uaenorth.azure.glb.confluent.cloud. @75.2.51.54 (glbns1.confluent.cloud.): dns=ok zflag=ok edns=ok edns1=ok edns@512=extra,notc ednsopt=ok edns1opt=ok do=ok ednsflags=ok docookie=ok edns512tcp=extra optlist=expire-bad
Warning: test failures may indicate that some DNS clients cannot resolve the zone or will get a unintended answer or resolution will be slower than necessary.
Warning: failure to address issues identified here may make future DNS extensions that you want to use ineffective. In particular echoing back unknown EDNS options and unknown EDNS flags will break future signaling between DNS client and DNS server. We already have examples of this where you cannot depend on the AD flag bit meaning anything in replies because too many DNS servers just echo it back. Similarly the EDNS Client Subnet (ECS) option cannot just be sent to everyone in part because of servers just echoing it back.
dig +nocookie +norec +noad +dnssec +bufsize=512 +ignore dnskey zone @server
expect: NOERROR
expect: OPT record with version set to 0
expect: UDP DNS message size to be less than or equal to 512 bytes
See RFC6891, 7. Transport Considerations
dig +vc +nocookie +norec +noad +edns +dnssec +bufsize=512 dnskey zone @server
expect: NOERROR
expect: OPT record with version set to 0
See RFC5966 and
See RFC6891
dig +edns +noad +norec +nsid +subnet=0.0.0.0/0 +expire +cookie -q zone @server
expect: NOERROR
expect: OPT record with version set to 0
See RFC6891
To retrieve this report in the future: https://ednscomp.isc.org/ednscomp/36090ff4e7
The source code for the tester can be downloaded from ISC Open Source Projects / DNS-Compliance-Testing.
For more information about EDNS please see the main site.
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