8
votes
1answer
114 views

Is there an official limit to nameserver indirection?

Glue records are typically unavailable if a domain and its nameserver don't share a TLD, and technically aren't required if they don't share the same second-level domain, which could lead to extra ...
0
votes
1answer
110 views

SMTP - Routing in RFC 821 and RFC 2821

RFC 821 indicates that the MAIL verb can be given a <forward-path> argument of the form "@ONE,@TWO:JOE@THREE" to indicate intermediate routing hosts (@ONE,@TWO) and the final receiver of the ...
1
vote
3answers
1k views

SLAAC and DNS, no really - what's the deal?

So I know that there are extensions to SLAAC in the works to enable DNS discovery via RAs (RFC 6106). But what was the original intent? How did the IPv6 designers envision things working without ...
1
vote
1answer
307 views

setting up subdomain in IIS/DNS - possible incorrect subdomain structure

I am trying to create a subdomain in DNS, however it doesn't appear to be working. I am getting the standard Unable to determine IP address from host name for aa.00.website.com The domain name does ...
0
votes
2answers
200 views

PTR to domain, A record for domain

Does PTR pointing to domain is forbidden? If so - which RFC states that. The same with A record pointing at the domain. As I see, usually, people are trying to avoid such configurations. But I would ...
10
votes
5answers
2k views

Are one-letter host names valid?

RFC-952 (last sentence of point 1 under Assumptions) prohibits single-character host names and I have had experiences (over 7 years ago summer of 2002) where some services would refuse to work with ...
2
votes
3answers
2k views

Can a CNAME be a hostname

This is bit of a theological question, but nonetheless... So, a server has a hostname, let's say the fqdn is hostname.example.com (to be really precise about what I mean, this is the name that is set ...
6
votes
2answers
4k views

DNS using CNAMEs breaks MX records?

We are trying to move all our websites we host to CNAMES as we are planning on moving servers in the new year and would like the ability to move some clients to one server and other clients somewhere ...
11
votes
7answers
3k views

Check public DNS health and RFC compliance

Every now and again I like to run checks on my DNS servers to make sure they are running right and to RFC spec. I used to use the DNSTools website to do this as it gave me a pretty good picture of ...