Re: Silently drop queries for AAAA records

2010-12-07 Thread Karl Auer
On Tue, 2010-12-07 at 16:31 -0600, David A. Evans wrote: I would like to silently drop the record lookups instead of responding back with NXDOMAIN. Thusly generating a performance hit as the application waits 2 seconds for the reply. Responding with NXDOMAIN will have a definite

Re: Troubleshooting slow DNS lookup

2010-12-07 Thread Rianto Wahyudi
Our network team are quite reluctant to make any changes on the FWSM in regards to DNS inspection. So it seems that we are stuck with maximum UDP packet of 512 byte. Unfortunately, I do not have much evidence (ie user complains) to escalate this issue much further except from few number of users

Re: Troubleshooting slow DNS lookup

2010-12-07 Thread Mark Andrews
In message aanlkti=t5tj29_gmngbtpug8cfyrqpgadr=-yvfwj...@mail.gmail.com, Rian to Wahyudi writes: Our network team are quite reluctant to make any changes on the FWSM in regards to DNS inspection. So it seems that we are stuck with maximum UDP packet of 512 byte. Unfortunately, I do not have

Re: Troubleshooting slow DNS lookup

2010-12-07 Thread Rianto Wahyudi
Hi Mark, Thanks for your quick response ! Standards Track. RFC 2671 Extension Mechanisms for DNS (EDNS0) RFC 3226 DNSSEC and IPv6 A6 aware server/resolver message size requirements Unfortunately RFC is not considered as good enough ... unless if we can find an actual proof that can be

Re: Silently drop queries for AAAA records

2010-12-07 Thread Niobos
On 2010-12-07 23:31, David A. Evans wrote: I'm in the mood to prove a point. I have a very poorly written application that is generating a few hundred queries per second of completely bogus records before attempting a lookup of the correct A records. This is because the