Re:Facebook-owned sites were down
by john37386 on Monday October 04, 2021 @12:42PM
(#28749192)
Even the Name servers are not returning any values. That's bad.
dig @8.8.8.8 +short facebook.com NS
These are usually anycasted, meaning that 1 ip return in NS are in fact several servers spread in several regions. They are distributed to closer match through agreements with ISP with the BGP protocol. Very interesting, because it seems that it took 1 DNS entry misconfiguration to withdraw M$ worth of devices from the internet.
dig @8.8.8.8 +short facebook.com NS
These are usually anycasted, meaning that 1 ip return in NS are in fact several servers spread in several regions. They are distributed to closer match through agreements with ISP with the BGP protocol. Very interesting, because it seems that it took 1 DNS entry misconfiguration to withdraw M$ worth of devices from the internet.