On Tue, 22 Nov 2005, 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?
No. Depends exactly what the DNS is being used for though. If you pointed www.dodgy.co.nz at 203.57.241.200 [1] for example then you might have the owner of that IP after you. However if the IPs owner doesn't mind there isn't anything wrong and even then it is probably okay. If you are just pointing www.somedomain.co.nz at the web hosting company that is hosting somedomain's website then that is 100% normal and very common.
- what potential problems could this cause to the network that contains the IP address to which the A records point?
If depends what people use the records for really. I could create an A record off darkmere.gen.nz records for every IP in 202/7 but it would affect everybody. On the other hand if I setup a RBL (that people used) and put Ihug's mail server in it then it might cause a problem. [1] One of the BNZ's web servers. DNS picked at random. -- Simon J. Lyall | Very Busy | Web: http://www.darkmere.gen.nz/ "To stay awake all night adds a day to your life" - Stilgar | eMT.