DNS包
分析
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2009-05-07 08:31
DNS包分析
Protocol: UDP (0x11)
Header checksum: 0xb63c [correct]
[Good: True]
[Bad : False]
Source: 172.16.79.47 (172.16.79.47)
Destination: 172.16.0.100 (172.16.0.100)
User Datagram Protocol, Src Port: simple-tx-rx (2257), Dst Port: domain (53)
Source port: simple-tx-rx (2257)
Destination port: domain (53)
Length: 51
Checksum: 0x31bc [correct]
[Good Checksum: True]
[Bad Checksum: False]
Domain Name System (response)（域名系统）
[Request In: 712]
[Time: 0.006354000 seconds]
Transaction ID: 0x3330（交互ID）
Flags: 0x8180 (Standard query response, No error)（
标准
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查询响应，没出错）
1... .... .... .... = Response: Message is a response
.000 0... .... .... = Opcode: Standard query (0)（标准查询 代码0）
.... .0.. .... .... = Authoritative: Server is not an authority for domain（服务器末经授权）
.... ..0. .... .... = Truncated: Message is not truncated（信息末被截断
）
.... ...1 .... .... = Recursion desired: Do query recursively（递归思想：递归查询）
.... .... 1... .... = Recursion available: Server can do recursive queries（递归是否可用：是）
.... .... .0.. .... = Z: reserved (0)（保留位）
.... .... ..0. .... = Answer authenticated: Answer/authority portion was not authenticated by the server（回答验证：末被服务器验证）
.... .... .... 0000 = Reply code: No error (0)（回复代码：0 没出错）
Questions: 1（问
题
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数）
Answer RRs: 4（回答数）
Authority RRs: 0
Additional RRs: 0
Queries
csi.gstatic.com: type A, class IN
Name: csi.gstatic.com
Type: A (Host address)
Class: IN (0x0001)
Answers
csi.gstatic.com: type CNAME, class IN, cname csi.l.google.com
Name: csi.gstatic.com
Type: CNAME (Canonical name for an alias)
Class: IN (0x0001)
Time to live: 52 minutes, 53 seconds
Data length: 15
Primary name: csi.l.google.com
csi.l.google.com: type A, class IN, addr 64.233.189.102
Name: csi.l.google.com
Type: A (Host address)
Class: IN (0x0001)
Time to live: 3 minutes, 50 seconds
Data length: 4
Addr: 64.233.189.102
csi.l.google.com: type A, class IN, addr 64.233.189.100
Name: csi.l.google.com
Type: A (Host address)
Class: IN (0x0001)
Time to live: 3 minutes, 50 seconds
Data length: 4
Addr: 64.233.189.100
csi.l.google.com: type A, class IN, addr 64.233.189.101
Name: csi.l.google.com
Type: A (Host address)
Class: IN (0x0001)
Time to live: 3 minutes, 50 seconds
Data length: 4
Addr: 64.233.189.101
Domain Name System (query)（域名系统）
[Response In: 10]
Transaction ID: 0x0001（交互ID）
Flags: 0x0100 (Standard query)（标志）
0... .... .... .... = Response: Message is a query
.000 0... .... .... = Opcode: Standard query (0)（查询或响应类型：标准）
.... ..0. .... .... = Truncated: Message is not truncated
.... ...1 .... .... = Recursion desired: Do query recursively
.... .... .0.. .... = Z: reserved (0)
.... .... ...0 .... = Non-authenticated data OK: Non-authenticated data is unacceptable（非授权数据访问：不允许）
Questions: 1（问题记录数 ）
Answer RRs: 0（回答记录数）
Authority RRs: 0
Additional RRs: 0
Queries（查询）
100.0.16.172.in-addr.arpa: type PTR, class IN
Name: 100.0.16.172.in-addr.arpa
Type: PTR (Domain name pointer)（域名指针）
Class: IN (0x0001)
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