Topic: public dns look-up

[gordonj]

hi,
Which public dns servers does the local server contact to resolve names.The question is does it have pre setup servers it will contact , or does it send a "broadcast" to find the public dns servers in the country.

We had about 5 sme servers stop resolving names this morning , all then started resloving again about 3 hours later at the same time.

If the public dns servers a pre-set-up , where do I change it.

Gordon.

[arne]

Sme runs its own dns server that is fetching its datas from dns root servers like .net .com .org .no and .dk If the dns resolving stopped up this should not be because of "the default dns server" vere out of service. Some other comunication problem should be the reason, I would guess.

[p-jones]

I thought the upstream DNS Server was defined during the setup process and would usually be something like the ISP's DNS or a another public authorative DNS server. For a group of SME servers to all loose and regain DNS would suggest (a) the required DNS information was not already cached and (b)the upstream server, as defined at setup was not available to service DNS requests. One would guess from this outcome that maybe all the servers point to the same upstream DNS server (??)

[arne]

Most of the SME server I have set up have been set up with the use of manual configuration and not automtaically configuration via dhcp. I am quite sure that I never have configured in a external dhpc server when I have made such a monual configuration. Still the SME servers dns server have worked ok, receiving its updats/datas from the internet root servers (.com .net .org etc).

I'm also rather sure that I have set up some other distros the same way and that this also have worked.

On the other hand .. if the the SME server is set up parts of its configuration datas via dhcp, theoretically, I think it is quite possible that It could be configured to use the ISP's dns server (But I would not expect that to happen.)

My latest home server is actually set up using dhcp to receice the config datas ..

Anybody who remember the command to se which dns server(s) it eventually should be using ?? (Will check it if I just remember the command.)

[arne]

I still don't remember the command, but I went into the file /etc/resolve on the sme 7.0 b4 server. It has this content:

domain <mydomain.org>
nameserver 10.0.0.1

I think this shows that it does not resolve to external dns servers ?? (Exept for the root servers) ??