[dns-operations] What's the most EDNS option codes you seen?

[Brian Hartvigsen (bhartvig)]

At OpenDNS/Cisco Umbrella we haven’t looked into this directly, but we have code deployed on the end point that stuffs multiple ENDS options into a single request.  There are networks where that fails.  Our testing has shown that some devices still kill DNS packets with more then 1 option code in the OPT record.

Other then where we have code to inject multiple options, we normally only see 0 or 1 in requests.  Upstream, we generally only send 1 (EDNS Client Subnet) at this time.

— Brian

> On Mar 7, 2017, at 11:42 AM, Barry Raveendran Greene <bgreene at senki.org> wrote:
> 
> 
> Has anyone every looked at the number of ENDS option coded uses at one time?
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