Cisco CCNA DHCP Server with Inter Vlan routing
Using DHCP Server with Inter-Vlan Routing (Router on stick)
On Last Video we talked about the router on stick that is we made sure that client from Network 10.10.10.0 can communicate with Network 20.20.20.0
In This Video we will discuss configuring DHCP with router on stick ; so it means the client will get an IP via DHCP server . Please review my video on DHCP server
Lets see what we have so far:
R1#show ip int brief
| Interface | IP-Address | OK? | Method | Status | Protocol |
| FastEthernet0/0 | unassigned | yes | unset | up | up |
| FastEthernet0/0.2 | 10.10.10.100 | yes | manual | up | up |
| FastEthernet0/0.3 | 20.20.20.100 | yes | manual | up | up |
| FastEthernet0/1 | unassigned | yes | unset | administratively down | down |
| Vlan1 | unassigned | yes | unset | administratively down | down |
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As we see we have configured the sub-interface (from our router on stick video) and here is our show run so far
R1#show run
interface FastEthernet0/0
no ip address
duplex auto
speed auto
!
interface FastEthernet0/0.2
description this will act as DG=10.10.10.100 for VLAN2
encapsulation dot1Q 2
ip address 10.10.10.100 255.255.255.0
!
interface FastEthernet0/0.3
description This Will act as DG=20.20.20.100 for VLAN 3
encapsulation dot1Q 3
ip address 20.20.20.100 255.255.255.0
!
Remember from last video on rouetr on stick we only give IP address to sub-interface , not physical interface f0/0
Now I will configure the DHCP server on R1
Hint : always start with IP DHCP ?
Remember from DHCP server video; it is done on two step process
Step 1) Exclude IP address range
Step 2) Create a scope and give IP address for Default-gatway
Step 1) Exclude the IP address for the Network 10.10.10.0
R1#config t
Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#ip dhco
R1(config)#ip dhcp ?
excluded-address Prevent DHCP from assigning certain addresses
pool Configure DHCP address pools
relay DHCP relay agent parameters
R1(config)#ip dhcp ex
R1(config)#ip dhcp excluded-address ?
A.B.C.D Low IP address
R1(config)#ip dhcp excluded-address 10.10.10.100
R1(config)#
R1(config)#
Step 2) Now I will give the Scope for the network 10.10.10.0
R1(config)#ip dhcp ?
excluded-address Prevent DHCP from assigning certain addresses
pool Configure DHCP address pools
relay DHCP relay agent parameters
R1(config)#ip dhcp poo
R1(config)#ip dhcp pool ?
WORD Pool name
R1(config)#ip dhcp pool LAN10
R1(dhcp-config)#
R1(dhcp-config)#
R1(dhcp-config)#?
default-router Default routers
dns-server Set name server
exit Exit from DHCP pool configuration mode
network Network number and mask
no Negate a command or set its defaults
option Raw DHCP options
R1(dhcp-config)#network 10.10.10.0 255.255.255.0
R1(dhcp-config)#default-router 10.10.10.1
Here is show run so far
R1#show run
ip dhcp excluded-address 10.10.10.100
!
ip dhcp pool LAN10
network 10.10.10.0 255.255.255.0
default-router 10.10.10.1
!
Now I will do same concept for Network 20.20.20.0
Step 1) Exclude the IP address for the Network 20.20.20.0
R1#config t
Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#ip dhco
R1(config)#ip dhcp ?
excluded-address Prevent DHCP from assigning certain addresses
pool Configure DHCP address pools
relay DHCP relay agent parameters
R1(config)#ip dhcp ex
R1(config)#ip dhcp excluded-address ?
A.B.C.D Low IP address
R1(config)#ip dhcp excluded-address 20.20.20.100
R1(config)#
R1(config)#
Step 2) Now I will give the Scope for the network 20.20.20.0
R1(config)#ip dhcp ?
excluded-address Prevent DHCP from assigning certain addresses
pool Configure DHCP address pools
relay DHCP relay agent parameters
R1(config)#ip dhcp poo
R1(config)#ip dhcp pool ?
WORD Pool name
R1(config)#ip dhcp pool LAN20
R1(dhcp-config)#
R1(dhcp-config)#
R1(dhcp-config)#?
default-router Default routers
dns-server Set name server
exit Exit from DHCP pool configuration mode
network Network number and mask
no Negate a command or set its defaults
option Raw DHCP options
R1(dhcp-config)#network 20.20.20.0 255.255.255.0
R1(dhcp-config)#default-router 20.20.20.1
Here is show run so far
R1#show run
ip dhcp excluded-address 10.10.10.100
ip dhcp excluded-address 20.20.20.100
ip dhcp pool LAN10
network 10.10.10.0 255.255.255.0
default-router 10.10.10.1
!
ip dhcp pool LAN20
network 20.20.20.0 255.255.255.0
default-router 20.20.20.1
Now If I go to all PC and make them DHCP client , they will have ip address and will be ping from Network 10.10.10.0 to Network 20.20.20.0
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