No. Time Source Destination Protocol Info
2 0.000535 10.24.55.8 216.239.36.10 DNS Standard query A
Frame 2 (85 bytes on wire, 85 bytes captured)
Ethernet II, Src: Vmware_10:51:39 (00:0c:29:10:51:39), Dst: Cisco_5c:3b:80 (00:13:80:5c:3b:80)
Internet Protocol, Src: 10.24.55.8 (10.24.55.8), Dst: 216.239.36.10 (216.239.36.10)
User Datagram Protocol, Src Port: 20708 (20708), Dst Port: domain (53)
Domain Name System (query)
[Response In: 3]
Transaction ID: 0x140f
Flags: 0x0000 (Standard query)
0... .... .... .... = Response: Message is a query
.000 0... .... .... = Opcode: Standard query (0)
.... ..0. .... .... = Truncated: Message is not truncated
.... ...0 .... .... = Recursion desired: Don't do query recursively
.... .... .0.. .... = Z: reserved (0)
.... .... ...0 .... = Non-authenticated data OK: Non-authenticated data is unacceptable
Questions: 1
Answer RRs: 0
Authority RRs: 0
Additional RRs: 1
Queries
: type A, class IN
Name:
Type: A (Host address)
Class: IN (0x0001)
Additional records
: type OPT
Name:
Type: OPT (EDNS0 option) -----------------------------（2字节，与标准RR相同）
UDP payload size: 4096 ------------------------------（2字节，对应标准RR中的CLASS）
Higher bits in extended RCODE: 0x0 -------------------（1字节，对应标准RR中TTL的第一个字节）
EDNS0 version: 0 ------------------------------------（1字节，对应标准RR中TTL的第二个字节）
Z: 0x8000 -------------------------------------------（2字节，对应标准RR中TTL的后两个字节）
Bit 0 (DO bit): 1 (Accepts DNSSEC security RRs)
Bits 1-15: 0x0 (reserved)
Data length: 0 ---------------------------------------（2字节，与标准RR相同）
0000 00 13 80 5c 3b 80 00 0c 29 10 51 39 08 00 45 00 ...\;... ).Q9..E.
0010 00 47 93 54 00 00 40 11 a9 38 0a 18 37 08 d8 ef .G.T..@. .8..7...
0020 24 0a 50 e4 00 35 00 33 a5 0d 14 0f 00 00 00 01 $.P..5.3 ........
0030 00 00 00 00 00 01 03 77 77 77 06 67 6f 6f 67 6c .......w ww.googl
0040 65 03 63 6f 6d 00 00 01 00 01 00 00 29 10 00 00 e.com... ....)...
0050 00 80 00 00 00 .....
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