Just was looking around at EDNS support by Google. To find how it supports and how packet looks like I created a test NS records for dnstest.anuragbhatia.com pointing to one of test server (178.238.225.247). I wasn’t running any DNS server on the server. Just ran quick tcpdump. At server end:
sudo tcpdump 'port 53 and dst 178.238.225.247' -nn -vvv -w sample.pcap Then I forcefully triggered DNS queries via Google’s recursor using:**
Earlier this month Dyn started with it’s Indian PoP. I came across news from Dyn’s blog post. It’s very good to see first Amazon AWS and now Dyn in India. With a warm welcome to Dyn let’s look at their Indian deployment.
Dyn using AS33517 which seems to be having upstream from Tata-VSNL AS4755 and Airtel AS9498. Dyn seems to be announcing 103.11.203.0/24 to both networks in Mumbai to transit. There are routes in global IPv4 routing table which show Tata & Airtel as transit for Dyn.
Few days back I noticed F root server (which is with ISC) brought it’s anycasted node in NIXI Chennai back live. They have taken that down as per my interaction with them over mailing list. My last post about F root coming back live was with guess work on who’s providing upstream. Today I spent sometime in finding who’s providing transit to that node. It is very important to note that most of these key infrastructure related nodes rely on peering for most of traffic but a transit in form of full table or default stays so that one can push packets to a route if it is not in table learnt from peering.
And finally ACN i.e “Advanced Computer Networks” exam next. Hopefully less to cram in this one and syllabus is pretty interesting. Talking about networks - I am very happy to post this update. Finally F root server’s node in Chennai is back up! Though ISC did not updated me about this development but anyways I can always assume they were busy in hitting head with India bureaucratic bodies. :)
If you are following my blog, you might have seen my past blog post about “Broken connectivity of F root server” due to NIXI’s routing policies.
One of my friend told me on error coming for http://www.musicindiaonline.com/ which was showing error that website is blocked as per DoT orders. I just checked it now and for now domain is not resolving at all! Quick analysis to see how site is blocked. anurag@laptop:~$ dig musicindiaonline.com a ; «» DiG 9.8.1-P1 «» musicindiaonline.com a ;; global options: +cmd ;; Got answer: ;; -»HEADER«- opcode: QUERY, status: NOERROR, id: 23431 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;musicindiaonline.