Static routing assignment of network reachable and telent connections

1. Subnet partition

There are requirements R1-R5 For LAN 192.168.1.0/24, Plus the loopback needs and needs 6 Net segment , That is, borrow the network bit 3 position .
R5 To R6 The network segment of is private ,R6 Represents all other network segments, which is replaced by loopback .
Divide 6 Network segment reasons ：
        R1-R5 For a LAN , Divide all backbone roads into one network segment , The loopback of each server is considered as a network segment , Then divide the divided network segment .

2.IP Address command example

[R1]interface GigabitEthernet 0/0/1
[R1-GigabitEthernet0/0/1]ip address 192.168.1.1 255.255.255.252

3. Configuration loopback interface command example

[r1]interface LoopBack 0
[r1-LoopBack0]ip address 192.168.1.1  30

4.IP Address assignment , And configure the loopback interface

R1

R2

R4

R5

R6

5. to R3 Conduct DHCP Service configuration , Simultaneous configuration IP Address

r3 Of DHCP Service configuration

[r3]dhcp enable  ---  Turn on DHCP The server 

[r3]ip pool a
Info: It's successful to create an IP address pool.
[r3-ip-pool-a]
---  establish IP Address pool 

[r3-ip-pool-a]network 192.168.1.97 mask  27
[r3-ip-pool-a]gateway-list 192.168.1.97
[r3-ip-pool-a]dns-list 114.114.114.114 8.8.8.8
---  To configure IP Address pool 

 Enter the interface view 
[r3-GigabitEthernet0/0/2]dhcp select global 
 Select global configuration 

Be careful ：PC Choose dhcp Get dynamic ip Options for pass Ipconfig obtain dhcp Address

6.R1-R5 You can visit R6 The loopback of =》 Network wide accessibility 【 Consider at the same time R4-R5 Priority routing 】

To facilitate matching, use the default route to complete , For the required route, it is better to statically configure individual routes
Default route ：

[r4]ip route-static 0.0.0.0 0.0.0.0 192.168.1.18 ---  Configure the default route 

Empty interface routing

[r4]ip route-static 192.168.1.128 28 NULL 0

Priority modification 【 The default priority of routing is 60, The higher the priority, the lower 】

[r4]ip route-static 0.0.0.0 0.0.0.0 192.168.1.22 preference 61    Floating static routing 

Detailed configuration ：

1.R1

2.R2

3.R3

4.R4

5.R5

7. send r6 telent r5 Actual connection r1

r1 Turn on aaa

[R1-aaa]local-user panxi privilege level 15 password  cipher 123456
[R1-aaa]local-user panxi service-type telnet
[R1-aaa]q
[R1-ui-vty0]authentication-mode aaa

R5 mapping

[r5]int g 0/0/1
[r5-GigabitEthernet0/0/1]nat server protocol tcp global current-interface 23 inside 192.168.1.1 23

R6 Connect

<r6>telnet 56.1.1.1