Re: [DNSOP] New Version Notification for draft-perreault-dnsop-stats-mib-01.txt

[Simon Perreault <[e-mail]>]

Le 2012-07-23 06:47, Stephane Bortzmeyer a écrit :
> Main comment: I am not convinced by the whole idea of "Discontinuity
> Time". Isn't the whole idea of SNMP to have dumb agents, often without
> stable memory, and the manager is supposed to know that, to detect
> discontinuities and to deal with it? Why is DNS different from typical
> MIB-II counters, which can go back to zero when the router reboots?

The main use case is when the DNS daemon restarts and loses state. This 
creates a discontinuity in the DNS MIB counters but not in the global 
MIB-II counters. That's why we introduced a separate discontinuity 
indicator that the manager can monitor to identify discontinuities, just 
like it does with MIB-II.

Other MIBs use the same technique (e.g. the OSPFv2 MIB [RFC4750]).

> Second, the draft requires a mention of RFC 6168, which covers also
> statistics.

Clearly we can add a reference to that RFC.

But it looks like it doesn't go into much detail about what statistics 
are needed, just that some are. So, not much guidance for us. Or did I 
overlook something?

> Otherwise, the draft seems sensible, addresses a real problem for DNS
> operators who have subcontractors, and, IMHO, correctly answer the
> warnings of RFC 3197.

Thank you! That's very encouraging!

Simon
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