Day before yesterday i.e on 18th August 2016 Bangladesh’s TLD .bd went had an outage. It was originally reported by Jasim Alam on bdNOG mailing list.
His message shows that DNS resolution of BTCL (Bangladesh Telecommunications Company Ltd) was failing. Later Alok Das that it was the power problem resulting in outage.
Let’s look ask one of 13 root DNS server about NS records on who has the delegation for .bd.
So two of out of these three seem to be on BTCL network and that too on same /24.
Let’s ping to all these three using NLNOG Ring node of bdHUB: bdhub01.ring.nlnog.net
So clearly all three servers are in Bangladesh/local as per super low latency from bdHUB node. From traces from outside India it’s quite unlikely of any other anycast node outside Bangladesh. This is a serious design issue. For a country’s TLD one should have much more resiliency.
My good friend Fakrul from APNIC mentioned on mailing list about PCH becoming secondary for .bd. Same is visible now in the authority NS records of the domain.
dig @dns.bd. bd. ns +short
jamuna.btcl.net.bd.
dns.bd.
bd-ns.anycast.pch.net.
surma.btcl.net.bd.
So once the same is added on root DNS servers, it will bring up bit more resiliency with PCH’s platform with large number of anycast nodes.
So what was impact of this outage?
Well, probably a lot. .bd TLD outage would have brought down a lot of websites running on .bd domain. Any fresh DNS lookup would have failed, any websites with lower TTL would have went down. As per bdIX traffic graph some disturbance is visible across that day.