Q: DNS query format
Vitaly Karasik
Vitaly.Karasik at Kayote.com
Thu Jan 25 15:58:26 UTC 2007
Is this DNS query correct?:
Domain Name System (query)
Transaction ID: 0x938a
Flags: 0x0110 (Standard query)
0... .... .... .... = Response: Message is a query
.000 0... .... .... = Opcode: Standard query (0)
.... ..0. .... .... = Truncated: Message is not truncated
.... ...1 .... .... = Recursion desired: Do query recursively
.... .... .0.. .... = Z: reserved (0)
.... .... ...1 .... = Non-authenticated data OK:
Non-authenticated data
is acceptable
Questions: 1
Answer RRs: 0
Authority RRs: 0
Additional RRs: 1
Queries
1.2.3.e164.arpa: type NAPTR, class IN
According to RFC1035, 3 reserved bits should be 0s. But in my example
second bit is 1 and even interpreted by Etherreal as "Non-authenticated
data OK" flag.
So is this a legal query?
(the reason I'm asking is: this query is coming from forward-only zone
in bind9. We have custom ENUM server which doesn't accept this query. )
TIA,
Vitaly
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