Archive for September, 2007

AP acting as a repeater (WDS protocol) – Apple AirPort as a repeater of Linksys WRT54G

Thursday, September 27th, 2007

In a given place, an AirPort has been connected to the Internet. A Linksys router was added, however, it does not support acting as repeater, however, hidden, there is the ability to act as a WDS master.

The secret is based on the following steps, using the default firmware:

1. Setup Linksys for WEP, setup a key, setup an SSID and a channel.

2. Setup AirPort for WEP, using the same strength, using the same key, same SSID and same channel.

3. Setup AirPort for WDS, acting as “remote base station”. Add the MAC address of the Linksys (I got it using ‘iwlist’ command under Linux, when already connected to it. This is NOT the MAC marked on a sticker at its bottom!)

This should work. Try connecting a client machine to the AirPort Ethernet adapter and renew your DHCP lease to verify it’s working.

Reference taken from this blog. It helped me a lot.


Creativity can look weird

Monday, September 10th, 2007

Air Conditioning is considered a complicated matter. Not that it is so mathematically, but measurements, except for the general notion of “hot”, “hotter”, “cold” and “colder” are rather complicated, and require tools which are not common with the maintainers of server rooms. We trust flow diagrams, and air flow schema, however, the outcome should be a colder server room, and with some luck, with some less expenses on electricity.

I have recently seen such a creative solution in a company I have visited. The A/C solution suggested by the external experts the company has hired were overpriced and complicated, while the company needed a temporary solution for several months, especially the (hot Israeli) summer time.

I laughed my stomach out when I have seen the creative solution used in that particular server room. I felt as if I was taken back to the sci-fi B-movies of the 70s, however, the solution works, and is rather effective…

The building. Looks like the beginning of an invasion
The Aliens are coming!

Bottom line – it works. That is almost all that matters.