All,
When I run the command 'dig www.google.com.hk +bufsize=768',I got this message,
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 22832
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1


;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; MBZ: 0005 , udp: 512
;; QUESTION SECTION:
;www.google.com.hk.             IN      A

The value of field MBZ is 0x0005!!
According to the RFC,there is no value assigned to the field now.I think it 
should be zero now.
What has caused this phenomenon?
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