Hello, On Mon, Jul 25, 2011 at 6:03 PM, Feng He <short...@gmail.com> wrote: > There is a "rr" flag in the response which indicates the answer is not > from a cache.
Could you please elaborate. Is the flag passed to the client ?? Attached are two calls to bind, to resolve www.google.com I have use the command dig www.google.com @BIND_LISTEN_IP all > /tmp/foo The first attachment named nonCache, should be should be the request/response of an query as soon as the bind server starts, hence things like reading root hints file come into picture (and so the large delay). The second attachment one is named cache, and should be the request/response from the bind's cache. The next section is inline pasting of the diff of the two attachments. <snip> 5c5 < ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 38534 --- > ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 24280 12,17c12,17 < www.google.com. 604800 IN CNAME www.l.google.com. < www.l.google.com. 300 IN A 74.125.236.51 < www.l.google.com. 300 IN A 74.125.236.52 < www.l.google.com. 300 IN A 74.125.236.48 < www.l.google.com. 300 IN A 74.125.236.49 < www.l.google.com. 300 IN A 74.125.236.50 --- > www.google.com. 604779 IN CNAME www.l.google.com. > www.l.google.com. 279 IN A 74.125.236.50 > www.l.google.com. 279 IN A 74.125.236.51 > www.l.google.com. 279 IN A 74.125.236.52 > www.l.google.com. 279 IN A 74.125.236.48 > www.l.google.com. 279 IN A 74.125.236.49 20,23c20,23 < google.com. 172800 IN NS ns4.google.com. < google.com. 172800 IN NS ns3.google.com. < google.com. 172800 IN NS ns2.google.com. < google.com. 172800 IN NS ns1.google.com. --- > google.com. 172779 IN NS ns3.google.com. > google.com. 172779 IN NS ns1.google.com. > google.com. 172779 IN NS ns4.google.com. > google.com. 172779 IN NS ns2.google.com. 25c25 < ;; Query time: 1820 msec --- > ;; Query time: 84 msec 27c27 < ;; WHEN: Mon Jul 25 21:18:45 2011 --- > ;; WHEN: Mon Jul 25 21:19:05 2011 31c31 < ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 52479 --- > ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 64054 40c40 < ;; Query time: 160 msec --- > ;; Query time: 120 msec 42c42 < ;; WHEN: Mon Jul 25 21:18:51 2011 --- > ;; WHEN: Mon Jul 25 21:19:05 2011 </snip> If you mean one of /something similar, #define NS_QUERYATTR_RECURSIONOK 0x0001 #define NS_QUERYATTR_CACHEOK 0x0002 #define NS_QUERYATTR_PARTIALANSWER 0x0004 #define NS_QUERYATTR_NAMEBUFUSED 0x0008 #define NS_QUERYATTR_RECURSING 0x0010 #define NS_QUERYATTR_CACHEGLUEOK 0x0020 #define NS_QUERYATTR_QUERYOKVALID 0x0040 #define NS_QUERYATTR_QUERYOK 0x0080 #define NS_QUERYATTR_WANTRECURSION 0x0100 #define NS_QUERYATTR_SECURE 0x0200 #define NS_QUERYATTR_NOAUTHORITY 0x0400 #define NS_QUERYATTR_NOADDITIONAL 0x0800 could you please tell me which it is Regards, Harish
nonCache
Description: Binary data
Cache
Description: Binary data
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