有两台邮件服务器分别为192.168.1.1(windows下主机名为b.test.cn)和192.168.1.3(linux下主机名为a.test.com)。
在linux下装备DNS服务器，下面是装备过程中设置过的一些文件，
/etc/hosts 文件的具体内容如下：
# Do not remove the following line， or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost fc4
192.168.1.3 a.test.com a
192.168.1.1 b.test.cn b
/etc/host.conf 文件：
order hosts，bind
表明先用hosts文件做解析，在用DNS解析
/etc/resolv.conf 文件：
; generated by NetworkManager， do not edit!
search test.com
nameserver 127.0.0.1
search test.cn
nameserver 192.168.1.1
nameserver 61.144.56.100
/etc/named.conf 文件：
//
// named.conf for Red Hat caching-nameserver
//
options {
directory /var/named;
dump-file /var/named/data/cache_dump.db;
statistics-file /var/named/data/named_stats.txt;
/*
* If there is a firewall between you and nameservers you want
* to talk to， you might need to uncomment the query-source
* directive below. Previous versions of BIND always asked
* questions using port 53， but BIND 8.1 uses an unprivileged
* port by default.
*/
// query-source address * port 53;
};
//
// a caching only nameserver config
//
controls {
inet 127.0.0.1 allow { localhost; } keys { rndckey; };
};
zone . IN {
type hint;
file named.ca;
};
zone test.comIN {
type master;
file test.com;
allow-update { none; };
};
zone 1.168.192.in-addr.arpaIN {
type master;
file 192.168.1.rev;
allow-update { none; };
};
zone test.cnIN {
type master;
file test.cn;
allow-update { none; };
};
zone 0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa IN {
type master;
file named.ip6.local;
allow-update { none; };
};
zone 255.in-addr.arpa IN {
type master;
file named.broadcast;
allow-update { none; };
};
zone 0.in-addr.arpa IN {
type master;
file named.zero;
allow-update { none; };
};
include /etc/rndc.key;
在/var/name/test.com 文件下：
$TTL 86400
@ IN SOA a.test.com. root.a.test.com (
42 ; serial (d. adams)
3H ; refresh
15M ; retry
1W ; expiry
1D ) ; minimum
IN NS a.test.com.
IN MX 10 mail.test.com.
a IN A 192.168.1.3
mail IN A 192.168.1.3
//其间root.a.test.com的意义是管理员的邮箱
/var/name/test.cn 文件下：
$TTL 86400
@ IN SOA b.test.cn. root.a.test.com (
42 ; serial (d. adams)
3H ; refresh
15M ; retry
1W ; expiry
1D ) ; minimum
IN NS b.test.cn.
IN MX 10 mail.test.cn.
b IN A 192.168.1.1
mail IN A 192.168.1.1
/var/name/192.168.1.rev 文件下：
$TTL 86400
@ IN SOA 1.168.192.in-addr.arpa. root.test.com. (
1997022700 ; Serial
28800 ; Refresh
14400 ; Retry
3600000 ; Expire
86400 ) ; Minimum
IN NS a.test.com.
IN NS b.test.cn.
IN MX 10 mail.test.com.
IN MX 10 mail.test.cn.
3 IN PTR a.test.com.
3 IN PTR mail.test.com.
1 IN PTR b.test.cn.
1 IN PTR mail.test.cn.
然后用/etc/init.d/named restart重启DNS服务，在重启过程中，我从前呈现过好几回的过错，依照犯错的提示，会提示是named.conf文件第几行犯错的。或许提示在那些包含文件例如test.cn这些文件里边的问题，然后一个一个扫除。
最终还有一些nslookup的指令比较有用：
set all用于显现运用nslookup东西这台机器上的DNS服务器的一些信息
set type=any会显现完好信息包含域中邮件服务器和主从DNS服务器的姓名和IP地址
server 192.168.0.1替换查询的DNS服务器地址。
