Routing in cisco router

i provide you cisco packet tracer network diagram i want to ping the pc from one network to another network how can i do this through routing in three cisco routers

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Thomas GrassiSystems AdministratorCommented:
First start with a tracert

If you route to the other end you will be able to ping provided the computers firewall settings allow ping

What is the OS of the computers?
ManojtanwarAuthor Commented:
os is mostly windows 7 ping will not allow because i did not done routing router

Tracing route to over a maximum of 30 hops

  1     1 ms     4 ms     4 ms
  2     4 ms     4 ms     4 ms
  3    14 ms    13 ms    13 ms
  4     *        *        *     Request timed out.
  5     *     ^C
ManojtanwarAuthor Commented:
when i ping local ip it going to default gatway of internet
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Thomas GrassiSystems AdministratorCommented:
For Ping: this is a reply by the machine on the network when request is sent to this machine's IP address. Why it is necessary: suppose you have multiple machines and you want to know if there is machine on the network with given IP. That's when you use ping. This packet is classified as ICMP (Internet Control Message Protocol).

Anyway, here is how to enable ping response in Windows 7:

Control Panel --> System and security --> Windows Firewall --> Advanced settings --> Inbound rules --> New rule --> custom rule

in Protocol and ports: Protocol: ICMPv4
on the same panel go to customize, choose "Specific ICMP types", check the box "echo request"
st make sure your windows 7 computers firewall have this

On the local computer do ipconfig /all and post results
Also do a route print  post results
ManojtanwarAuthor Commented:
no dear
i cannot ping even through console between three router having ip and ping and

may be i doing some thing wrong in access list

router configuration of three routers are in the cisco tracer diagram

Thomas GrassiSystems AdministratorCommented:

Lets start here

Also I did not see any of your attachments are you sure you attached them?

How are the three routers connected?     Same lan > VPN ???

can you ping an internet address from any router? from any computer?

Do all three routers have a wan interface?

Post the configs of each router
Post ipconfig /all from computers.
ManojtanwarAuthor Commented:
We have a lease line from isp we terminater this into one 24 port switch.  now we three router all of them have two ports fa0/0 and fa0/1 and we treate fa0/0 as a WAN port on three router.  now three wires from above 24 ports switch connected to wan ports and give public ip. Now router one fa0/1(lan port) is connected to another 24 portswitch which have connected 20 computer and receive the dhcp address in the series of
Now router two fa0/1(lan port) is connected to another 24 portswitch which have connected 20 computer and receive the dhcp address in the series of
Now router three fa0/1(lan port) is connected to another 24 portswitch which have connected 20 computer and receive the dhcp address in the series of
i can ping the all public ip of router from any computer but i cannot ping the computers between the three networks
if i understand this due that all three routers wan port connected through same swicth.
but lan port are seperate.  now i want to apply ACL in the router to access the other network computers.

hopefully i explain correctly

Can you provide network diagram?
I am not sure what you need, but if I understand your configuration:
you have leased lines between your offices that are terminated on the same switch
all internet traffic is used from some central location .. so that is only place that you really need NAT, and not on every router (every router have the same default route - ip route

If there is not NAT on every router (my guess is that you really don't need it in your configuration) - you can simply create static routes, or use some routing protocol (preferred). After that you can adjust rights in your network using ACL.
ManojtanwarAuthor Commented:

i upload the diagram in which we have a lease line from isp then terminate the lease into 24 port switch having public ip's pool and default gateway. we have to provide internet to all pc so we have provide default gateway of fa0/0 of three routers are connected in 24 port switch where lease line from isp terminate.
then fa0/1 port of all three routers connected to 3 nos 24 ports switch. in this current configuration i can ping wan port of three router from any private network like but i cannot ping between private ips. due lack of static route or natting. please provide me the natting command or static route so that i can ping to or

Thomas GrassiSystems AdministratorCommented:
Can you give us the output of "Show IP Route" and "show IP interface brief"

From each router and post
Thomas GrassiSystems AdministratorCommented:
You can partially NAT your traffic.
You need to NAT only traffic that is routed to any addresses than your private address space.

First you deny NAT for your ip address range of neighbor networks,  so ip address of sender will not change.
I will do that only for router 1 - you can use template to make it work for other routers...

Router 1
access-list 101 deny
!            traffic network traffic will not be natted (if this is even word :) )
access-list 101 deny
!           the same thing for network
access-list 101 permit any
!           all other traffic will be natted
ip nat inside source list 101 interface fa0/0 overload
!           then you need routes to other networks - is on R3, network is on R2
ip route
ip route

As long as you don't start using security on your WAN interface - this should work, and as long as everything is terminated on the same switch. :)

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