Hi All,
RFC 2671 mentions in Section 5.3 Responders who do not understand these protocol extensions are expected to send a response with RCODE NOTIMPL, FORMERR, or SERVFAIL. However the above mentioned error codes are shared [SERVFAIL, NOTIMPL] are shared, so how do we ascertain that the error code returned is an indication that a particular server is non-EDNS, since the error might be returned due to some other reason also. So essentially my query is how do we decide that a particular server is EDNS or not? Can it be assumed that each time the above three error codes are returned , it signifies that the DNS server is not EDNS capable? Regards Ashwin
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