IPv6 tunnel broker

Some years ago, I could connect to the IPv6 world over my IPv4 address by way of a free tunnel broker service. However, the service closed down in four years ago.

I have now used the tunnel broker of broker.aarnet.net.au in conjunction with gateway6 client which is basically a tunnel setup protocol (TSP) client. My new IPv6 address is :

2001:0388:f000:0000:0000:0000:0000:03ab

which could be shortened to :

2001:0388:f000::3ab

By the way, if we browse website by IPv6 addresses like :

2001:200:0:8000::42

It is necessary to use bracket to embrace the IP address:

http://[2001:200:0:8000::42]

how to find if a domain name is cached in a resolver

I have a task to test if a domain name is cached in a resolver. Of course, nslookup can not help and I have to turn to the more powerful dig.

#dig @1.2.3.4 www.cnn.com +norecurse

If the domain www.cnn.com has already been cached, the results will show the corresponding A records. However, if it is not, the results give the NS records of the 13 rootname servers.

職業病

某天在一份文件中看見 WED，一時間想不起是那一個政府部門的簡寫。思前想後，民航處是 CAD、環保處是 EPD、消防處是 FSD 、社署是 SWD、渠務處是 DSD等，何來有個部門叫 WED。在百思不得其解之際，終於給我想通了， WED 原來 WEDNESDAY 的簡寫，亦即是星期三。看來以後不要把 ??D 聯想到是政府部門。

國金二期 = 黑夜之神

黃昏乘渡輪回家，船上一位媽媽指着國金二期，問身邊的兒子這座大厦的名稱，這小朋友說是「黑夜之神」，鄰座的成年人都笑在嘴裡。你們這一代的小孩，應多留意身邊的事物，不要再沉迷於蝙蝠俠系列的電影裡。

6-antenna access point

This is the first time I have ever seen a 6-antenna access point. The model is Motorola AP-7131 which can support 802.11a,b,g and n. When running on 802.11n 3x3 MIMO, the maximum speed can be up to 600 Mbps.




But don't be excited. This is an enterprise-grade access point. It is not a consumer product. Average home users might not have the chance to buy or use it.