Reverse DNS: Difference between revisions

m (→‎About Reverse DNS: accessibility- <code> markup)
m (→‎1. Auto Reverse (The Default): accessibility-code markup)
==1. Auto Reverse (The Default)==
 
Auto reverse is the default option that works by AAISP filling in a PTR record for each IP4IPv4 address and a corresponding forward A record as well so that all of your IP addresses will have a valid reverse entry automatically. This is mainly for customers who are not interested in setting up any reverse entries but need something in place to avoid problems with some servers. If you also use A+reverse records in a domain then your IPs will have two PTR records, both valid.
 
Most ADSL customers will have a small block of IPs which they can delegate using CNAME if they want. However all ADSL lines also have a single IP address for the external (WAN) side of their [[ADSL Router|ADSL router]]. This is always delegated as a single zone for the IP address.
 
e.g.:
if you have the IPs <code>192.0.2.1</code> and <code>2001:DB8::1</code> reverses will be created of:
<code>1.2.0.192.in-addr.arpa</code>
<code>1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa</code>
 
==2. A+Reverse or AAAA+Reverse on a Domain We Host ==
Retrieved from ‘http://support.aa.net.uk/Reverse_DNS’