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  #1  
Old 09-23-2010, 06:09 AM
skoobi2 skoobi2 is offline
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Different subnets and reverss DNS


Hi just a quick question regarding DNS and subnets...
When i do a dns report on my domain it displays this warning message.

Code:
Different subnets-WARNING: Not all of your nameservers are in different subnets
Does this mean if i had a different ip address on ns2.mydomain.com from somewhere else that this will get rid of this message.

----------------

And the next question is how do i setup a reverse DNS on my server?? Does anyone know any good tutorials on how to do it through cpanel/whm... this is the message i get on the dns report...

Reverse MX A records (PTR) - ERROR: No reverse DNS (PTR) entries. The problem MX records are:

Cheers
Chris



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  #2  
Old 09-23-2010, 06:21 AM
skoobi2 skoobi2 is offline
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Right for sorting out the Reverse dns in cpanel i found this tutorial... It is really easy to follow and works a charm...

http://forums.cpanel.net/f5/rdns-rev...ial-69349.html

Now its just the Subnet thing

  #3  
Old 09-23-2010, 06:43 AM
nix101 nix101 is offline
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Your DNS has single point failure as you have only one DNS server running (its very common). If you want avoid this, you need to have one more fail over DNS.

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Old 09-23-2010, 06:45 AM
skoobi2 skoobi2 is offline
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Where would i get a fail-over dns from??? Been searching Google but there's so many different things for dns its a little overwhelming...

  #5  
Old 09-23-2010, 06:55 AM
nix101 nix101 is offline
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Why not use hosted DNS of your domain registrar? Many domain registrar like name.com offer this service at no extra cost.

  #6  
Old 09-23-2010, 07:01 AM
skoobi2 skoobi2 is offline
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Hmm.. Ill look into that now... im with enom they should do it..

  #7  
Old 09-23-2010, 07:16 AM
Daniel_G Daniel_G is offline
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The subnet complaint is purely because you have two (or more) nameservers, but both are running on either the same IP or IP addresses with the same subnet.

The reason the check (intodns.com I suspect) is flagging that up is because it assumes since the nameservers are in the same subnet, they are located in the same datacentre, so if something were to happen to that datacentre (power failure, network outage, etc), then all the nameservers would go down - hence, a single point of failure, and no one would be able to resolve to the sites you're hosting.

This isn't inhibiting the operation of your nameservers at all, it's just a warning.

Of course, this doesn't really make any difference at all if the services you're providing (web hosting I presume) are hosted in the same datacentre anyway, since if there was a failure at the datacentre it would knock your primary nameservers and hosting servers offline, so your redundant backup nameservers would kick in but they would be pointing to the offline hosting server anyway.

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