Configuring DHCP on Cisco Router with Helper IP on connected Router

[SamuelKaucher6801]

I have a simple network and I am practicing for the CCNA exam through practice in Packet tracer. I successfully managed to configure a Server to work as the DHCP but I am having difficulty in configuring Cisco router to act as a DHCP server.

Router 0

Router(config)#ip dhcp pool 192

Router(dhcp-config)#network 192.10.10.0 255.255.255.0

Router(dhcp-config)#default-router 192.10.10.1

Router(dhcp-config)#dns-server 10.10.10.1

Router(dhcp-config)#exit

Router(config)#ip dhcp pool 172

Router(dhcp-config)#network 172.10.10.0 255.255.255.0

Router(dhcp-config)#default-router 172.10.10.1

Router(dhcp-config)#dns-server 10.10.10.1

Gateway of last resort is not set

10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks

C 10.10.10.0/30 is directly connected, GigabitEthernet0/0

L 10.10.10.1/32 is directly connected, GigabitEthernet0/0

C 10.10.11.0/30 is directly connected, GigabitEthernet0/1

L 10.10.11.1/32 is directly connected, GigabitEthernet0/1

R 10.10.12.0/30 [120/1] via 10.10.10.2, 00:00:20, GigabitEthernet0/0

[120/1] via 10.10.11.2, 00:00:06, GigabitEthernet0/1

R1

Router(config)#interface gig 0/1

Router(config-if)#ip helper-address 10.10.10.1

Gateway of last resort is not set

10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks

C 10.10.10.0/30 is directly connected, GigabitEthernet0/0

L 10.10.10.2/32 is directly connected, GigabitEthernet0/0

R 10.10.11.0/30 [120/1] via 10.10.10.1, 00:00:06, GigabitEthernet0/0

C 10.10.12.0/30 is directly connected, GigabitEthernet0/2

L 10.10.12.2/32 is directly connected, GigabitEthernet0/2

192.10.10.0/24 is variably subnetted, 2 subnets, 2 masks

C 192.10.10.0/24 is directly connected, GigabitEthernet0/1

L 192.10.10.1/32 is directly connected, GigabitEthernet0/1

RIP version 2 is configured on all routers.

Ive looked at numerous tutorials and Im not sure why this is not working as Ive completed the same steps. Thanks for the help!

[MHM Cisco World]

try exclude ip address and then check again.

[Georg Pauwen]

Hello,

post the zipped Packet Tracer project (.pkt) file.

[SamuelKaucher6801]

Attached. Tried excluding address and that did not resolve the issue.

[Meheretab Mengistu · Accepted solution]

Hi, 

I saw your configurations on all routers and switches. You will need to make few changes so that the PCs will receive IP addresses and PING each other.

Here are the changes you need to make:-

==> On Router1

int gi0/1

 no ip address

int gi0/1.1

 encapsulation dot1q 1

 ip address 192.10.10.1 255.255.255.0

 ip helper-address 10.10.10.1

!

router rip

 network 192.10.10.0

end

wr mem

==> On Router2

int gi0/0

 no ip add

int gi0/0.1

 encapsulation dot1q 1

 ip add 172.10.10.1 255.255.255.0

 ip helper-address 10.10.10.1

!

router rip

 network 172.10.10.0

!

end

wr mem

The main issues were Layer3 to Layer2 connectivity between Routers and Switches, and Router0 does not know how to reach to both 192.10.10.0/24 and 172.10.10.0/24... I did not include detailed explanation on why you will need to make those changes. I just provided you the required changes.

HTH,

[SamuelKaucher6801]

Meheretab,

Thank you based in the info you provided I was able to make the changes and configure. You were right, router 0 did not know how to reach the other networks and adding the networks to router rip on Router 1 and 2 resolved the issue. Dot 1q was not needed as yet as I had not yet configured any VLAN information but it is on the to do list.