[实践Ok]在CentOS6.2下安装DNS并快速配置实例,共八步,心路历程如下:
背景介绍:
在日常的开发中,往往会在测试机和外网的Http的Url实际接口是不一样的,在测试机一个Url地址,在外网中又是一个地址。
这样在我们在开发时,在上线时就会去修改一下接口,在线下测试时用线下的Url接口,最后的情况是,在SVN的管理中会变得
很混乱,也就是在上线上的版本和线下测试的版本在改动上来回切换,版本号不段的切换,为此,为了解决这个问题,必须引入
自己建立一套内网测试系统的DNS来实现其和外网一样的环境,进而在实际开发中就不会出现因URL的接口包含的不同域名而导致
了代码版本管理的版本号不段攀升。
实际操作:
在Linux下尤其是CentOS这样的免费系统上有Yum这样的包管理工具来安DNS服务器,但是我在实践中发现其并不理想,可能是打出的Rpm包多少有些
不太让人满意,我试过用直接运行:yum install bind bind-utils bind-libs bind-chroot caching-nameserver,但后来在配置DNS时出现这样那样的问题.
找不到配置文件?(loading from master file 225.168.192.in-add.arpa failed: file not found)我X,什么权限问题都试了,但就是搞不定,于是否,
改用源码安装,这样来得更保险此些,操控性也强很多,有人问我,你的人生由谁来操盘:我操!
我的上手安装和配置如下:
一:开始安装DNS服务器Bind:
下载 bind http://www.isc.org,解压bind-9.9.1-P1.tar.gz。
tar -zxvf bind-9.9.1-P1.tar.gz
进入 bind-9.9.1-P1.tar.gz文件夹
cd bind-9.9.1-P1
创建安装目录,我是安装在 /usr/local/named
mkdir /usr/local/named
编译,指定安装目录,指定man目录,开启多线程支持(测试环境也就没有必要搞多线程了,要整看帮助。)
./configure --prefix=/usr/local/named
Make 大约需要几分钟,只要不报错就继续下去。
make
Make install 安装
make install
没有报错,就表示安装成功了。
创建以下目录以备用
mkdir /usr/local/named/namedb
二:开始配置bind
创建 rndc.conf文件,用bind自带程序生成
cd /usr/local/named/
sbin/rndc-confgen > etc/rndc.conf //一直死在这儿了,只得强制终止。
查原因,在网上搜索:linux安装dns,rndc-confgen没反应,哈,有一篇文章说到点上了,
Url:http://www.nginxs.com/linux/43.html,他说是,摘录如下:
在官方网站上看到这么一条信息
You must use the keyboard to create entropy, since your system is lacking
/dev/random (or equivalent)
start typing:
rndc-confgen: generate key: out of entropy
大概意思就是服务器上没有random产生器,这种情况下我们就手动伪造一个文件代替/dev/random的功能
###新建一个 random 文件随即输入一串数字“记得要长~~
shell $> vim random
asdkfjalsjdflajsldfjlasjdflajsldfjalsjdflajslfjalsjflasjfl
###查看 rndc-confgen 帮助
shell $> ../sbin/rndc-confgen –help
rndc-confgen: invalid argument –
Usage:
rndc-confgen [-a] [-b bits] [-c keyfile] [-k keyname] [-p port] [-r randomfile] [-s addr] [-t chrootdir] [-u user]
-a: generate just the key clause and write it to keyfile (/usr/local/named/etc/rndc.key)
-b bits: from 1 through 512, default 128; total length of the secret
-c keyfile: specify an alternate key file (requires -a)
-k keyname: the name as it will be used in named.conf and rndc.conf
-p port: the port named will listen on and rndc will connect to
-r randomfile: a file containing random data
-s addr: the address to which rndc should connect
-t chrootdir: write a keyfile in chrootdir as well (requires -a)
-u user: set the keyfile owner to “user” (requires -a)
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- shell $> ../sbin/rndc-confgen -r random >
shell $> ../sbin/rndc-confgen -r random > rndc.key
,上面这一句是核心,自己整个Random文件是桥梁。
tail -10 rndc.key | head -9 | sed 's/# //g' > named.conf
把这个named.conf放在etc的文件夹子下:/usr/local/named/etc/named.conf。
ok 问题解决了,接下来我们配置 我们的 域名服务器吧。
三:配置篇
编辑named.conf
# vi /usr/local/named/etc/named.conf
写入以下内容:我的Ip:192.168.225.128 ,注意:225.168.192.in-add.arpa是Ip的反解,刚好倒过来。
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- key "rndc-key" {
- algorithm hmac-md5;
- TQ==";
- };
- controls {
- inet 127.0.0.1 port 953
- allow { 127.0.0.1; } keys { "rndc-key"; };
- };
- options {
- Directory "/usr/local/named";
- Pid-file "named.pid";
- Allow-query { any ;};
- Dump-file "/usr/local/named/data/cache_dump.db";
- Statistics-file "/usr/local/named/data/named_stats.txt";
- };
- Zone "localhost" in {
- Type master;
- File "localhost.zone";
- };
- Zone "0.0.127.in-addr.arpa" in {
- Type master;
- File "localhost.rev";
- };
- zone "51test.com" {
- type master;
- file "51test.com.zone";
- };zone "225.168.192.in-add.arpa" IN {
- type master;
- file "225.168.192.in-add.arpa";
- };
key "rndc-key" {
algorithm hmac-md5;
secret "SnK8Ph1zCAnnykZ07qt+TQ==";
};
controls {
inet 127.0.0.1 port 953
allow { 127.0.0.1; } keys { "rndc-key"; };
};
options {
Directory "/usr/local/named";
Pid-file "named.pid";
Allow-query { any ;};
Dump-file "/usr/local/named/data/cache_dump.db";
Statistics-file "/usr/local/named/data/named_stats.txt";
};
Zone "localhost" in {
Type master;
File "localhost.zone";
};
Zone "0.0.127.in-addr.arpa" in {
Type master;
File "localhost.rev";
};
zone "51test.com" {
type master;
file "51test.com.zone";
};zone "225.168.192.in-add.arpa" IN {
type master;
file "225.168.192.in-add.arpa";
};
退出,保存。
创建并编辑 localhost.zone 文件
vi /usr/local/named/localhost.zone
写入以下内容:
- $TTL 3600
- $ORIGIN 127.0.0.1.
- @ 1D IN SOA localhost. root.localhost. (
- 42 ;
- 3H ;
- 15M ;
- 1W ;
- 3600);
- 1D IN NS 127.0.0.1
- 1D IN A 127.0.0.1
$TTL 3600
$ORIGIN 127.0.0.1.
@ 1D IN SOA localhost. root.localhost. (
42 ;
3H ;
15M ;
1W ;
3600);
1D IN NS 127.0.0.1
1D IN A 127.0.0.1
创建并编辑 localhost.rev 文件
# vi /usr/local/named/localhost.rev
- $TTL 3600
- @ IN SOA localhost. root.localhost. (
- 1; serial
- 3600; refresh every hour
- 900; retry every 15 minutes
- 3600000; expire 1000 hours
- 3600); minimun 1 hour
- IN NS localhost.
- 1 IN PTR localhost.
$TTL 3600
@ IN SOA localhost. root.localhost. (
1; serial
3600; refresh every hour
900; retry every 15 minutes
3600000; expire 1000 hours
3600); minimun 1 hour
IN NS localhost.
1 IN PTR localhost.
因前面在,51test.com这个是在其他网页上抄过来的简单示例,于是也就顺便把文件也贴上:
vi /usr/local/named/51test.com.zone
- $TTL 86400
- @ IN SOA www.51test.com. root.localhost (
- 2 ; serial
- 28800 ; refresh
- 7200 ; retry
- 604800 ; expire
- 86400 ; ttl
- )
- IN NS www.51test.com.
- www IN A 192.168.225.128
- admin IN A 192.168.225.128
$TTL 86400
@ IN SOA www.51test.com. root.localhost (
2 ; serial
28800 ; refresh
7200 ; retry
604800 ; expire
86400 ; ttl
)
IN NS www.51test.com.
www IN A 192.168.225.128
admin IN A 192.168.225.128
再不是51test.com的反解配置文件:
vi /usr/local/named/225.168.192.in-add.arpa
- $TTL 86400
- @ IN SOA 51test.com. root.51test.com. (
- 1997022700 ; Serial
- 28800 ; Refresh
- 14400 ; Retry
- 3600000 ; Expire
- 86400 ) ; Minimum
- @ IN NS 51test.com.
- 128 IN PTR www.51test.com.
- 128 IN PTR admin.51test.com.
$TTL 86400
@ IN SOA 51test.com. root.51test.com. (
1997022700 ; Serial
28800 ; Refresh
14400 ; Retry
3600000 ; Expire
86400 ) ; Minimum
@ IN NS 51test.com.
128 IN PTR www.51test.com.
128 IN PTR admin.51test.com.
配置注意事项:
配置文件中的 "@" 符号前不能有任何空白字符
配置文件中的 "IN" 字符前必须有空格或TAB
到此,配置大功告成。
四:
下载一个named.root 到/usr/local/named/下
ftp://ftp.rs.internic.net/domain/named.root
Ftp失效,从这儿下载:
http://www.smth.edu.cn/bbsgcon.php?board=FreeBSD&num=1209 特别注意:bind的配置文档是区分大小写的,因现在那个FTP好像下载不了,于是我也贴下面。
vi /usr/local/named/named.ca
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- more named.root
- ; This file holds the information on root name servers needed to
- ; initialize cache of Internet domain name servers
- ; (e.g. reference this file in the "cache . <file>"
- ; configuration file of BIND domain name servers).
- ;
- ; This file is made available by InterNIC
- ; under anonymous FTP as
- ; file /domain/named.root
- ; on server FTP.INTERNIC.NET
- ;
- ; last update: Nov 5, 2002
- ; related version of root zone: 2002110501
- ;
- ;
- ; formerly NS.INTERNIC.NET
- ;
- . 3600000 IN NS A.ROOT-SERVERS.NET.
- A.ROOT-SERVERS.NET. 3600000 A 198.41.0.4
- ;
- ; formerly NS1.ISI.EDU
- ;
- . 3600000 NS B.ROOT-SERVERS.NET.
- B.ROOT-SERVERS.NET. 3600000 A 128.9.0.107
- ;
- ; formerly C.PSI.NET
- ;
- . 3600000 NS C.ROOT-SERVERS.NET.
- C.ROOT-SERVERS.NET. 3600000 A 192.33.4.12
- ;
- ; formerly TERP.UMD.EDU
- ;
- . 3600000 NS D.ROOT-SERVERS.NET.
- D.ROOT-SERVERS.NET. 3600000 A 128.8.10.90
- ;
- ; formerly NS.NASA.GOV
- ;
- . 3600000 NS E.ROOT-SERVERS.NET.
- E.ROOT-SERVERS.NET. 3600000 A 192.203.230.10
- ;
- ; formerly NS.ISC.ORG
- ;
- . 3600000 NS F.ROOT-SERVERS.NET.
- F.ROOT-SERVERS.NET. 3600000 A 192.5.5.241
- ;
- ; formerly NS.NIC.DDN.MIL
- ;
- . 3600000 NS G.ROOT-SERVERS.NET.
- G.ROOT-SERVERS.NET. 3600000 A 192.112.36.4
- ;
- ; formerly AOS.ARL.ARMY.MIL
- ;
- . 3600000 NS H.ROOT-SERVERS.NET.
- H.ROOT-SERVERS.NET. 3600000 A 128.63.2.53
- ;
- ; formerly NIC.NORDU.NET
- ;
- . 3600000 NS I.ROOT-SERVERS.NET.
- I.ROOT-SERVERS.NET. 3600000 A 192.36.148.17
- ;
- ; operated by VeriSign, Inc.
- ;
- . 3600000 NS J.ROOT-SERVERS.NET.
- J.ROOT-SERVERS.NET. 3600000 A 192.58.128.30
- ;
- ; housed in LINX, operated by RIPE NCC
- ;
- . 3600000 NS K.ROOT-SERVERS.NET.
- K.ROOT-SERVERS.NET. 3600000 A 193.0.14.129
- ;
- ; operated by IANA
- ;
- . 3600000 NS L.ROOT-SERVERS.NET.
- L.ROOT-SERVERS.NET. 3600000 A 198.32.64.12
- ;
- ; housed in Japan, operated by WIDE
- ;
- . 3600000 NS M.ROOT-SERVERS.NET.
- M.ROOT-SERVERS.NET. 3600000 A 202.12.27.33
- ; End of File
more named.root
; This file holds the information on root name servers needed to
; initialize cache of Internet domain name servers
; (e.g. reference this file in the "cache . <file>"
; configuration file of BIND domain name servers).
;
; This file is made available by InterNIC
; under anonymous FTP as
; file /domain/named.root
; on server FTP.INTERNIC.NET
;
; last update: Nov 5, 2002
; related version of root zone: 2002110501
;
;
; formerly NS.INTERNIC.NET
;
. 3600000 IN NS A.ROOT-SERVERS.NET.
A.ROOT-SERVERS.NET. 3600000 A 198.41.0.4
;
; formerly NS1.ISI.EDU
;
. 3600000 NS B.ROOT-SERVERS.NET.
B.ROOT-SERVERS.NET. 3600000 A 128.9.0.107
;
; formerly C.PSI.NET
;
. 3600000 NS C.ROOT-SERVERS.NET.
C.ROOT-SERVERS.NET. 3600000 A 192.33.4.12
;
; formerly TERP.UMD.EDU
;
. 3600000 NS D.ROOT-SERVERS.NET.
D.ROOT-SERVERS.NET. 3600000 A 128.8.10.90
;
; formerly NS.NASA.GOV
;
. 3600000 NS E.ROOT-SERVERS.NET.
E.ROOT-SERVERS.NET. 3600000 A 192.203.230.10
;
; formerly NS.ISC.ORG
;
. 3600000 NS F.ROOT-SERVERS.NET.
F.ROOT-SERVERS.NET. 3600000 A 192.5.5.241
;
; formerly NS.NIC.DDN.MIL
;
. 3600000 NS G.ROOT-SERVERS.NET.
G.ROOT-SERVERS.NET. 3600000 A 192.112.36.4
;
; formerly AOS.ARL.ARMY.MIL
;
. 3600000 NS H.ROOT-SERVERS.NET.
H.ROOT-SERVERS.NET. 3600000 A 128.63.2.53
;
; formerly NIC.NORDU.NET
;
. 3600000 NS I.ROOT-SERVERS.NET.
I.ROOT-SERVERS.NET. 3600000 A 192.36.148.17
;
; operated by VeriSign, Inc.
;
. 3600000 NS J.ROOT-SERVERS.NET.
J.ROOT-SERVERS.NET. 3600000 A 192.58.128.30
;
; housed in LINX, operated by RIPE NCC
;
. 3600000 NS K.ROOT-SERVERS.NET.
K.ROOT-SERVERS.NET. 3600000 A 193.0.14.129
;
; operated by IANA
;
. 3600000 NS L.ROOT-SERVERS.NET.
L.ROOT-SERVERS.NET. 3600000 A 198.32.64.12
;
; housed in Japan, operated by WIDE
;
. 3600000 NS M.ROOT-SERVERS.NET.
M.ROOT-SERVERS.NET. 3600000 A 202.12.27.33
; End of File
五:运行Bind程序,如下方式加载配置文件启动,加上调试信息参数:
/usr/local/named/sbin/named -gc /usr/local/named/etc/named.conf
如果运行结果最后一行显示Running
表明安装并启动成功。
最后需要注意的内容是不要忘了是否真正的开启服务器端口(以下是named.conf文件中端口的设置语句,可以看到端口号是 53:telnet x.x.x.x 53)
当然也可以用:nmap localhost ,没有yum安装,这种小工具问题不大用yum来做。
yum install nmap
Total download size: 2.3 M
Installed size: 7.5 M
Is this ok [y/N]: y
Downloading Packages:
root@192.168.225.128:/usr/local/named# nmap localhost
Starting Nmap 5.21 ( http://nmap.org ) at 2012-06-18 03:09 CST
Nmap scan report for localhost (127.0.0.1)
Host is up (0.000033s latency).
Hostname localhost resolves to 2 IPs. Only scanned 127.0.0.1
Not shown: 994 closed ports
PORT STATE SERVICE
22/tcp open ssh
53/tcp open domain
80/tcp open http
111/tcp open rpcbind
3306/tcp open mysql
9000/tcp open cslistener
端口号是 53就是DNS Bind的端口。
六:停止及启动:
root@192.168.225.128:/usr/local/named# ps aux|grep name
root 19024 0.0 1.2 10624 6216 pts/0 T 03:00 0:00 /usr/local/named/sbin/named -gc /usr/local/named/etc/named.conf
root@192.168.225.128:/usr/local/named# kill -9 19024
root@192.168.225.128:/usr/local/named# ps aux|grep name
[2]+ 已杀死 /usr/local/named/sbin/named -gc /usr/local/named/etc/named.conf
七:本机测试,外部机器测试是否dns生效:
vi /etc/resolv.conf
加上,去掉注释其他Dns的Ip值:
nameserver 192.168.225.128
启动Dns后,清楚Bind服务器上的Dns缓存:
root@192.168.225.128:/usr/local/named# ./sbin/rndc flush
root@192.168.225.128:/usr/local/named# ping www.51test.com
PING www.51test.com (192.168.225.128) 56(84) bytes of data.
64 bytes from 192.168.225.128: icmp_seq=1 ttl=64 time=0.025 ms
64 bytes from 192.168.225.128: icmp_seq=2 ttl=64 time=0.058 ms
八:将服务设置为开机自启,把named 添加到启动项,随操作系统一起启动即可:
root@192.168.225.128:/usr/local/named# chkconfig --list named
named 0:关闭 1:关闭 2:关闭 3:关闭 4:关闭 5:关闭 6:关闭
root@192.168.225.128:/usr/local/named# chkconfig --level 345 named on
root@192.168.225.128:/usr/local/named# chkconfig --list named
named 0:关闭 1:关闭 2:关闭 3:启用 4:启用 5:启用 6:关闭
但是,我们现在是源码的安装,So,得这样子喔。
修改来自Apache里的启动shell(参看一下自启动的标准),也可以不用修改,直接如下也成,内容如下:
#!/bin/bash
#chkconfig:345 61 61
#description: dns start shell
echo "Starting DNS daemon..."
pkill -9 named
ulimit -SHn 51200
nohup /usr/local/named/sbin/named -gc /usr/local/named/etc/named.conf > /dev/null 2>&1 &
1)保存为/etc/init.d/dns
脚本执行权限添加:
2)chmod -R a+x /etc/init.d/dns //env: /etc/init.d/dns: 权限不够 ,必须给加上。
3)把脚本拷贝至/etc/init.d/目录下,执行命令:
ln -s /etc/init.d/dns /etc/rc.d/rc3.d/S61dns
ln -s /etc/init.d/dns /etc/rc.d/rc4.d/S61dns
ln -s /etc/init.d/dns /etc/rc.d/rc5.d/S61dns
再执行:
chkconfig --add dns //解释:相当于Windows下的自动启动服务,特别要注意:chkconfig –add dns的时候,出现dns服务不支持chkconfig。
如果想让服务支持chkconfig,必须定义服务的启动级,启动优先级,关闭优先级,还有描述,如上,必须得加上描述等。
chkconfig --levels dns345 on //也成
开机启动设置完毕:
service dns start
-----------------------------------------------
;特别要注意:chkconfig –add dns的时候,出现dns服务不支持chkconfig。
chkconfig --add dns
service dns start
Starting DNS daemon...
ps aux|grep named
root 19441 0.0 1.1 10364 5872 pts/2 S 04:29 0:00 /usr/local/named/sbin/named -gc /usr/local/named/etc/named.conf
下次一开机也就会运行这个脚本,以启动自己定义的Dns服务器。
- reboot
reboot
启动后,查看是否自己就启动了呢?如下:
- root@192.168.225.128:~# ps aux|grep named
- root 1272 0.0 1.1 10232 5680 ? S 05:20 0:00 /usr/local/named/sbin/named -gc /usr/local/named/etc/named.conf
- root 2039 0.0 0.1 5956 756 pts/0 S+ 05:22 0:00 grep named
root@192.168.225.128:~# ps aux|grep named
root 1272 0.0 1.1 10232 5680 ? S 05:20 0:00 /usr/local/named/sbin/named -gc /usr/local/named/etc/named.conf
root 2039 0.0 0.1 5956 756 pts/0 S+ 05:22 0:00 grep named
果然,又启动起来了,大功告成,整完收工。
Dns服务器从安装到调试配置并测试完成,Eof。Write and Opt By:jackxiang 2012/06/17 20:30:00
后来,我自己配置了一个新的域名:naimanqi.com.cn ,我的Linux机器IP是:192.168.1.105
修改配置文件:
1)共用如下:
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- options {
- "/usr/local/named";
- "named.pid";
- Allow-query { any ;};
- "/usr/local/named/data/cache_dump.db";
- "/usr/local/named/data/named_stats.txt";
- };
- 2)添加如下两个正向解析和反向解析的配置文件:
options {
Directory "/usr/local/named";
Pid-file "named.pid";
Allow-query { any ;};
Dump-file "/usr/local/named/data/cache_dump.db";
Statistics-file "/usr/local/named/data/named_stats.txt";
};
2)添加如下两个正向解析和反向解析的配置文件:
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- vi /usr/local/named/etc/named.conf
- zone "naimanqi.com.cn"
- type master;
- "naimanqi.com.cn.zone";
- };zone "1.168.192.in-add.arpa"
- type master;
- "1.168.192.in-add.arpa";
- };
vi /usr/local/named/etc/named.conf
zone "naimanqi.com.cn" {
type master;
file "naimanqi.com.cn.zone";
};zone "1.168.192.in-add.arpa" IN {
type master;
file "1.168.192.in-add.arpa";
};
3)反向解析文件:
view plain copy to clipboard print ?
- vi /usr/local/named/1.168.192.in-add.arpa
- $TTL
- @ IN SOA naimanqi.com.cn. root.naimanqi.com.cn. (
- 1997022700 ; Serial
- 28800 ; Refresh
- 14400 ; Retry
- 3600000 ; Expire
- 86400 ) ; Minimum
- @ IN NS naimanqi.com.cn.
- 128 IN PTR www.naimanqi.com.cn.
- 128 IN PTR admin.naimanqi.com.cn.
vi /usr/local/named/1.168.192.in-add.arpa
$TTL 86400
@ IN SOA naimanqi.com.cn. root.naimanqi.com.cn. (
1997022700 ; Serial
28800 ; Refresh
14400 ; Retry
3600000 ; Expire
86400 ) ; Minimum
@ IN NS naimanqi.com.cn.
128 IN PTR www.naimanqi.com.cn.
128 IN PTR admin.naimanqi.com.cn.
4)正向解析的文件:
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- vi /usr/local/named/naimanqi.com.cn.zone
- $TTL
- @ IN SOA naimanqi.com.cn. root.localhost (
- 2 ; serial
- 28800 ; refresh
- 7200 ; retry
- 604800 ; expire
- 86400 ; ttl
- )
- IN NS naimanqi.com.com.
- IN A 192.168.1.105
- www IN A 192.168.1.105
- admin IN A 192.168.1.105
vi /usr/local/named/naimanqi.com.cn.zone
$TTL 86400
@ IN SOA naimanqi.com.cn. root.localhost (
2 ; serial
28800 ; refresh
7200 ; retry
604800 ; expire
86400 ; ttl
)
IN NS naimanqi.com.com.
IN A 192.168.1.105
www IN A 192.168.1.105
admin IN A 192.168.1.105
注意这一行: IN A 192.168.1.105
这个目的是把浏览器访问:naimanqi.com.cn这个域名也给解析到IP: 192.168.1.105上来,跟在后面的www IN A 192.168.1.105 这个是对www解析的,其实它是一个二级域名和admin 这种二级域名是一个意思:admin IN A 192.168.1.105 。。。EOF。
最后,可以这样玩这个DNS,这个CentOs6.3的Linux 不是建立在这个NAT下的嘛,后修改为Bridge(桥连),这样后,反正是在一个网段内(路由器下),把自己外网的这台Windows下的机器的DNS由192.168.1.1修改为:192.168.1.105,这样既可以调试刚才配置的内部DNS进行调试,也可 以访问外网,为什么呢?是因为:
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- C:\Documents and
- DNS request timed out.
- timeout was 2 seconds.
- *** Can't find server name for
- *** Default servers are not available
- Server: UnKnown
- Address: 192.168.1.105
- Non-authoritative answer:
- Name: justwinit.cn
- Address: 72.46.128.86
C:\Documents and Settings\Administrator>nslookup justwinit.cn
DNS request timed out.
timeout was 2 seconds.
*** Can't find server name for address 192.168.1.105: Timed out
*** Default servers are not available
Server: UnKnown
Address: 192.168.1.105
Non-authoritative answer:
Name: justwinit.cn
Address: 72.46.128.86
是因,内部DNS没有找到那个地址后,它自动转给上一级DNS去了,后得到那个外部网站的IP地址了。但修改为NAT后,好像启动Centos里的DNS后,再在Windows上修改IP为桥连后的IP好像DNS解析不了,在Linux自己修改 /etc/resolve.conf后是可以的,所以,建议用桥连方式来开发,少用NAT方式,这样可以在一个路由器下的电脑都可以配置上这个Dns来访问该网站和开发网部(samba),很是方便,而DNS设置后,如果没有这个网站在内网,它便会访问外网,这种机制也是很好的