DNS tools
顯示存放在本機的 DNS Resolver Cache
ipconfig /displaydns
清除存放在本機的 DNS Resolver Cache
ipconfig /flushdns
nslookup 手動查詢 DNS 上一些資料
| C:\>ipconfig /flushdns Windows IP Configuration Successfully flushed the DNS Resolver Cache. C:\>nslookup Default Server: vassun2.macau.ctm.net Address: 202.175.3.8 > ? Commands: (identifiers are shown in uppercase, [] means optional) NAME - print info about the host/domain NAME using default server NAME1 NAME2 - as above, but use NAME2 as server help or ? - print info on common commands set OPTION - set an option all - print options, current server and host [no]debug - print debugging information [no]d2 - print exhaustive debugging information [no]defname - append domain name to each query [no]recurse - ask for recursive answer to query [no]search - use domain search list [no]vc - always use a virtual circuit domain=NAME - set default domain name to NAME srchlist=N1[/N2/.../N6] - set domain to N1 and search list to N1,N2, etc. root=NAME - set root server to NAME retry=X - set number of retries to X timeout=X - set initial time-out interval to X seconds type=X - set query type (ex. A,ANY,CNAME,MX,NS,PTR,SOA,SRV) querytype=X - same as type class=X - set query class (ex. IN (Internet), ANY) [no]msxfr - use MS fast zone transfer ixfrver=X - current version to use in IXFR transfer request server NAME - set default server to NAME, using current default server lserver NAME - set default server to NAME, using initial server finger [USER] - finger the optional NAME at the current default host root - set current default server to the root ls [opt] DOMAIN [> FILE] - list addresses in DOMAIN (optional: output to FILE) -a - list canonical names and aliases -d - list all records -t TYPE - list records of the given type (e.g. A,CNAME,MX,NS,PTR etc.) view FILE - sort an 'ls' output file and view it with pg exit - exit the program > www.yahoo.com Server: vassun2.macau.ctm.net Address: 202.175.3.8 Non-authoritative answer: Name: any-fp.wa1.b.yahoo.com Addresses: 98.137.149.56, 72.30.2.43 Aliases: www.yahoo.com, fp.wg1.b.yahoo.com > set all Default Server: vassun2.macau.ctm.net Address: 202.175.3.8 Set options: nodebug defname search recurse nod2 novc noignoretc port=53 type=ANY class=IN timeout=2 retry=1 root=A.ROOT-SERVERS.NET. domain= MSxfr IXFRversion=1 srchlist= > > set type=any > www.yahoo.com Server: vassun2.macau.ctm.net Address: 202.175.3.8 Non-authoritative answer: www.yahoo.com canonical name = fp.wg1.b.yahoo.com yahoo.com nameserver = ns8.yahoo.com yahoo.com nameserver = ns2.yahoo.com yahoo.com nameserver = ns4.yahoo.com yahoo.com nameserver = ns5.yahoo.com yahoo.com nameserver = ns6.yahoo.com yahoo.com nameserver = ns1.yahoo.com yahoo.com nameserver = ns3.yahoo.com ns1.yahoo.com internet address = 68.180.131.16 ns2.yahoo.com internet address = 68.142.255.16 ns3.yahoo.com internet address = 121.101.152.99 ns4.yahoo.com internet address = 68.142.196.63 ns5.yahoo.com internet address = 119.160.247.124 ns6.yahoo.com internet address = 202.43.223.170 ns8.yahoo.com internet address = 202.165.104.22 > ls www.yahoo.com [vassun2.macau.ctm.net] *** Can't list domain www.yahoo.com: BAD ERROR VALUE > Is www.yahoo.com Server: any-fp.wa1.b.yahoo.com Addresses: 98.137.149.56, 72.30.2.43 Aliases: www.yahoo.com, fp.wg1.b.yahoo.com DNS request timed out. timeout was 2 seconds. *** Request to www.yahoo.com timed-out C:\>nslookup Default Server: vassun2.macau.ctm.net Address: 202.175.3.8 > server 202.175.3.3 Default Server: macau.ctm.net Address: 202.175.3.3 > |
Authoritative/Non-Authoritative
在查詢時有時會出現 Non-authoritative answer, 代表這個答案是由 local DNS 的 cache 中直接讀出來的, 而不是 local DNS 向真正負責這個 domain 的 name server 問來的.
一些常用option會有 例如 set all , server x.x.x.x , set type=any 和 Is
#Is 要求 name server 將其負責的 zone 內容顯示出來
#set all : Prints the current values of the configuration settings
#server x.x.x.x: 重特定name server 做query
#set type = any 可以顯示更多的資訊
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