Is Vietnam blocking Facebook?


I am sitting at a lounge in Ho Chi Minh City’s international airport and connected to the wifi. Interestingly, I cannot reach facebook.com.  Here’s the dig and traceroute info:

$ dig www.facebook.com

; <<>> DiG 9.7.3-RedHat-9.7.3-1.fc14 <<>> www.facebook.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 15351
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;www.facebook.com.		IN	A

;; AUTHORITY SECTION:
www.facebook.com.	86400	IN	SOA	vdc-hn01.vnn.vn. postmaster.vnn.vn. 2005010501 10800 3600 604800 86400

;; Query time: 17 msec
;; SERVER: 192.168.1.1#53(192.168.1.1)
;; WHEN: Thu May 12 19:11:39 2011
;; MSG SIZE  rcvd: 96

$ dig facebook.com

; <<>> DiG 9.7.3-RedHat-9.7.3-1.fc14 <<>> facebook.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 22473
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;facebook.com.			IN	A

;; AUTHORITY SECTION:
facebook.com.		86400	IN	SOA	vdc-hn01.vnn.vn. postmaster.vnn.vn. 2005010501 10800 3600 604800 86400

;; Query time: 15 msec
;; SERVER: 192.168.1.1#53(192.168.1.1)
;; WHEN: Thu May 12 19:12:16 2011
;; MSG SIZE  rcvd: 92
# traceroute facebook.com
facebook.com: No address associated with hostname
Cannot handle "host" cmdline arg `facebook.com' on position 1 (argc 1)

# traceroute www.facebook.com
www.facebook.com: No address associated with hostname
Cannot handle "host" cmdline arg `www.facebook.com' on position 1 (argc 1)
# dig @8.8.4.4 www.facebook.com

; <<>> DiG 9.7.3-RedHat-9.7.3-1.fc14 <<>> @8.8.4.4 www.facebook.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 22333
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.facebook.com.		IN	A

;; ANSWER SECTION:
www.facebook.com.	1	IN	A	69.63.189.26

;; Query time: 128 msec
;; SERVER: 8.8.4.4#53(8.8.4.4)
;; WHEN: Thu May 12 19:18:37 2011
;; MSG SIZE  rcvd: 50

Once I turned on my sshtunnel, I can get to facebook not otherwise. Interesting.

8 thoughts on “Is Vietnam blocking Facebook?

  1. At least back in 2009 the block was only dns based. Use opendns or some other non-vietnamese dns provider to circumvent the blockage.

    1. yes. hence if you look at the dig output, dig @8.8.4.4 was able to resolve the IP. However, even with placing the IP in the URL, the page never returned. I did some telnet ip# 80 to facebook and same issues. further probes using nmap showed the same blocks.

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