1、实验目的
现要求在两个局域网中分别搭建各自的DNS服务器，并通过相关设置，使得两个DNS服务器能相互解析
2、实验拓扑
3、实验分析
要使两个不同网络的DNS服务器能相互访问，需要额外假设一台DNS服务器，同时作为网关
4、实验步骤
（1）搭建如图所示基础网络
使得alice能访问bob（参考Linux基础网络搭建实验）
（2）在alice（192.168.0.253）上
1）安装DNS服务器（参考：配置Yum源）
[root@lyy yum.repos.d]# yum install bind -y
2）配置主配置文件
[root@lyy yum.repos.d]# gedit /etc/named.conf
options { listen-on port 53 { 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; }; forward only; //即使有根服务器，也不询问，转发给上层DNS服务器 forwarders {192.168.0.254;}; //转发对象（上层DNS）的地址 }; zone "alice.com" IN { type master; file "named.alice.com"; }; zone "0.168.192.in-addr.arpa" IN { type master; file "named.192.168.0"; };
3）正解文件
[root@lyy yum.repos.d]# cd /var/named/ [root@lyy named]# touch named.alice.com [root@lyy named]# gedit named.alice.com
$TTL 3H @ IN SOA master.alice.com. admin.mail.alice.com. ( 0 ; serial 1D ; refresh 1H ; retry 1W ; expire 3H ) ; minimum @ IN NS master.alice.com. master.alice.com. IN A 192.168.0.253 @ IN MX 10 mail.alice.com. mail.alice.com. IN A 192.168.0.253 ftp.alice.com. IN CNAME master.alice.com. www.alice.com. IN CNAME master.alice.com. client.alice.com. IN A 192.168.0.10 nfs.alice.com. IN A 192.168.0.11
4）反解文件
[root@lyy named]# touch named.192.168.0 [root@lyy named]# gedit named.192.168.0
$TTL 3H @ IN SOA master.alice.com. admin.mail.alice.com. ( 0 ; serial 1D ; refresh 1H ; retry 1W ; expire 3H ) ; minimum @ IN NS master.alice.com. 253 IN PTR master.alice.com. 253 IN PTR mail.alice.com. 10 IN PTR client.alice.com. 11 IN PTR nfs.alice.com.
5）防火墙设置
[root@lyy named]# iptables -I INPUT -i eth0 -p udp --dport 53 -j ACCEPT [root@lyy named]# iptables -I INPUT -i eth0 -p tcp --dport 53 -j ACCEPT
6）启动DNS服务
[root@lyy named]# service named start
（3）在bob（202.3.4.253）上
1）安装DNS服务器
2）主配置文件
options { listen-on port 53 { 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; }; forward only; //即使有根服务器，也不询问，转发给上层DNS服务器 forwarders {202.3.4.254;}; //转发对象（上层DNS）的地址 };
zone "bob.com" IN { type master; file "named.bob.com"; }; zone "4.3.202.in-addr.arpa" IN { type master; file "named.202.3.4"; };
3）正解文件（参考alice）
$TTL 3H @ IN SOA master.bob.com. admin.mail.bob.com. ( 0 ; serial 1D ; refresh 1H ; retry 1W ; expire 3H ) ; minimum @ IN NS master.bob.com. master.bob.com. IN A 202.3.4.253 @ IN MX 10 mail.bob.com. mail.bob.com. IN A 202.3.4.253 ftp.bob.com. IN CNAME master.bob.com. www.bob.com. IN CNAME master.bob.com. client.bob.com. IN A 202.3.4.10 nfs.bob.com. IN A 202.3.4.11
4）反解文件
$TTL 3H @ IN SOA master.bob.com. admin.mail.bob.com. ( 0 ; serial 1D ; refresh 1H ; retry 1W ; expire 3H ) ; minimum @ IN NS master.bob.com. 253 IN PTR master.bob.com. 253 IN PTR mail.bob.com. 10 IN PTR client.bob.com. 11 IN PTR nfs.bob.com.
5）防火墙设置
[root@lyy named]# iptables -I INPUT -i eth0 -p udp --dport 53 -j ACCEPT [root@lyy named]# iptables -I INPUT -i eth0 -p tcp --dport 53 -j ACCEPT
6）启动DNS服务
[root@lyy named]# service named start
（4）在网关（com）上
1）安装DNS服务
2）主配置文件
options { listen-on port 53 { 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; }; allow-transfer {none; }; }; zone "." IN { type hint; file "named.ca"; }; zone "com" IN { type master; file "named.com"; };
3）正解文件
[root@lyy yum.repos.d]# cd /var/named/ [root@lyy named]# touch named.com [root@lyy named]# gedit named.com
$TTL 3H @ IN SOA master.com. admin.mail.com. ( 0 ; serial 1D ; refresh 1H ; retry 1W ; expire 3H ) ; minimum @ IN NS master.com. master.com. IN A 192.168.0.254 alice.com. IN NS master.alice.com. master.alice.com. IN A 192.168.0.253 bob.com. IN NS master.bob.com. master.bob.com. IN A 202.3.4.253
注意：（com）不需要反解文件
4）防火墙设置
[root@lyy named]# iptables -I INPUT -p udp --dport 53 -j ACCEPT [root@lyy named]# iptables -I INPUT -p tcp --dport 53 -j ACCEPT
5）启动DNS服务
5、结果测试
（1）在alice.com的DNS Server上测试
[root@lyy named]# dig -t mx bob.com
（2）在bob.com的DNS Server上测试
[root@lyy named]# dig -t mx alice.com
可以看到，alice和bob的邮件记录能相互解析，实验成功！
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