undefined | Better HN

0 pointsjedberg6y ago0 comments

Yeah I meant anycast (fixed above). And it's true, the other options would work too, but there would be added latency.

0 comments

With DNS failover there is only added latency during the time interval between when a server goes down, causing the DNS to get updated, and when the dead IP times out everywhere, which can easily be a few minutes. If the server can anticipate that it is going to go down it can remove itself, and then only people using shitty ISPs that don't respect the TTL will ever see extra latency.

jedbergOP6y ago

> and then only people using shitty ISPs that don't respect the TTL will ever see extra latency.

In my experience running large websites, that's about 10% of the internet, if not more.

When I made a DNS change, only about 70% of the traffic dropped off in the TTL. The rest took anywhere between a few hours and a few weeks (and some never dropped off, we had to just let them fail after a while).

kragen6y ago

Thanks, I didn't realize it was that large. :'(

Do you think the advent of DoH will improve that situation?

1 more reply

j / k navigate · click thread line to collapse

0 comments

kragen6y ago

jedbergOP6y ago

> and then only people using shitty ISPs that don't respect the TTL will ever see extra latency.

In my experience running large websites, that's about 10% of the internet, if not more.

kragen6y ago

Thanks, I didn't realize it was that large. :'(

Do you think the advent of DoH will improve that situation?

1 more reply

j / k navigate · click thread line to collapse