getting edns disabling message in logs

[Cathy Almond]

On 04/07/12 07:12, Ben wrote:
> Hi Tony,
> 
> Thanks for your kind response. Disabling EDNS due to firewall
> misconfiguration, raise any problem to DNS activity.? I mean my users
> face any name resolution problesms or ...?

https://kb.isc.org/article/AA-00708/55/Why-does-BIND-log-messages-about-disabling-EDNS-or-reducing-the-advertised-packet-size

(Just created, so apologies if there are any typos or other editorial
corrections needed - they will happen later)

> Is there any way that we can show that current disabling EDNS happens by
> firewall issue ?

That's a bit tricky, if what's broken is not in your network space.  On
the other hand, if you're getting this reported for every domain that is
queried, then it's probably *your* problem.