DDNS configuration in Linux

1. Experimental topological structure

Fig. 1 Experimental topological diagram

2. Project Requirements

The system is built to dynamically update DNS information for the Web server.

3, Project development ideas (mind map)

Figure 2 DDNS Experimental Mind Mapping

4. Experimental steps (1) Basic network construction

DHCP server can ping DNS server

Figure 3 Network Connectivity test

(2) on the DNS server

1) Installing the DNS service

[[Email protected] Desktop]# yum install bind-y

2) Generate key

[[Email protected] Desktop]# mkdir key

[[Email protected] Desktop]# CD key/

[Email protected] key]# dnssec-keygen-a hmac-md5-b 512-n HOST www

kwww.+157+55680

[[email protected] key]# ls

Kwww.+157+55680.key kwww.+157+55680.private

[email protected] key]# cat Kwww.+157+55680.key

Www. In KEY 3 157 7MTHFLORKZ+UJGSGK7XMKXYKDXM+NZP49CITZ+NJEMQAJYAWKK8LTTPW 8anc+pmp8hxgu2qk5hf4zlaqf4dzsw==

3) Configuring the Master profile named.conf

Copy the generated public key (space stripped) to named.conf, and add the key field

Options {

Listen-on Port: (any;};

Directory "/var/named";

Dump-file "/var/named/data/cache_dump.db";

Statistics-file "/var/named/data/named_stats.txt";

Memstatistics-file "/var/named/data/named_mem_stats.txt";

allow-query {any;};

};

Key WWW {

Algorithm HMAC-MD5;

Secret "7mthflorkz+ujgsgk7xmkxykdxm+nzp49citz+njemqajyawkk8lttpw8anc+pmp8hxgu2qk5hf4zlaqf4dzsw==";

};

Zone "Xh27.com" in {

Type master;

File "named.xh27.com";

allow-update {

Key www;

};

};

Zone "0.168.192.in-addr.arpa" in {

Type master;

File "named.192.168.0";

allow-update {

Key www;

};

};

4) Add a positive solution file

[[Email protected] Desktop]# cd/var/named/

[email protected] named]# Touch named.xh27.com

[Email protected] named]# gedit named.xh27.com

$TTL 3H

@ in SOA master.xh27.com. Admin.mail.xh27.com. (

0; Serial

1D; Refresh

1H; Retry

1W; Expire

3H); Minimum

@ in NS master.xh27.com.

Master.xh27.com. In A 192.168.0.253

5) Add anti-solution file

[email protected] named]# Touch named.192.168.0

[Email protected] named]# gedit named.192.168.0

$TTL 3H

@ in SOA master. Xh27.com. Admin.mail. Xh27.com. (

0; Serial

1D; Refresh

1H; Retry

1W; Expire

3H); Minimum

@ in NS master. Xh27.com.

253 in PTR Master. Xh27.com.

6) Firewall Open 53 port

[[email protected] named]# iptables-i input-i eth0-p UDP--dport 53-j ACCEPT

[[email protected] named]# iptables-i input-i eth0-p tcp--dport 53-j ACCEPT

7) Set SELinux

[Email protected] named]# setsebool-p Named_write_master_zones=1

Allow write to dynamically update files

8) Set folder permissions

[Email protected] named]# chmod g+w/var/named

[Email protected] named]# chown named/var/named

9) Start the DNS service

[[Email protected] named]# service named start

(3) on the DHCP server

1) Install DHCP service

[email protected] yum.repos.d]# Yum install dhcp-y

2) Configuring the DHCP master configuration file

[Email protected] yum.repos.d]# gedit/etc/dhcp/dhcpd.conf

Option Domain-name "xh27.com";

Option Domain-name-servers master.xh27.com;

Default-lease-time 600;

Max-lease-time 7200;

Ddns-update-style Interim;

Key WWW {

Algorithm HMAC-MD5; Secret "7mthflorkz+ujgsgk7xmkxykdxm+nzp49citz+njemqajyawkk8lttpw8anc+pmp8hxgu2qk5hf4zlaqf4dzsw==";

}

Zone Xh27.com {

Key www;

Primary 192.168.0.253;

}

Zone 0.168.192.in-addr.arpa {

Key www;

Primary 192.168.0.253;

}

Subnet 192.168.0.0 netmask 255.255.255.0 {

Range 192.168.0.50 192.168.0.150;

Option routers 192.168.0.254;

}

3) Setting up a DNS server

[Email protected] yum.repos.d]# gedit/etc/resolv.conf

NameServer 192.168.0.253

4) Start the DHCP service

[[Email protected] yum.repos.d]# service DHCPD start

(4) on the Web server

1) Set host name

[[Email protected] Desktop]# gedit/etc/sysconfig/network

Hostname=www

2) Restart Network Service

[Email protected] Desktop]# service network restart

[[Email protected] Desktop]# ifconfig

Figure 4 WEB server Gets the IP for the first time

5. Result Detection (1) on DHCP server

Change the IP address allocation range from 50-150 to 151-200 to restart the DHCP server

Figure 5 Modifying an assigned IP range

[Email protected] yum.repos.d]# service DHCPD restart

(2) on the Web server

1) Restart Network Service

Figure 6 WEB server Gets the IP for the second time

2) parsing www.xh27.com and 192.168.0.151

Figure 7 WEB server resolves the domain name and IP

(3) on the DNS server

1) View the obtained dynamic update file

[[Email protected] Desktop]# ll/var/named/

Figure 8 DNS View update file

2) View Log file

[[Email protected] Desktop]# gedit/var/log/messages

Figure 9 DNS View log file

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DDNS configuration in Linux