Tuesday, January 28, 2003

blogspot.com blocked again
Probably on US EST 1/28 but no earlier than 1/27 for sure, is blocked at the national gateway level. Checking from Beijing, and is fine.

Recently, China is doing mush less DNS hijacking. Experience from Dynaweb is: if you demonstrate your capability to change IP within a few hours after it is blocked, they will give up.

Friday, January 17, 2003

More information came in this morning: blogspot.com change the IP from to
The old IP is still blocked at national gateway level, and the second IP is not.

So the observation of the previous post is still valid: blogspot.com is not blocked now (techncially the IP it is currently pointing to), and dweb.blogspot.com is still blocked in China due to dns hijacking.

Dynaweb also move its node IP publishing page to other place. (I know the Chinese internet police is watch this as well.) Let's see what is going to happen next with blogspot's new IP. (They will certainly try to block wherever DynaWeb goes, although sometimes in vain.) I will post updates here.

Thursday, January 16, 2003

Blogspot.com unblocked, dweb.blogspot.com still blocked

At US EST 1/15 9:43pm, I saw first report was posted that his blog on blogspot.com can be viewed from China again. Within on hour, many users confirmed this. Thank you Juliana Liu! Thank you Reuters. Juliana's article has a time stamp of 01.15.03, 12:59 AM ET. (21 hours before the report of accessibility to blog.) From DynaWeb's experience, China is capable of blocking an IP after it is identified with a few hours with all the administration overhead and technical overhead.

However, dweb.blogspot.com is still dns hijakced.

So China did the following:
1. unblock blogspot.com's IP after Juliana's article.
2. Leave dweb.blogspot.com dns hijacked.

Sunday, January 12, 2003

As first publically reported by Greg Walton, China blocked blogspot.com on Jan. 9, 2003. We believe that China blocked it because Chinese are retrieving DynaWeb IPs to gain access to forbidden sites. (DynaWeb is a proxy network that supports encrypted proxy and CGI proxy. )

Time line:
12/23/02: DynaWeb first publicized dweb.blogspot.com to its subscribers.
12/25/02: DynaWeb publicized dweb.blogspot.com into Chinese news media (outside China of course).
1/8/03: Between 5:30am-5:40am, dweb.blogspot.com experience dramatic traffic drop.
1/9/03 2am EST: DynaWeb received the first report that dweb.blogspot.com can't be accessed from China. It was then verified that the IP of blogspot.com was blocked. Therefore, all bloggers hosting their blog on this site will no longer be accessible from China as well.

Besides IP blocking, China also hijacked the domain name "dweb.blogspot.com". (see http://www.dit-inc.us/hj-09-02.html for more details of the DNS hijacking.) However, other subdomains are not hijacked. This can be verified from outside China. Here is a screen output you can reproduce:
C:\>nslookup dweb.blogspot.com ns4.bta.net.cn
Server: ns4.bta.net.cn

Non-authoritative answer:
Name: dweb.blogspot.com

C:\>nslookup bill.blogspot.com ns4.bta.net.cn
Server: ns4.bta.net.cn

Name: bill.blogspot.com

C:\>nslookup blogspot.com ns4.bta.net.cn
Server: ns4.bta.net.cn

Name: blogspot.com

Here you can see that dweb.blogspot.com is the one Communist party pick up to be the most subversive among all bloggers to be on the DNS hijacking list.

So when this blocking happen? Log of dweb.blogspot.com must be a good source of info to see this,
1. It is one of the most popular Chinese page.
2. Most readers are from IPs in China. One will visit this blog only if they are blocked in China. (Not now, while you are reading this. :) )

We process some statistic on 1/8 (sorry, they use California time, which is GMT -8, EST is GMT -5, I can convert all those time later on after I find new ways for Chinese to get Dynaweb IP.)

Those data are saying that it is blocked between 2:30am-2:40am on 1/8.

Here is the data on 1/8:
2:00am-2:10am 29
2:10am-2:20am 38
2:20am-2:30am 51
2:30am-2:40am 15
2:40am-2:50am 3
2:50am-3am 1
3am-4am 0
4am 1
5am 1
6am 1
7am 1
8am 7
9am 4
10am 0
11am 0
12pm 1
1pm 6

You may contact me at contact@dit-inc.us .

Monday, December 23, 2002

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Monday, December 16, 2002