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; host and canonical name records mail IN CNAME ns1.www IN A 192.168.1.100 ftp IN A 192.168.1.100 [[email protected] ~]# named-checkzone /var/named/for zone elinuxbook.com/IN: loaded serial 2010031403 OK [[email protected] ~]# named-checkzone /var/named/rev zone elinuxbook.com/IN: loaded serial 2010031402 OK [[email protected] ~]# yum -y install bind Loaded plugins: fastestmirror, refresh-packagekit, security Setting up Install Process Loading mirror speeds from cached hostfile * base: centos.* extras: centos.* updates: centos.Resolving Dependencies -- Finished Dependency Resolution Dependencies Resolved ================================================================================ Package Arch Version Repository Size ================================================================================ Installing: bind x86_64 32:9.8.2-0.47.rc1.el6_8.3 updates 4.0 M Updating for dependencies: bind-libs x86_64 32:9.8.2-0.47.rc1.el6_8.3 updates 890 k bind-utils x86_64 32:9.8.2-0.47.rc1.el6_8.3 updates 187 k Transaction Summary ================================================================================ Install 1 Package(s) Upgrade 2 Package(s) Total download size: 5.0 M Downloading Packages: (1/3): bind-9.8.2-0.47.rc1.el6_8.3.x86_64| 4.0 MB (2/3): bind-libs-9.8.2-0.47.rc1.el6_8.3.x86_64| 890 k B (3/3): bind-utils-9.8.2-0.47.rc1.el6_8.3.x86_64| 187 k B ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Total 130 k B/s | 5.0 MB Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Updating : 32:bind-libs-9.8.2-0.47.rc1.el6_8.3.x86_64 1/5 Updating : 32:bind-utils-9.8.2-0.47.rc1.el6_8.3.x86_64 2/5 Installing : 32:bind-9.8.2-0.47.rc1.el6_8.3.x86_64 3/5 Cleanup : 32:bind-utils-9.8.2-0.47.rc1.el6.x86_64 4/5 Cleanup : 32:bind-libs-9.8.2-0.47.rc1.el6.x86_64 5/5 Verifying : 32:bind-utils-9.8.2-0.47.rc1.el6_8.3.x86_64 1/5 Verifying : 32:bind-libs-9.8.2-0.47.rc1.el6_8.3.x86_64 2/5 Verifying : 32:bind-9.8.2-0.47.rc1.el6_8.3.x86_64 3/5 Verifying : 32:bind-libs-9.8.2-0.47.rc1.el6.x86_64 4/5 Verifying : 32:bind-utils-9.8.2-0.47.rc1.el6.x86_64 5/5 Installed: bind.x86_64 32:9.8.2-0.47.rc1.el6_8.3 Dependency Updated: bind-libs.x86_64 32:9.8.2-0.47.rc1.el6_8.3 bind-utils.x86_64 32:9.8.2-0.47.rc1.el6_8.3 Complete!

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When you create a new primary zone on one server (master server), all slave servers (the "Super Slaves" list) will be notified that there is now a new zone available.When a slave server receives such a notification, it first checks its master list (those listed in "Super Masters") to validate the master, then requests update information and creates the zone (as secondary).Balamukunda Sahu This is Balamukunda Sahu the Founder and Editor of ELinux Book have 5 years of Industrial Experience.I thankful to all our website viewers who encourage me to write quality posts and articals, Keep visit to our site and I will bring all latest Linux Tutorials, Updates and News for you.It uses this list to synchronize both individual zones and the zone list.

If you have a lot of zones (thousands) you may want to enforce long "Refresh" values on secondary zones (see Secondary Zones section) in order to reduce synchronization traffic between the DNS servers.Poorly constructed NS records pose a security risk because they create conditions under which an adversary might be able to provide the missing authoritative name services that are improperly specified in the zone file.The adversary could issue bogus responses to queries that clients would accept because they learned of the adversary's name server from a valid authoritative name server, one that need not be compromised for this attack to be successful.If the NS server does not respond at all or responds with a non-authoritative answer, this is a finding.If DNS servers are AD-integrated, troubleshoot and remedy the replication problem where the non-responsive name server is not getting updated. Select the NS record for the non-responsive name server and remove the record.So everything looks good and Slave/Secondary DNS Server is working fine as shown on the testing output’s above.