Note: There are some issues with this Howto, too numerable to fix quickly, and it requires bringing up to standard. in all other places, the document uses the machine name example ns.
This process is referred to as , which finally will return the IP address we require.
Sometimes it also useful to be able to start with an IP address and find the name allocated to it; email systems especially use this technique as part of an antispam arsenal.
To troubleshoot this process, enable query logging, update logging, xfer in/out logging and notify logging on all DNS Servers that host the zone and verify that the flow of DNS packets described in steps 1-5 can be seen in the logs in the correct order.
Version: 1.0 - aug 23, 2006 In this howto we will install 2 bind dns servers, one as the master and the other as a slave server.
DNS is a complex, highly distributed system that operates on the hierarchical structure of domain names, so it is worth briefly covering some background.
In tech speak, DNS resolves a name (domain name) into an IP address using a series of queries to authoritative DNS servers until the final answer, an IP address, is obtained.
Debiantest1 has an IP of 192.1 Debiantest2 has an IP of 192.1 (Needed only for the master / slave setup described at the bottom of the guide) DNS lookups/queries runs on port 53 UDP, and zone transfers runs on port 53 TCP.
Normally port 53 UDP should be enough to forward for external access, but if you have replicating DNS servers and zone transfers you should open for 53 TCP between the replication DNS partners as well.
Feature: Automatically increase SOA serial number when a DNS zone managed by Identity Management any record in the zone is updated.
This feature takes advantage of and requires persistent search data refresh mechanism, which is enabled by default in the Identity Management server install script.
by Ron Aitchison 04/26/2007 Here are five things you can do to make sure your DNS is in good shape and not causing problems for the rest of the Internet, which, by the way, also includes you.