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内网域名访问内网服务器

部门ftp服务器和远程服务器内网域名无法访问问题困扰我好久，钻研了几天，终于明白了一些，和大家做一个分享，原帖子在这里，表示感谢

一. 网络需求

现状：内网中两台服务器，对外提供ftp和samba服务，网关路由器公网接口上已下发nat server 配置，DNS服务器位于公网，将两台服务器对应的域名映射到公网出口地址上，公网用户已经可以正常通过域名访问服务器
改进：内网用户可以使用域名或是公网IP访问内部服务器
涉及路由器：TL-WVR1300G  AC1300双频无线企业VPN路由器

二. 待选方案

方案一：DNS-mapping 方案：
    在路由器上配置DNS map功能，建立域名-公网地址-公网端口号-服务协议的匹配表项。当内网用户发出的DNS解析请求得到的DNS Server响应到达配置了NAT server 的公网出接口时，接口上查找到DNS map表项后会将内网服务器的地址替换解析到的公网地址，主机就可以使用内网地址直接访问服务器。

方案二：利用NAT 和NAT Server 下发在内网网关接口上，使内网主机通过公网地址去访问服务器。
   在不使用DNS-mapping的情况下，主机用域名访问服务器意味着主机必须能使用公网地址去访问内网服务器。通过将NAT和NATServer 配置下发在内网网关接口上可以满足该应用（原先下发在公网接口上的nat server 配置是为了满足公网用户访问的，该部分配置不变）。

三. 配置步骤

方案一配置 
<H3C>system-view
[H3C]sysname Gateway
[Gateway]interface g0/1
[Gateway-GigabitEthernet0/1]ip address 202.38.1.1 24
[Gateway-GigabitEthernet0/1]nat server protocol tcp global 202.38.1.1 www inside 10.110.1.1 www
[Gateway-GigabitEthernet0/1]nat server protocol tcp global 202.38.1.1 ftp inside 10.110.1.2 ftp
[Gateway-GigabitEthernet0/1]quit
[Gateway]interface g0/0
[Gateway-GigabitEthernet0/0]ip address 10.110.1.10 24
[Gateway-GigabitEthernet0/0]quit
// 注意dns-map 配置中对应的地址是公网地址而不是服务器的内网地址
[Gateway] nat dns-map domain www.server.com protocol tcp ip 202.38.1.2 port www
[Gateway] nat dns-map domain ftp.server.com protocol tcp ip 202.38.1.2 port ftp

 方案二配置
<H3C>system-view
[H3C]sysname Gateway
[Gateway]acl number 3000
//编写acl 匹配来自内网网段目的地址为两台server的数据流
[Gateway-acl-adv-3000]rule permit ip source 10.110.1.0 0.0.0.255 destination 10.110.1.1 0
[Gateway-acl-adv-3000] rule permit ip source 10.110.1.0 0.0.0.255 destination 10.110.1.2 0
[Gateway]interface g0/0
[Gateway-GigabitEthernet0/0]ip address 10.110.1.10 24
//将nat及nat server 配置下发在内网网关口上
[Gateway-GigabitEthernet0/0]nat server protocol tcp global 202.38.1.1 www inside 10.110.1.1 www.luyouqiwang.com
[Gateway-GigabitEthernet0/0]nat server protocol tcp global 202.38.1.1 ftp inside 10.110.1.2 ftp
[Gateway-GigabitEthernet0/0]nat outbound 3000
[Gateway-GigabitEthernet0/0]quit      
//其它基础配置略

四. 配置关键点

1．注意dns-map的配置中的ip地址应该配置公网出接口地址。
Nat server 的相关配置应该下发在公网出接口上。
2．在方案二中，nat server 及 nat outbound的配置应当配置在内网网关接口上。并且注意acl 规则中的目的地址应匹配服务器主机地址。
3. 在方案二中，可以使用 nat static 方式为私网server地址和公网地址间建立1对1转换。 这一配置可以用来代替nat server 的相关配置。

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