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.
At least back in 2009 the block was only dns based. Use opendns or some other non-vietnamese dns provider to circumvent the blockage.
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.
china block facebook,twitter,youtube and so on.
yes, China’s great firewall blocks are well known and documented. As are the blocks in Burma.
Nope, they don’t. I had trouble connecting but then it worked. So I would attribute it to “too many users on a tiny pipe”
if that is the case, then the dns lookup should atleast return the ip not what was shown.
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