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GSLB: How DNS-based one works
GSLB is short for Global Server Load Balancing, and is a tried and tested way of improving the availability and speed of Internet-based services. GSLB enables distribution of traffic across multiple sites, manages disaster recovery, and ensures that applications are consistently accessible.
Filed in: Networking
Configure network card in promiscuous mode
When running in promiscuous mode, all traffic the network card receives can be read. This configuration is useful for us to do network monitoring, like for a network intrusion detection system.
Filed in: Networking
Using VETH instead of VENET in OpenVZ
Posted by joseph on April 8, 2010 · 2 Comments
By default OpenVZ is using VENET as network device. It does packet switching based on IP header, which makes it look like a point-to-point connection between VPS and the physical host. An alternative device is Virtual Ethernet device (a.k.a. VETH).
Failover Firewalls with OpenBSD and CARP
Warning – this post was original created by Jason Dixon some yrs ago, its copyright is fully held by samag.com. I copied it here for a track record, If there’s any issue, please let me know. As the pictures in this post had lost already, it’s suggested to check its PDF version here.
Firewalls [...]
Filed in: Networking, System Tuning
Set timezone date and time in Linux
Your computer has two timepieces; a battery-backed one that is always running (a.k.a. the hardware, BIOS, or CMOS clock), and another that is maintained by the operating system currently running, it’s called system clock. This document explains how to set your system clock, your timezone, and other [...]
Filed in: Networking, System Tuning
Postfix: Manage transport mapping table
I have some web servers running for productive purpose, and they all have to send out mails. So a problem comes, how can I config mail forwardings for these servers with only internal network to send out mails to the public network?
Luckily it’s easy to implement with the help of either sendmail [...]
Filed in: Networking, System Tuning
13th Workshop on High Performance Transaction Systems
The 13th international workshop on HPTS held at October 25-28, 2009, Pacific Grove, CA. It’s all about real systems problems for real systems builders! The papers are listed at its official website. These papers are really really very informative, it’s suggested to have a read!
Every two [...]
What network issues should be monitored?
Network is the basis of the communication to your customers, page viewers. without network, computers are of no usage at all, arent they? But most of the guys always pay very little attention to the health of their networks. Generally, there are some type of networks issues should special pay attention:
Filed in: Networking, System Tuning
Common wget usage examples
Wget is one of my favorite tools in Linux/Unix world. Sometimes, you want to download all the rpm, deb, iso, or tgz files and save them into a directory. Sometimes you need to use it to check your web server status. Here are some of my favorite wget usage examples:
$ wget -i filename.txt
Put the URLs [...]
Filed in: Applications, Networking
Setup OpenVPN in one minute
This article will guide you on creating a client-2-server OpenVPN instance. Our goal is to redirect all client traffic to VPN server. That means VPN server would serve as a gateway for local traffic. It’s useful to bypass some STUPID National firewalls,or to test IP-restricted applications.
Filed in: Networking
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