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

Brian Hartvigsen (bhartvig) bhartvig at cisco.com
Tue Mar 7 20:18:19 UTC 2017

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?
> _______________________________________________
> dns-operations mailing list
> dns-operations at lists.dns-oarc.net
> https://lists.dns-oarc.net/mailman/listinfo/dns-operations
> dns-operations mailing list
> https://lists.dns-oarc.net/mailman/listinfo/dns-operations

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 801 bytes
Desc: Message signed with OpenPGP
URL: <https://lists.dns-oarc.net/pipermail/dns-operations/attachments/20170307/b883ffda/attachment.sig>

More information about the dns-operations mailing list