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host fantasia # You can declare a class of clients and then do address allocation # based on that.

The example below shows a case where all clients # in a certain class get addresses on the /24 subnet, and all # other clients get addresses on the 10.0.29/24 subnet.

in terminal,type Configure client to receive address from our DHCP server: Edit interface file: TYPE=”Ethernet” BOOTPROTO=“dhcp” DEFROUTE=”yes” IPV4_FAILURE_FATAL=”no” IPV6INIT=”yes” IPV6_AUTOCONF=”yes” IPV6_DEFROUTE=”yes” IPV6_FAILURE_FATAL=”no” NAME=”ens3″ UUID=”405213a0-56f5-4d45-b21e-244b19f7c3ef” ONBOOT=”yes” HWADDR=”:14:3f:47″ PEERDNS=”yes” PEERROUTES=”yes” IPV6_PEERDNS=”yes” IPV6_PEERROUTES=”yes” restart network,and type ifconfig: [email protected] ~]# ifconfig ens3: flags=41 inet netmask broadcast inet6 fe80::5054:ff:fe14:3f47 prefixlen 64 scopeid 0x20 ether :14:3f:47 txqueuelen 1000 (Ethernet) RX packets 676 bytes 72259 (70.5 Ki B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 2222 bytes 142855 (139.5 Ki B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 we got address from our range ( Switch to server and check log file: Now we can finally set Dynamic DNS Updates DNS client computers can use dynamic update to register and dynamically update their resource records with a DNS server whenever changes occur.

This reduces the need for manual administration of zone records, especially for clients that frequently move or change locations and use Dynamic Host Configuration Protocol (DHCP) to obtain an IP address,to do it securely, wee need to first create a secret key. The file is most useful,open the file: The selected part will be used for authentication: Let’s configure our dhcp server for Secure DNS updates: make changes to file (I bold updates) # # # Sample configuration file for ISC dhcpd # # option definitions common to all supported networks…

I put datetime as number,followed with 01 at the end,you can put any number you like Refresh: Indicates the time when the slave will try to refresh the zone from the master (if we have another DNS server which transfers zone files from master server) Retry: Defines the time between retries if the slave (secondary) fails to contact the master when refresh (above) has expired Expire: Indicates when the zone data are considered incorrect by slave server,then slave tries to get update from master server Minimum: defines the duration in seconds that the record may be cached We don’t have slave server so accept default values @ IN NS server1.

don’t forget period at the end,if you ommit it then server name would be appended at the end (server1.server1-is Name server for zone (our server) server1 IN A host (A) record our server Copy that file as reverse.db (zone file for our reverse lookup zone) @ IN SOA server1. ( 2015052601 ; serial 1D ; refresh 1H ; retry 1W ; expire 3H ) ; minimum @ IN NS server1.

class “foo” shared-network 224-29 Lease info is written in leases files in /var/lib/dhcpd folder: [[email protected] dhcpd]# ls dhcpd6.leases dhcpd.leases dhcpd.leases~ Now edit named.conf: (Changes bolded) acl “allowed” ; options ; logging ; key dhcp_updater ; zone “.” IN ; include “/etc/named.rfc1912.zones”; include “/etc/key”; zone “122.168.192.in-addr.arpa” IN ; zone “example.com” IN ; But,we are not done yet, We now must configure SELinux policy to allow user named to create journal files chcon -R -t dnssec_trigger_var_run_t ‘/var/named/chroot/etc/named/’ othervise,we’ll receive this error: Check system time on the server (if it’s not synchronized with time server you won’t be able to access the internet Now restart named and dhcpd service on server,and network service on client and check log file on server,client should be updated in db file: $ORIGIN .

This page describes using and configuring DHCP for IPv4 (DHCPv4) and IPv6 (DHCPv6) to enable automatic updating of both the forward and reverse mapping zone file.

The chroot is a process of creating a virtualized environment in Linux, separating it from operating system and directory structure.

#subnet netmask # This declaration allows BOOTP clients to get dynamic addresses, # which we don’t really recommend.

#subnet netmask # A slightly different configuration for an internal subnet.

Install packages: Then edit /etc/file acl “allowed” ; options ; logging ; zone “.” IN ; include “/etc/named.rfc1912.zones”; include “/etc/key”; zone “122.168.192.in-addr.arpa” IN ; zone “example.com” IN ; check config files for typo errors: of course,at this moment it’ll throw errors that files and reverse.db cannot be found,they don’t exist (yet). Template zone file is located at /usr/share/doc/bind-9.9.4/sample/var/named/named.localhost we can use it as a template for our zone files.

Copy that file to /var/named/chroot/etc/named/ and save as db open db file in your favorite text editor and start editing: @ IN SOA server1. ( 2015052601 ; serial 1D ; refresh 1H ; retry 1W ; expire 3H ) ; minimum @ IN NS server1.

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