Can't ping other PC routers and servers

[Malter17]

why when I try to ping Client in another router can't and if i try ping to server unreachable?

password :

pass

admin

[liviu.gheorghe]

There are some problems with your configuration:

1. All WRT300 routers are DHCP server for wireless clients, but all assign the same IP address range:192.168.0.100 - 192.168.0.149

2. WRT300 routers are connected to the 2960-24 switch and configured in different vlans WRT300 Router 1 - vlan 10, WRT300 Router 2 - vlan 20, WRT300 Router 3 - vlan 30, WRT300 Router 4 - vlan 40 which is not consistent with the fact that all WRT300 routers assign the same IP subnet to wireless clients

Cannot access the 2811 router - the enable password is not working.

Do you have some assignment requirements?

[Malter17]

No, I was just given the topology and table as is...
Btw, the enable password is can

[liviu.gheorghe · Accepted solution]

The only way I was able to make this work is as follows:

For the WRT300N routers - assign the "Internet" link (the link to the switch) an IP via DHCP - it doesn't allow static IP assignment.

For this to work, you have to configure a DHCP server on the 2811 Router0:

ip dhcp pool vlan10

network 10.10.10.0 255.255.255.0

default-router 10.10.10.254

dns-server 172.16.0.2

ip dhcp pool vlan20

network 10.10.20.0 255.255.255.0

default-router 10.10.20.254

dns-server 172.16.0.2

ip dhcp pool vlan30

network 10.10.30.0 255.255.255.0

default-router 10.10.30.254

dns-server 172.16.0.2

ip dhcp pool vlan40

network 10.10.40.0 255.255.255.0

default-router 10.10.40.254

dns-server 172.16.0.2

The IP range for the wireless clients, I've configured it like this:

Router1: IP 192.168.0.1, subnet 192.168.0.0/26

Router2: IP 192.168.0.65, subnet 192.168.0.64/26

Router3: IP 192.168.0.129, subnet 192.168.128.0/26

Router4: IP 192.168.0.193, subnet 192.168.0.192/26

The Router1-4 will NAT the wireless IP, 192.168.0.x, to that that of the Internet interface, 10.10.x.1, of each router and for that reason you will not be abpe to ping other wireless clients.

You will be able to access the servers 172.16.0.2, 172.16.0.3 and 172.16.0.4.

Another thing - on the switch configure the trunk interface, Fa0/5, without access vlan 20 and native vlan 20:

MalterSW(config)#int fa0/5

MalterSW(config-if)#no switchport access vlan 20

MalterSW(config-if)#no switchport trunk native vlan 20

The lack of clear and detailed instructions doesn't help and leaves a great deal to ones imagination.

I'm attaching the PT file with the changes I've made.

[Malter17]

Excuse me sir, I want to ask something about NAT (because I haven't learned anything about NAT), does every wireless network have to be NAT? If so, what happens if a wireless network is not NATed?

[liviu.gheorghe · Accepted solution]

No, not every wireless network needs to be NAT-ed. What NAT does is change the source of the IP packets originating form your inside network, which uses RFC 1918 private IP addresses, when accessing the Internet. This is because RFC 1918 private IP addresses should not be used on the Internet because they are intended to be used only in private LAN's.

The WRT300 routers from your lab is a SOHO (Small Office Home Office) device which is used to provide wireless access in your home/office and to provide Internet access. In the lab you cannot disable the NAT feature for this device.

If your lab would have used other equipment with more features than the WRT300, other configurations could be implemented.

[liviu.gheorghe · Accepted solution]

And to answer the last part of your question - if NAT is not implemented, than the packet is forwarded with it's original IP address. This is the reason that I configured some static routes in the Cisco 2811 in order for the router to be able to route the returning traffic to the correct WRT300:

ip route 192.168.0.0 255.255.255.192 FastEthernet0/0.10

ip route 192.168.0.64 255.255.255.192 FastEthernet0/0.20

ip route 192.168.0.128 255.255.255.192 FastEthernet0/0.30

ip route 192.168.0.192 255.255.255.192 FastEthernet0/0.40

[Malter17]

o... I see, thank you for all the explanations and help, it really helps me who is still learning...

[liviu.gheorghe]

You are welcome. Happy to help.