Stu Fleming wrote:
I have a...friend, let's say...who operates a DNS server at a small ISP. In a few of the zone files, there are A records that resolve to IP addresses outside of the Class C that my..friend...controls. My friend has been told that this is "against the rules" and that it is "causing problems".
Questions: - is resolving an A record outwith the delegated IP range "against the rules"? - if so, is there any documentation of the rules? - what potential problems could this cause to the network that contains the IP address to which the A records point?
If you mean you are responsible, for say, example.net, and you set up this.example.net. IN A 192.0.2.1 and 192.0.2.1 is not one of your controlled IP addresses... you aren't breaking any rules as far as I've ever heard of. The only circumstance I could see is where you are causing unwanted traffic (e.g. pointing MX or A to an MX host which doesn't want to relay for your domain, etc). aj.