Dns ngambek?

Gak tahu server dns mana yang OK?

Ya di coba saja pake nslookup :-)

Dari gambar di atas terlihat bahwa Dns server nya ada 2 :

1. 202.146.178.4
2. 208.67.222.222

Kadang-kadang isian ini terisi hanya 1 saja, 2 atau bisa lebih dari 1.

Cara untuk testing apakah server dns ini bekerja baik bisa dengan menghapus ‘preferred’ dns server dan mengganti posisinya atau bisa juga menggunakan nslookup.

Caranya :

1. Klik start -> run

isikan cmd dan tekan OK.

2. Masuk ke DOS prompt

Tinggal di tes :

C:\Documents and Settings\Administrator>nslookup
Default Server:  dnscache1.elnus.net.id
Address:  202.146.178.4

> www.yahoo.com
Server:  dnscache1.elnus.net.id
Address:  202.146.178.4

Non-authoritative answer:
Name:    www.yahoo-ht3.akadns.net
Address:  209.131.36.158
Aliases:  www.yahoo.com

> server 208.67.222.222
Default Server:  resolver1.opendns.com
Address:  208.67.222.222

> www.detik.com
Server:  resolver1.opendns.com
Address:  208.67.222.222

Non-authoritative answer:
Name:    detik.com
Addresses:  202.158.66.94, 203.190.241.41, 203.190.241.43, 202.158.66.190
202.158.66.86, 203.190.241.166, 202.158.66.20
Aliases:  www.detik.com
> help
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

> server 208.67.222.222
Default Server:  resolver1.opendns.com
Address:  208.67.222.222

> lserver 202.146.178.4
Default Server:  dnscache1.elnus.net.id
Address:  202.146.178.4

>

Yup, untuk tes server mana yang bekerja sekarang bisa di pakai perintah :

server ip dns server

untuk berganti ke dns server sebelumnya di gunakan perintah :

lserver ip dns server

seperti contoh di atas :-)