bind-users Digest, Vol 2230, Issue 1

[Mark Andrews]

In message <BLU184-W20FA2F59E295AE05BD94B81390 at phx.gbl>, Harshith Mulky writes:
>
> No Mark, This is not a question I am asked to answer for some course
>
> We have an implementation where, once the DNS Servers are down, The
> Client (Our device) Blacklists the IP address of DNS Servers for some
> period of Time
> It can only whitelist the server when it receives periodic Responses to a
> NAPTR Request.
>
> What I did find was even though Our Client was able to send periodic
> NAPTR requests, we are unable to check what kind of NAPTR requests are
> sent out
>
> Hence my question,
> What Kind of messages are required by the client to be sent towards
> server to determine if the DNS IP is reachable or not?

Ask your application vendor.  They dreamt up this scheme.  No one
here can help you beyond they will be DNS messages.

> Thanks
> Harshith
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org