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I have made a verification of a site of mine via intodns.com.

I have received the following warnings:

Different subnets - WARNING: Not all of your nameservers are in different subnets
Different autonomous systems- WARNING: Single point of failure
SOA MNAME entry - WARNING: SOA MNAME (mydomain.com) is not listed as a primary nameserver at your parent nameserver!

Does anyone know how to fix these? I see that many domains are having these issues. Apparently, they are working fine (including my site). I just want to know if I should be worried about this.

Thanks in advance, Gabriel

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migrated from stackoverflow.com Dec 2 '09 at 15:07

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1 Answer

I'll try to tell you what they mean - point by point

Different subnets: WARNING: Not all of your nameservers are in different subnets
What this means is that your nameservers exist on the same subnet. If this network is to go down, people will not be able to resolve your DNS.

Different autonomous systems- WARNING: Single point of failure
Basically the same as the last one, except this means that your DNS servers use the same "AS". An "AS" is a routing term used in BGP. Basically, an AS is a "network" on the internet. If your nameserves are in the same AS, and the internet connection to that AS drops, your nameservers once again become unreachable.

SOA MNAME entry - WARNING: SOA MNAME (mydomain.com) is not listed as a primary nameserver at your parent nameserver!
This one you can actually fixquite easily. The SOA record looks like this:

;; ANSWER SECTION:
google.com. 	86400	IN	SOA	ns1.google.com. dns-admin.google.com. 1399740 7200 1800 1209600 300

You have the domain name, TTL, protocol, record type. Then "mname" which should be the name of the PRIMARY domain name server, followed by "rname" which is the zone admin email (using a . instead of an @) and then serial #, refresh, retry, expire, and a default Time-To-Live for records.

Your domains mname should be the primary name server.

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