I have just seen a post at . It is very interesting. They found . Check it out. It is the sign! To find out more, you might try Google Images with keyword .

One picture is better than thousand words. If you don’t understand how iptables work in my previous post about secure Linux gateway, it is because you don’t know how it works and what the chains are. To understand iptables’s flow at a glance, I found a brief explanation at IP Masquerading (NAT) using iptables.

Nowadays, you might have a network of computers linked as an intranet and you want to let them read/reply e-mail. So you have to connect them to Internet by something. The key component is a router aka gateway. You might just buy an ADSL router  with RJ45 port. Anyway, in case of you have too many machines, ADSL router maybe unable to handle all requests successfully due to design limitation. For example, ZyXEL Prestige 650-R can only handle 1024 concurrent connections. If the router has 1024 concurrent connections, next connection will be dropped silently.

To all command-line fanclub, I am very proud to announce the latest release of BTQueue 0.1.0 418. I recommend all you to upgrade as soon as possible to take all advantage of this bug fix version. Below is the list of fixed bugs.

1. Allow to force start a session with "resume" command
2. Handle failure gracefully
3. Support private tracker with malform announce url without failure

As always, all files are available at sf.net.

Are you using ? I am one of Google Talker. It is very stable and reliable comparing to MSN. Since 2 weeks ago, I have continuously convinced lots of my friends to join Google Talk network. All of them loves it. Yes, all of them. Anyway, some of them don’t like to install Google Talk client on his machine because they already run other IM, e.g., MSN, Yahoo, ICQ, and etc. Fortunately, they are glad to talk via Gmail. Otherwise, some of them are chatting via  since Google Talk is XMPP compliant IM. Today, Google  statistics according to third party clients how they are popular.

If you are using ZyXEL Prestige 650 Series, e.g. Prestige 650-R, like me, you must be aware of its limitation. According to its support note, this router does not limit the number of the users but the number of the sessions. In particular, the Prestige 650 supports concurrent 1024 sessions. A session is an end-to-end pair of two IP addresses. For example, whenever you view a web page, you are probably establishing 1 to 10 sessions depending on browser settings, internal frames, and images in that page. Instant messengers hold at least one connection. Assuming that a machine will always establish at least 10 connections, as a result, there are approximately 500 sessions for 50 machines. For more precisely, you can view the active sessions using telnet interface. Just follow below procedure.