Dns slave not updating
Some of the problems caused by weak name resolution include inability to locate resources (including domain controllers), excessive waits to connect to resources, time-outs, and so on.However, you will need to implement a DNS infrastructure to allow external clients to connect to extranet resources if you plan to make a Share Point or other server, such as Exchange, available to extranet clients.Most prominently, it translates more readily memorized domain names to the numerical IP addresses needed for locating and identifying computer services and devices with the underlying network protocols.By providing a worldwide, distributed directory service, the Domain Name System is an essential component of the functionality on the Internet, that has been in use since 1985.We do this because, the secondary DNS will start to fetch the queries if primary server is down. Let us now create the zone files which we defined in the previous step. ( 2011071001 ; Serial 3600 ; Refresh 1800 ; Retry 604800 ; Expire 86400 ; Minimum TTL ) @ IN NS pri. @ IN A 192.168.1.200 @ IN A 192.168.1.201 @ IN A 192.168.1.202 pri IN A 192.168.1.200 sec IN A 192.168.1.201 client IN A 192.168.1.202$TTL 86400 @ IN SOA pri. ( 2011071002 ; Serial 3600 ; Refresh 1800 ; Retry 604800 ; Expire 86400 ; Minimum TTL ) @ IN NS pri. Finally, reboot your system to take effect the all changes.First let us create forward zone file as shown below. As I mentioned already, we use “dig” or “nslookup” commands to test DNS server.
DNS servers can be hardened to mitigate common DNS threats. By updating a stub zone for one of its child zones regularly, the DNS server that hosts both the parent zone and the stub zone will maintain a current list of authoritative DNS servers for the child zone. This section describes the following resource records: 1. Stub zones enable a DNS server to perform recursion using the stub zone's list of name servers, without having to query the Internet or an internal root server for the DNS namespace. However, stub zones do not serve the same purpose as secondary zones, and they are not an alternative for enhancing redundancy and load sharing. Different types of resource records can be used to provide DNS-based data about computers on a TCP/IP network.What is Primary name server or primary master server?Primary name server/primary masteris the main data source for the zone. This server acquires data about its zone from databases saved on a local disk.