[dns-operations] question on dns setup, name-servers on adjacent IPs

[wbrown at e1b.org]

From: Veaceslav Revutchi <slavarevutchi at gmail.com>

> This is a vendor we make api calls to and once in a while the calls
> fail with a dns resolution error. The destination server that fails to
> resolve has an A record in the domain above. By the time the problem
> gets reported and looked at the name is resolving ok and there is not
> much in our bind resolver logs. No other dns related alerts around
> that time so I'm suspecting bind did not get a response from those two
> IPs. I'm setting up a couple of probes on the net to periodically
> query those NS, hopefully I will have more data next time it happens.
> Is there a best practice document on the number of NS and their
> distribution that I can forward to the vendor?

What is the timeout value in the application?  If one of the servers is 
down or loses a UDP packet, and the application needs to retry the second 
server, is it waiting long enough?




Confidentiality Notice: 
This electronic message and any attachments may contain confidential or 
privileged information, and is intended only for the individual or entity 
identified above as the addressee. If you are not the addressee (or the 
employee or agent responsible to deliver it to the addressee), or if this 
message has been addressed to you in error, you are hereby notified that 
you may not copy, forward, disclose or use any part of this message or any 
attachments. Please notify the sender immediately by return e-mail or 
telephone and delete this message from your system.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.dns-oarc.net/pipermail/dns-operations/attachments/20160825/011368d4/attachment.html>