[iyonix-support] Re: Success (was No Internet now)
- From: Alan Adams <alan.adams@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
- To: iyonix-support@xxxxxxxxxxxxx
- Date: Mon, 10 Mar 2008 22:10:25 GMT
In message <1fbf0c7e4f.GrahameParish@xxxxxxxxxxxxxx>
Grahame Parish <grahame.parish@xxxxxxxxxxxxxxx> wrote:
> In message <Marcel-1.53-0310110652-1cbpErr@xxxxxxxxxxxxxxxxxxxxxx>
> Chris Evans <chris@xxxxxxxxxxxxxxx> wrote:
>>
>> You can also manually set the the DNS in each computer with the DNS quoted
>> by your ISP.
>>
>>
>> Chris Evans
>>
> But don't make your ISP's DNS the main one if you also need to resolve
> internal addresses. Set the internal network DNS as the first to
> check, followed by the ISP's DNS as the secondary (and tertiary if
> they give you two DNS addresses).
Are you thinking of a local network with a real DNS server? i.e. not
using the router as a DNS relay?
In such a case the internal DNS server needs to have forwarders
configured for the external DNS servers.
There is a persistent misunderstanding of the purpose of second and
third DNS entries. DNS doesn't query servers in turn until it gets an
answer. DNS tries to connect to servers in turn until it gets a
connection, then uses that connection alone for its queries. Thus if
your router is set as the first server, there is no point in having
second or third, because if DNS can't connect to the router, it won't
be able to connect through the router to get to the others.
(Actually there is one case where it could be useful. If you have a PC
running Internet Connection Sharing, and use that as a backup if the
router fails. In that case you can get to the second and third
servers, via the PC. However the connection will only work once you
have reconfigured your RISC OS machine, changing the gateway to point
to the PC, so you could reconfigure DNS at the same time.)
The local real DNS server situation is different. Here the client
queries the local server always. If the local server doesn't know the
answer it forwards the query, and caches the reply for future use.
Such a real DNS server is likely to be running on Linux or Windows
server edition.
--
Alan Adams, from Northamptonshire
alan.adams@xxxxxxxxxxxxxxxxxxxxxxxxxxx
http://www.nckc.org.uk/
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