Last saturday one of our Web server experienced a TCP SYN attck which make the system down for four hours. It seems there is not a good solution which could detect & defend DoS traffic at any time. So, to the class ANY queries, should we only filtering out class any queries on public cache servers ? To my understandings, the amplifying result could also be reached by query type any. Joe --- Alon Tirosh <j0keralpha@gmail.com> wrote:
Admitted, i did not notice the type/class difference. I responded as a knee jerk reaction, and that is my mistake.
For the second part, the any query type is useful (when targeted at either your NS and/or public NS servers) to quickly alert to issues such as the one being discussed with GoDaddy and Nectartech right now on this list.
Pick and/or set up an NS server that is TTL agnostic (flameArmor: this system is to be used for disparate up-to-date checks only, and I know by spec this is far from foolproof but its saved my ass a couple times in the past) and checks disparate roots and its useful for finding or alerting to major name system, registrar ,and provider issues quickly.
Im diverging off-topic, im sure. gnight.
On 1/17/06, william(at)elan.net <william@elan.net> wrote:
Did you notice that it was class "ANY" and not
I've never ever heard of it being used anywhere....
As for ANY query type, what do you think will happen when you query with "ANY" to a host in a domain that is not in your local dns server cache? And btw if it is in your dns cache, how
type "ANY" that Paul noted? predictable do you think such
results are going to be???
On Tue, 17 Jan 2006, Alon Tirosh wrote:
Not true,. the ANY query has mutliple uses for consolidating multiple diagnostic queries into a single display, and also for diversion monitoring systems on small domains or groups of same. Not all of us have the resources (or time) of large ISPs behind us.
On 15 Jan 2006 17:27:40 +0000, Paul Vixie <vixie@vix.com> wrote:
client xx.xx.xx.xx#6704: query: z.tn.co.za ANY
ANY +E
class "ANY" has no purpose in the real world,
not even for debugging. if
you see it in a query, you can assume malicious intent. if you hear it in a query, you can safely ignore that query, or at best, map it to class "IN". -- Paul Vixie
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