One 、 Build topology

Two 、 planning IP

1、R1 Of ip

Interface                         IP Address/Mask      Physical   Protocol  
GigabitEthernet0/0/0              192.168.1.1/24       up         up        
GigabitEthernet0/0/1              12.1.1.1/24          up         up        
GigabitEthernet0/0/2              unassigned           down       down      
NULL0                             unassigned           up         up(s)     
<R1>

2、R2 Of ip

Interface                         IP Address/Mask      Physical   Protocol  
GigabitEthernet0/0/0              12.1.1.2/24          up         up        
GigabitEthernet0/0/1              1.1.1.1/24           up         up        
GigabitEthernet0/0/2              unassigned           down       down      
NULL0                             unassigned           up         up(s)     
[R2-GigabitEthernet0/0/1]

3、pc1 Of ip

4、http1 Of ip

5、http2 Of ip

6、PC2 Of ip

7、Client1 Of ip

8、DNS Of ip

3、 ... and 、 The first two requirements have met the meaning of the question

1、 test PC1 PING PC2

2、 test PC1 PING PC2, Can communicate

Four 、R1 Only one public ip

[R1]ip route-static 0.0.0.0 0 12.1.1.2
[R1]acl 2000
[R1-acl-basic-2000]rule permit source 192.168.1.0 0.255.255.255
[R1-acl-basic-2000]int g0/0/1
[R1-GigabitEthernet0/0/1]nat outbound 2000

5、 ... and 、CLIENT Can pass http Visit two server

6、 ... and 、client Visiting another server By domain name

[R1]int g0/0/1
[R1-GigabitEthernet0/0/1]nat server protocol tcp global current-interface 80 inside 192.168.1.10 80
Warning:The port 80 is well-known port. If you continue it may cause function failure.
Are you sure to continue?[Y/N]:y
[R1-GigabitEthernet0/0/1]nat server protocol tcp global current-interface 9999 inside 192.168.1.20 80