Flush DNS cache

Guest2

Guest2

Guest2

Soldato
Joined
6 May 2009
Posts
20,361
I have a laptop that I am trying to use on an open DNS. I have tried ipconfig /flushdns and then restarting and it still doesnt work. What is the other command and/or other things I can do to clear the laptop?


Its not working with the following


Service provider: Google
• 8.8.8.8
• 8.8.4.4

Service provider:dnsadvantage
Dnsadvantage free dns server list:
• 156.154.70.1
• 156.154.71.1

Service provider:OpenDNS
OpenDNS free dns server list:
• 208.67.222.222
• 208.67.220.220
 
Is this in a work environment?

The reason I ask, is in a work environment things like this can be blocked in the network setup
 
Last edited:
bledd. said:
Is this in a work environment?

The reason I ask, is in a work environment things like this can be blocked in the network setup
Click to expand...

Yes. But its on a seperate, unsecure connection that has never touched our network. I need to download something that 600mb and it would be better to do it on an 8mb connection than the 2mb (currenty being upgraded to 5mb) connection that 100 people share
 
why don't you just describe the exact problem you're having? i very much doubt ipconfig has anything to do with what you're trying to achieve. :/
 
BlueMhz said:
As already mentioned, explanation of your problem and what you are trying to do, would be helpful.
Click to expand...

Its a standard Dell laptop. I am trying to get a net connection to it so i can download VMWare Server, its around 600mb. I connected a laptop to it earlier in the week and used these DNS servers

• 208.67.222.222
• 208.67.220.220

I could then go to google and browse sites as usual. With this one it doesnt work. It has got some more programs on it than usual and I see a VPN connection has been setup.

Thanks
 
bledd. said:
Ask your IT administrator
Click to expand...

I am IT admin (well not admin, more support) Boss has forgot the command that he used to clear it before. I tried dnscmd /clearcache but it came up as an unrecognized command

edit - also no one else in the company has access to the unsecured connection, or even know about it for that matter
 
Thats not the point. We used the same laptop a while ago on open DNS servers and it was fine. I enter 209.85.22.99 and google appears.

What would be stopping the DNS servers working correctly. Its not really practical to go home every time we need to download something large in size!
 
Daegan said:
A firewall? It's quite sensible to restrict DNS requests to a couple of specific servers. Speak to whoever manages the connection.
Click to expand...

I don't allow anything other than our internal DNS servers to request anything from the WAN on port 53. So yes, it's quite a sensible suggestion.
 
marc2003 said:
unbelievable... :o
Click to expand...

Come on then mr know it all, some clues on why its not working? I'm not a networking type guy so i know little about ipconfig type stuff. I'm more group policy, AD, Citrix, Blackberry management...

paradigm -

Broadcom netXtreme 57XX gigabit controller
dhcp - yes
auto configured - yes
ip address - 192.168.10.20
subnet - 255.255.255.0
gateway - 192.168.10.1
dhcp - 192.168.10.1
DNS server primary 156.138.54.100
DNS server secondary 208.67.222.222

edit - I have just checked and it still has the firewall setting from group policy when it was connected to the domain. I have turned them off on the local policy and restarted but they are still showing as on and greyed out. Am I just being a retard like usual on friday??
 
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So what is this 'other' connection? How come only you know about it?

I still don't see what you're trying to do?


You know what DNS is right? it basically resolves IP addresses to host names.

Ie, it says "where is the IP for overclockers.co.uk"
reply "it's 215.xx.x.xxx go there to find it"
 
Last edited:
bledd. said:
So what is this 'other' connection? How come only you know about it?

I still don't see what you're trying to do?


You know what DNS is right? it basically resolves IP addresses to host names.

Ie, it says "where is the IP for overclockers.co.uk"
reply "it's 215.xx.x.xxx go there to find it"
Click to expand...

The other connection is another 8mb connection we have in our company, its basically a standard connection we use to download anything large or test VPN etc. It doesnt and will never touch our main connection

Yes, as I said above I entered 209.85.22.99, the ip address for google and it worked. Searching for anything didnt work as it went to google/search
 
Have a play around with NSLookup, it will tell you if it can't reach your current DNS. Doesn't your service provider provide external DNS? why are you specifically trying to use open services?
 
Sounds like a firewall issue as mentioned above... someone (with good sense) has blocked any connections to unauthorised DNS servers. :)
 
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