[CentOS] Re: OT: anything in CentOS 5.2 that uses opendns.com when browsing web?

Scott Silva ssilva at sgvwater.com
Mon Jul 14 17:19:55 UTC 2008


on 7-13-2008 10:06 AM Lanny Marcus spake the following:
> On 7/11/08, Scott Silva <ssilva at sgvwater.com> wrote:
> <snip>
>> I just played with one of my test vmware ipcop images and set it to dhcp on
>> our internal network (which should simulate your natted connection through
>> your adsl modem) for the red interface and I was able to dig +trace
>> google.com
>> with proper answers. So it is possible to get it working unless your ISP
>> blocks DNS queries to anywhere else but their own servers.
> 
> Scott: There are probably one or two configuration settings that I do
> not have correct at this time. That is why I am testing this on our
> Backup IPCop box.
> 
> You got this to work, so it will work for me, if & when I get the
> configuration settings correct. Question: Do I need to put something
> in the hosts file? At the moment, I cannot use that IPCop box to surf,
> because there is no name resolution. TIA! Lanny
Just played with the vmware box again. It won't resolve to itself, so forget 
putting the localhost address in the dns servers box. The other box I played 
with had a secondary address as a fallback and that is why it was working.

I think for the dig +trace to work for you you need a box that will do full 
recursion as your upstream DNS server. I had mine pointed to our caching 
resolver and I saw the queries log there.

I would forget about setting nameservers in your adsl modem as I doubt it has 
a very large cache so it will expire entries quickly. If you point your 
ipcop's dns entries to opendns or another free resolver you should be good to go.

-- 
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You hope everybody uses it, and
you notice quickly if they don't!!!!

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