. You can find out total established connections, closing connection, SYN and FIN bits and much more. You can also display summary statistics for each protocol using netstat.
This is useful to find out if your server is [...] - Chroot in OpenSSH / SFTP Feature Added To OpenSSH
For regular user accounts, a properly configured chroot jail is a rock solid security system. I’ve already written about chrooting sftp session using rssh. According to OpenBSD journal OpenSSH devs Damien Miller and Markus Friedl have recently added a chroot security feature to openssh itself:
Unfortunately, setting up a chroot(2) environment is complicated, fragile and [...] - Linux Configure WPA2 for RT61 based Wireless Card
I’ve already written about configuring and using DLink wireless card with the help of RT61 driver. However, few readers like to know more about Wi-Fi Protected Access (WPA and WPA2) secure wireless configurations.
Step # 1: Configure Router / AP with WPA2 Security Mode
First you need to configure WPA2 security mode on the access point. [...]
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