RE: [Nolug] ISP failover w/DNS

Hi Ron.

I'm not clear on what you mean by a DNS proxy server.

Some refer to a DNS forwarder as a proxy resolver.

If you are running servers which outsiders need access to then the router
will probably have to act as a DNS server, also. Else the outside world
will have trouble finding your servers in an efficient fashion. Listing
both sets of address in DNS works, but is not efficient when one feed is
down.

Yes, running public servers raises it to another level. :) The next step
is your own address space and BGP routing.

Regards,

John

    John Souvestre - New Orleans LA - (504) 454-0899

-----Original Message-----
From: owner-nolug@stoney.kellynet.org
[mailto:owner-nolug@stoney.kellynet.org] On Behalf Of Ron Johnson
Sent: Saturday, May 14, 2011 2:00 pm
To: nolug@nolug.org
Subject: Re: [Nolug] ISP failover w/DNS

Do these routers have DNS proxy servers?

On 05/14/2011 01:52 PM, John Souvestre wrote:
> Hi Chris.
>
> I’ve seen a few low-end units which don’t, but most do.
>
> Oh, and as you surmised, the local machines should use the router for
> their DNS lookups. Actually, this is true in general, even on a LAN
> with only one feed. You don’t want to hard code the vendor’s DNS
> resolvers into all your machines. Before someone says it… The extra
> time this adds is negligible.
>
> Interleaving would help, if you have to, yes. But first find out if
> either of the vendors allows external access (use by anyone, not just
> those in their own address space). Most ISP’s don’t, but some do.
>
> Also, you could consider using some of the “public” DNS resolvers
> which are open to all, like the ones which Google offers. I have found
> this to be a bad idea, in general, since the extra latency to reach
> them surpasses any benefit.
>
> Finally, you could set up your own DNS resolver inside the LAN.
>

--
"Neither the wisest constitution nor the wisest laws will secure the liberty
and happiness of a people whose manners are universally corrupt."
Samuel Adams, essay in The Public Advertiser, 1749 ___________________ Nolug
mailing list nolug@nolug.org
___________________
Nolug mailing list
nolug@nolug.org