7.5.3 Packet Tracer – Troubleshooting Wireless WRT300N Answers

7.5.3 Packet Tracer – Troubleshooting Wireless WRT300N Answers

Topology

Addressing Table

Scenario

In this lab, a basic network and wireless network have been configured improperly. You must find and correct the misconfigurations based on the minimum network specifications provided by your company.

Here are the configurations to load into your router and switches.

[Instructors Note: Missing configurations in red and incorrect configurations in strike-through red]

R1 Configuration

hostname R1
!
interface Loopback0
 ip address 10.1.1.1 255.255.255.0
!
interface FastEthernet0/1
 no ip address
 duplex auto
 speed auto
 no shutdown
!
interface FastEthernet0/1.5
 encapsulation dot1Q 5
 ip address 5.5.5.10 255.255.255.0
!
interface FastEthernet0/1.10
 encapsulation dot1Q 10
 ip address 192.168.11.1 255.255.255.0
 ip address 192.168.10.1 255.255.255.0
!
interface FastEthernet0/1.11
 encapsulation dot1Q 11
 ip address 11.11.11.1 255.255.255.0
!
interface FastEthernet0/1.18
 encapsulation dot1Q 18
 ip address 18.18.18.1 255.255.255.0
!
ip route 192.168.20.0 255.255.255.0 192.168.10.2
ip route 192.168.30.0 255.255.255.0 192.168.10.3
ip route 192.168.20.0 255.255.255.0 192.168.10.3
ip route 192.168.30.0 255.255.255.0 192.168.10.2
!
line con 0
 exec-timeout 0 0
 logging synchronous
!
end

Switch 1 Configuration

hostname S1
!
vtp mode transparent
!
vlan 5,10-11
vlan 18
!
interface FastEthernet0/1
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 5,10,11,18
 switchport mode trunk
!
interface FastEthernet0/2
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 5,10,11,18
 switchport mode trunk
!
interface FastEthernet0/3
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 5,10,11,18
 switchport mode trunk
!
interface FastEthernet0/4
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 5,10,11,18
 switchport mode trunk
!
interface FastEthernet0/5
 switchport trunk encapsulation dot1q
 switchport mode trunk
!
interface Vlan5
 ip address 5.5.5.1 255.255.255.0
 no shutdown
!
line con 0
 exec-timeout 0 0
 logging synchronous
!
End

Switch 2 Configuration

hostname S2
!
vtp mode transparent
ip subnet-zero
!
vlan 5,10-11,18
!
interface FastEthernet0/1 
switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 5,10,11,18
 switchport mode access
 switchport mode trunk
!
interface FastEthernet0/2
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 5,10,11,18
 switchport mode access
 switchport mode trunk
!
interface FastEthernet0/3
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 5,10,11,18
 switchport mode access
 switchport mode trunk
!
interface FastEthernet0/4
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 5,10,11,18
switchport mode access
switchport mode trunk
!
interface FastEthernet0/7
switchport trunk encapsulation dot1q
 switchport trunk native vlan 10
 switchport mode trunk
!
interface FastEthernet0/11
 switchport access vlan 11
 switchport mode access
 switchport port-security mac-address sticky
switchport port-security mac-address sticky 0336.5b1e.33fa
!!! Note: While this may appear in the running configuration after
configuring sticky mac-address port security, unless PC1 and PC4 have
these addresses, they will be denied access. The student must remove these
incorrectly pre-set sticky addresses and have the switch properly and
dynamically discover the PC1 and PC4 addresses.
!
interface FastEthernet0/18
 switchport access vlan 18
 switchport mode access
 switchport port-security
 switchport port-security mac-address sticky
switchport port-security mac-address sticky 022c.ab13.22fb
!
interface Vlan1
 no ip address
 shutdown
!
interface Vlan5
 ip address 5.5.5.2 255.255.255.0
 no shutdown
!
line con 0
 exec-timeout 0 0
 logging synchronous
!
End

Switch 3 Configuration

hostname S3
!
vtp mode transparent
!
vlan 5,10-11,18
!
interface FastEthernet0/1
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 5,10,11,18
 switchport mode trunk
!
interface FastEthernet0/2
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 5,10,11,18
 switchport mode trunk
!
interface FastEthernet0/3
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 5,10,11,18
 switchport mode trunk
!
interface FastEthernet0/4
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 5,10,11,18
 switchport mode trunk
!
interface FastEthernet0/7
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 11
 switchport mode trunk
!
interface Vlan1
 no ip address
 no ip route-cache
shutdown
!
interface Vlan5
 ip address 6.6.6.3 255.255.255.0
 ip address 5.5.5.3 255.255.255.0
no shutdown
!
line con 0
 exec-timeout 0 0
 logging synchronous
!
end

Wireless Router Network Requirements

While troubleshooting WRS2 and WRS3, ensure that at least the following capabilities exist:

1. Connections via the IP addresses shown in the topology diagram.
2. More than 30 clients can get an IP address through DHCP at a single time.
3. A client can have a DHCP address for at least 2 hours.
4. Clients using both B and G wireless network modes can connect, but N clients cannot.
5. Wireless clients must be authenticated using WEP with a key of 5655545251.
6. Traffic between PC2 and PC3 must take the most efficient route possible.
7. Ping requests coming from outside WAN ports of the Linksys routers to their inside LAN/wireless IP addresses (192.168.30.1) must be successful.
8. DHCP must not give out IP addresses in a range that includes the addresses for PC2 and PC3.
9. The two wireless networks must not interfere with each other.

Wireless Network Solution

Errors on WRS2

WRS2 should have an IP address of 192.168.10.2 and a default gateway of 192.168.10.1, instead of the following: (violates condition #1)

DHCP is configured to give out addresses in the range of 192.168.20.2 – 65. The PC2 address 20.2 falls in this range. While DHCP has reserved the 20.2 address and will not give it out via DHCP to any computer but PC2, it is best practice to only give out addresses in an unused range. Changing the start IP address to above 20.2 circumvents this problem. (violates condition #8)

In the Advanced Routing tab, the static route to the WRS3 clients is configured incorrectly. The gateway of 192.168.10.1 is the inefficient route we are trying to avoid. Instead of pointing toward R1, the static route should point directly to WRS3 with the IP address 192.168.10.3. Change Gateway to this address. (Not doing this violates condition #6)

In the Security tab, Filter Anonymous Internet Requests must be unchecked if pings coming from outside the router’s LAN/wireless network to 192.168.20.1 are to be successful. Make sure that it is unchecked. (violates condition #7)

Errors on WRS3

DHCP is configured to give out only two IP addresses at a time and for only 40 minutes. (violates conditions #2 and #3)

Change the Maximum Number of Users to at least 30 and the Client Lease Time to at least 120 minutes.

In the Advanced Routing tab, the static route that is configured to efficiently route between WRS2 and WRS3 is incorrect. (violates condition #6)

Instead of the destination being 192.168.67.0, it should be 192.168.30.0.

In the Wireless Security tab, RADIUS authentication is configured, but clients are supposed to authenticate via WEP. (violates condition #5)

Change the Security Mode to WEP and use a key of 5655545251.

Wireless Connectivity Issues

Conditions 4 and 9 call for a wireless network mode of B/G on non-overlapping channels. The configuration on WRS2 is as follows:

The configuration on WRS3 is as follows:

Change the network mode on both routers to be B/G and make sure that the channels do not overlap, for example, one could be on channel 1 and another on channel 6.

Download Packet Tracer (.pka) file:

7.5.3 Packet Tracer - Troubleshooting Wireless WRT300N .pka

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