zonecheck - question

[Markus Ferlitsch]

Ok, thanks for detailed explication!




2010/11/16 Remco Rijnders <remco at webconquest.com>

> On Tue, Nov 16, 2010 at 04:01:50PM +0100, Markus Ferlitsch wrote:
> > today I have tried a zonecheck.
> >
> > What does this warning means?
> >
> > ----
> > *
> > Nameservers are all part of the same AS*
> >
> >    - *Adv: ZoneCheck
> >    *
> >
> >    *To avoid losing all connectivity with the authoritative DNS in case
> of a
> >    routing problem inside your Autonomous System, it is advised to host
> the DNS
> >    on different AS.*
> >
> >
> >    -
> >
> >    *All the nameservers are part of the same Autonomous System (AS number
> >    6830), try to have some of them hosted on another AS.*
> >
> >
> >    - *generic*
> >
> > ----
> >
> > Some months ago I didn't get this warning - but I also didn't change my
> > maradns settings - it seems that the zonecheck-tool got some upgrade.
> >
> > PS: I use three maradns servers - 2 static IPs are from one provider in
> > different towns and the thiwd server ist hosted at any other provider.
>
> Hi Markus,
>
> You can safely ignore this warning. It just means that all 3 IP addresses
> are owned / controlled by the same entity (UPC). Should UPC have a major
> routing issue, your DNS might become unavailable (but I guess at that time
> your ISP will be well aware of that issue!). As long as the servers are in
> different locations (different datacenters in different cities) you'll
> most likely be ok.
>
> If you run mara on a unix box, and have the 'whois' program installed, you
> can run for fun: whois AS6830 . You'll see this is quite big a network
> object importing many other AS objects. I guess the zonecheck warning
> comes from this.
>
> Cheers,
>
> Remco
>