NAT负载均衡

拓扑图：

配置参数：

R2：

ip nat pool 1 10.1.2.2 10.1.2.3 netmask 255.255.255.0 type rotary //内网服务器地址池

ip nat inside destination list 1 pool 1 //目标NAT绑定

access-list 1 permit 192.168.1.2 //路由器外网接口IP地址

interface FastEthernet1/0

ip nat inside //内网接口

interface FastEthernet2/0

ip nat outside //外网接口

计算机配置情况：

电脑上有3块网卡：

本地连接-----桥接====>C3

VMware Network Adapter-----桥接====>C1

VirtualBox Host-Only Network-----桥接====>C2

FTP服务器：

C1:

C2:

C3：

以太网适配器本地连接:

连接特定的 DNS 后缀 . . . . . . . : domain

本地链接 IPv6 地址. . . . . . . . : fe80::3836:3343:add:768f%13

IPv4 地址 . . . . . . . . . . . . : 192.168.1.100

子网掩码 . . . . . . . . . . . . : 255.255.255.0

默认网关. . . . . . . . . . . . . : 192.168.1.1

以太网适配器 VirtualBox Host-Only Network:

连接特定的 DNS 后缀 . . . . . . . :

本地链接 IPv6 地址. . . . . . . . : fe80::b5f2:e1a1:e34e:5847%23

IPv4 地址 . . . . . . . . . . . . : 10.1.2.5 ---------->对应虚拟机的C2

子网掩码 . . . . . . . . . . . . : 255.255.255.0

默认网关. . . . . . . . . . . . . : 10.1.2.1

以太网适配器 VMware Network Adapter VMnet1:

连接特定的 DNS 后缀 . . . . . . . :

本地链接 IPv6 地址. . . . . . . . : fe80::896:5b4c:a949:d0e3%30

IPv4 地址 . . . . . . . . . . . . : 10.1.2.4 ---------->对应虚拟机的C1

子网掩码 . . . . . . . . . . . . : 255.255.255.0

默认网关. . . . . . . . . . . . . : 10.1.2.1

测试：

在C3（真机）上登陆FTP：可以看到登陆到了10.1.2.2的FTP服务器上面！

C:\Users\lenovo>ftp 192.168.1.2

连接到 192.168.1.2。

220 Microsoft FTP Service

用户(192.168.1.2:(none)): administrator

331 Password required for administrator.

密码:

230 User administrator logged in.

ftp> dir

200 PORT command successful.

150 Opening ASCII mode data connection for /bin/ls.

02-08-13 02:33PM 4 ftp1.txt

226 Transfer complete.

ftp: 收到 49 字节，用时 0.00秒 24.50千字节/秒。

ftp>

r2#sh ip na tr

Pro Inside global Inside local Outside local Outside global

tcp 192.168.1.2:21 10.1.2.2:21 192.168.1.100:54476 192.168.1.100:54476

r2#

在C3（真机）上再次登陆FTP：可以看到自动转换到了10.1.2.3的FTP服务器上面！

C:\Users\lenovo>ftp 192.168.1.2

连接到 192.168.1.2。

220 Microsoft FTP Service

用户(192.168.1.2:(none)): administrator

331 Password required for administrator.

密码:

230 User administrator logged in.

ftp> dir

200 PORT command successful.

150 Opening ASCII mode data connection for /bin/ls.

02-08-13 01:09PM 24 ftp2.txt

226 Transfer complete.

ftp: 收到 49 字节，用时 0.00秒 49000.00千字节/秒。

ftp>

r2#sh ip na tr

Pro Inside global Inside local Outside local Outside global

tcp 192.168.1.2:21 10.1.2.2:21 192.168.1.100:54476 192.168.1.100:54476

tcp 192.168.1.2:20 10.1.2.3:20 192.168.1.100:54484 192.168.1.100:54484

tcp 192.168.1.2:21 10.1.2.3:21 192.168.1.100:54483 192.168.1.100:54483

r2#

可以看到TPC负载均衡配置成功！

问题：

只有将FTP服务器的外网IP配置成路由器的外网接口才可以测试成功！配置成其它的IP就测试不成功。

下面是各设备的配置文件：

r2#sh run

Building configuration...

Current configuration : 1184 bytes

version 12.3

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption

hostname r2

boot-start-marker

boot-end-marker

memory-size iomem 5

no aaa new-model

ip subnet-zero

ip cef

ip ips po max-events 100

no ftp-server write-enable

interface Serial0/0

no ip address

ip virtual-reassembly

serial restart-delay 0

interface Serial0/1

no ip address

shutdown

serial restart-delay 0

interface Serial0/2

no ip address

shutdown

serial restart-delay 0

interface Serial0/3

no ip address

shutdown

serial restart-delay 0

interface FastEthernet1/0

ip address 10.1.2.1 255.255.255.0

ip nat inside

ip virtual-reassembly

duplex auto

speed auto

interface FastEthernet2/0

ip address 192.168.1.2 255.255.255.0

ip nat outside

ip virtual-reassembly

duplex auto

speed auto

ip http server

no ip http secure-server

ip classless

ip nat pool 1 10.1.2.2 10.1.2.3 netmask 255.255.255.0 type rotary

ip nat inside destination list 1 pool 1

access-list 1 permit 192.168.1.0 0.0.0.255

control-plane

line con 0

line aux 0

line vty 0 4

login

end

r2#

r2# sh ip int b

Interface IP-Address OK? Method Status Protocol

Serial0/0 unassigned YES manual up down

Serial0/1 unassigned YES NVRAM administratively down down

Serial0/2 unassigned YES NVRAM administratively down down

Serial0/3 unassigned YES NVRAM administratively down down

FastEthernet1/0 10.1.2.1 YES NVRAM up up

FastEthernet2/0 192.168.1.2 YES manual up up

r2#

r3#sh run

Building configuration...

Current configuration : 1342 bytes

version 12.3

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption

hostname r3

boot-start-marker

boot-end-marker

memory-size iomem 5

no aaa new-model

ip subnet-zero

ip cef

ip ips po max-events 100

no ftp-server write-enable

interface FastEthernet0/0

no ip address

interface FastEthernet0/1

no ip address

interface FastEthernet0/2

no ip address

interface FastEthernet0/3

no ip address

shutdown

interface FastEthernet0/4

no ip address

shutdown

interface FastEthernet0/5

no ip address

shutdown

interface FastEthernet0/6

no ip address

shutdown

interface FastEthernet0/7

no ip address

shutdown

interface FastEthernet0/8

no ip address

shutdown

interface FastEthernet0/9

no ip address

shutdown

interface FastEthernet0/10

no ip address

shutdown

interface FastEthernet0/11

no ip address

shutdown

interface FastEthernet0/12

no ip address

shutdown

interface FastEthernet0/13

no ip address

shutdown

interface FastEthernet0/14

no ip address

shutdown

interface FastEthernet0/15

no ip address

shutdown

interface Vlan1

no ip address

shutdown

ip http server

no ip http secure-server

ip classless

control-plane

line con 0

line aux 0

line vty 0 4

end

r3#

r3# sh ip int b

Interface IP-Address OK? Method Status Protocol

FastEthernet0/0 unassigned YES unset up up

FastEthernet0/1 unassigned YES unset up up

FastEthernet0/2 unassigned YES unset up up

FastEthernet0/3 unassigned YES unset administratively down down

FastEthernet0/4 unassigned YES unset administratively down down

FastEthernet0/5 unassigned YES unset administratively down down

FastEthernet0/6 unassigned YES unset administratively down down

FastEthernet0/7 unassigned YES unset administratively down down

FastEthernet0/8 unassigned YES unset administratively down down

FastEthernet0/9 unassigned YES unset administratively down down

FastEthernet0/10 unassigned YES unset administratively down down

FastEthernet0/11 unassigned YES unset administratively down down

FastEthernet0/12 unassigned YES unset administratively down down

FastEthernet0/13 unassigned YES unset administratively down down

FastEthernet0/14 unassigned YES unset administratively down down

FastEthernet0/15 unassigned YES unset administratively down down

Vlan1 unassigned YES unset administratively down down

r3#

转载于:https://blog.51cto.com/4708948/1133153

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