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DNS Servers are on Different Subnets

What you see when your domain has this problem
Name Servers are on the Same Subnet Details area Ignore
Monitor, detect and fix real world problems with your SPF and DKIM configuration

More Information About Dns Servers Are On Different Subnets

If we detect that you have more than one name server in the same class C subnet (the first three numbers of their IP are the same), we will issue this warning.

Having more than one (1) name server in the same class C subnet is not recommended, as this increases the likelihood of a single failure disabling all of your name servers.

Additional Information

If your servers are actually dispersed or you have other means in place to generate redundancy in your DNS, you can feel free to filter this warning with our Custom Filters settings.

RFC 2182:

Secondary servers must be placed at both topologically and
geographically dispersed locations on the Internet, to minimise the
likelihood of a single failure disabling all of them.

That is, secondary servers should be at geographically distant
locations, so it is unlikely that events like power loss, etc, will
disrupt all of them simultaneously.  They should also be connected to
the net via quite diverse paths.  This means that the failure of any
one link, or of routing within some segment of the network (such as a
service provider) will not make all of the servers unreachable. 
[RFC 2182]

 

DMARC is the key to improving Email Deliverability!

Email is the key to your customer communication strategy. But, what is your email reputation?

Setting up and managing your DMARC configuration is the key to getting insight into your email delivery. MxToolbox is the key to understanding DMARC.

MxToolbox Delivery Center gives you:

  • Who is sending phishing email purporting to be from your domain
  • What is the reputation of your domains and delegated IPs
  • Where other senders are and What their reputations are
  • How your SPF, DKIM and DMARC setup is performing
  • What on-going maintenance you need to maintain and improve your email deliverability

  Learn More

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