CCNA NAT SIM Question 1
Question
A network associate is configuring a router for the CCNA Training company to provide internet access. The ISP has provided the company six public IP addresses of 198.18.184.105 198.18.184.110. The company has 14 hosts that need to access the internet simultaneously. The hosts in the CCNA Training company LAN have been assigned private space addresses in the range of 192.168.100.17 – 192.168.100.30.
The task is to complete the NAT configuration using all IP addresses assigned by the ISP to provide Internet access for the hosts in the Weaver LAN. Functionality can be tested by clicking on the host provided for testing.
Configuration information
router name – Weaver
inside global addresses – 198.18.184.105 198.18.184.110/29
inside local addresses – 192.168.100.17 – 192.168.100.30/28
number of inside hosts – 14
|
The following have already been configured on the router： - The basic router configuration - The appropriate interfaces have been configured for NAT inside and NAT outside - The appropriate static routes have also been configured (since the company will be a stub network, no routing protocol will be required.) - All passwords have been temporarily set to “cisco” |
Solution
Note: If you are not sure how NAT & PAT work, please read my Network Address Translation NAT Tutorial. You can download this sim to practice here: http://www.9tut.com/download/9tut.com_CCNA_NAT_sim_question.zip
The CCNA Training company has 14 hosts that need to access the internet simultaneously but we just have 6 public IP addresses from 198.18.184.105 to 198.18.184.110/29. Therefore we have to use NAT overload (or PAT)
Double click on the Weaver router to open it
Router>enable
Router#configure terminal
First you should change the router’s name to Weaver
Router(config)#hostname Weaver
Create a NAT pool of global addresses to be allocated with their netmask (/29 = 255.255.255.248). There were reports that the simulator in the real exam did not accept “prefix-length” keryword so you should use “netmask” keyword.
Weaver(config)#ip nat pool mypool 198.18.184.105 198.18.184.110 netmask 255.255.255.248
Create a standard access control list that permits the addresses that are to be translated
Weaver(config)#access-list 1 permit 192.168.100.16 0.0.0.15
Establish dynamic source translation, specifying the access list that was defined in the prior step
Weaver(config)#ip nat inside source list 1 pool mypool overload
This command translates all source addresses that pass access list 1, which means a source address from 192.168.100.17 to 192.168.100.30, into an address from the pool named mypool (the pool contains addresses from 198.18.184.105 to 198.18.184.110)
Overload keyword allows to map multiple IP addresses to a single registered IP address (many-to-one) by using different ports
The question said that appropriate interfaces have been configured for NAT inside and NAT outside statements.
This is how to configure the NAT inside and NAT outside, just for your understanding:
Weaver(config)#interface fa0/0
Weaver(config-if)#ip nat inside
Weaver(config-if)#exit
Weaver(config)#interface s0/0
Weaver(config-if)#ip nat outside
Weaver(config-if)#end
Finally, we should save all your work with the following command:
Weaver#copy running-config startup-config
Check your configuration by going to “Host for testing” and type:
C:\>ping 192.0.2.114
The ping should work well and you will be replied from 192.0.2.114
Other lab-sims on this site:
CCNA Configuration SIM Question (RIPv2 SIM)
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Can anyone explain how the ISP is set up because I cannot get to ping the ISP which I tried to configure with packet tracer.
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you need to add an ip address and default gateway to the switch
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dear Ruth ISPs normally assign public ip adresses which are routable across internet and your private ip addresses are not routable across internet. try to check if you have configured NAT in your gateway router to perform the stated scenario.secondly check the encapsulation type on your serial link to the ISP may be there is mismatch. please also correct me where neccesary
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Do they tell you specifically what name should you use or you use “mypool” just because?
Can You give running Link
do we need to configure loopback on the router?
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dear,nyaan loopback on router just due to ping n knew that router intact through serial port.loopback is ever up so its helpful to knew that your serial link working well.if no ping other link than you should check that there is problem yet loopback ping successfully..
thanks
I configured this sim and i was able to ping from ISP to host but while pinging from host to ISP it showed request timed out…. Could anyone please help me out..?
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@m Check with show ip nat translations to see if your NAT works, you will the 2 PCs private addresses to be translated into a public one
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hey please help me, i am not able to ping 192.0.2.114
Weaver#sh run
Building configuration…
Current configuration : 765 bytes
!
version 12.2
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Weaver
!
!
!
enable password cisco
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0
ip address 192.168.100.30 255.255.255.240
ip nat inside
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
duplex auto
speed auto
shutdown
!
interface Serial0/0
ip address 192.0.2.113 255.255.255.0
encapsulation frame-relay
ip nat outside
!
ip nat pool mypool 198.18.184.105 198.18.184.110 netmask 255.255.255.248
ip nat inside source list 1 interface Serial0/0 overload
ip classless
!
!
access-list 1 permit 192.168.100.16 0.0.0.15
!
!
!
!
!
line con 0
password cisco
login
line vty 0 4
login
!
!
!
end
this is configuration, still i am not able to ping, please tell me, where i am wrong, i am giving exam tomorrow.
any one can tell me where can i get cisco packet tracer
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snajyot, your configuration is incorrect. You have created and configured the pool statement correctly, but then have used PAT with overload instead of Static nat with overload in the command
ip nat inside source list 1 interface Serial0/0 overload
it should be
ip nat inside source list 1 pool mypool overload