google

Backend of Google's Public DNS

Anurag Bhatia
And finally academic session over. Done with all vivas and related stuff. Next will be exams likely in June. Time for me to get ready for travel. :) Anyways an interesting topic for today’s post - Google Public DNS. Lot of us are familier with popular (and free) DNS resolvers 8.8.8.8 and 8.8.4.4. I have covered reason in previous posts on why it tends to fail with Content Delivery networks like Akamai which rely on anycasting at bottom DNS layer and simple unicasting on application servers.

Dumb script for Picasaweb backup on Linux server & Amazon S3

Anurag Bhatia
Just wrote a quick script to pull dump of Picasaweb albums backup on my server & further to Amazon S3. Overall I have good trust on Google for data but it’s always a poor idea to leave all eggs in single bucket. OK here’s the script (poorly written code. Literally spent 10mins on this, thus suggestions to improve my coding are more then welcome!) #!/bin/bash Destination=<PUT YOUR DESTINATION HERE!> google picasa list-albums | cut -d"," -f1 » $Destination/tmp/album_list.

Google's routing issues because of an Indonesian ISP

Anurag Bhatia
Yesterday it was reported across networking community that Google’s prefixes were having issue due to an Indonesian ISP Moratel AS23947. Quick analysis From data logged by routeviews it seems like it wasn’t exactly a prefix hijack. AS23947 did not originated prefixes but rather had a route leak leading to path leak of AS23947 > AS15169. Here’s a view of global routing table for Google’s prefix 216.239.32.0/24 at 15:57 GMT on 4th Nov:

Should Google pay to Airtel for data interconnection charges?

Anurag Bhatia
Yesterday I had a discussion with a friend from Airtel after long time. For some strange reason discussion topic was changed to old statements from Bharti Airtel’s executives that companies like Google, Facebook, Yahoo etc should pay to ISPs like Airtel for “data interconnection”. The argument goes more for Google then any other company. Statements from Airtel can be found here and here. The argument? Companies like Airtel who have built a “physical infrastructure” feel that companies like Google should pay to them since they are putting so much of traffic on their networks.

Skype Vs Gmail phone: Quick check on latency with IP-PSTN gateways

Anurag Bhatia
I usually find that Gmail phone performs lot better then Skype for calls to PSTN. Usually latency on Skype is high as compared to Gmail phone in India (in US it was almost no difference). I looked around today and here’s bit of test data I collected by calling couple of numbers from Skype & Gmail phone & monitored UDP traffic to collect information about destination servers which is very likely IP-PSTN gateway.