Flush DNS CMD?

+3 votes
Everytime I send a query about not being able to browse I get told to flush DNS. How do I do that and how is it of use to me?
asked Feb 5, 2015 in ADSL by anonymous

2 Answers

0 votes
Whenever you type a URL on the address bar it fetches the corresponding IP address to communicate with web server. When you repeatedly use a same URL its just a waste of network resource to fetch corresponding IP adress everytime because IP's dont change too often. So your computer stores the combinations of domain name and its IP in local cache to avoid fetching from Domain name Server(DNS) everytime you use same domain name(URL). It also holds another crucial info called "Timeout" which says about the valid time for the IP and domain name combination, when this time times out your computer re-fetches the combination from DNS and stores in local cache again. Dns flushing is the mechanism where the user can manually make all the entries in the cache invalid, so your computer re-fetches new combinations by now on whenever it needs and stores in local cache.

Afrihost Team
answered Feb 5, 2015 by AfriDude (43,950 points)
0 votes
You can flush with the following commands:

Windows -

Start >> Run >> type cmd

ipconfig /flushdns

Linux - As root run (su or sudo)

cd /etc/rc.d/init.d

./nscd restart

Mac - Tiger

lookupd -flushcache

Mac - Leopard

dscacheutil -flushcache
answered Feb 5, 2015 by Jacques_Stry (2,170 points)