Dynamically assign IP address from different subnet to PCs which are connected to same switch.

[nilaypatel31294]

How can I assign IP addresses as shown in attachment using DHCP?

[Julio E. Moisa · Accepted solution]

Hi

You should create the gateway for each subnet  and dhcp scopes on the router. Also a router on a stick must be applied to this scheme.  Please let me share the configuration.

ROUTER 

Asumming you are using 2 differents vlans, for example 2 and 3

*Create sub interface where the vlan identifier will be applied through encapsulation dot1q, it will help us to enable the routing inter_vlan. 

interface FastEthernet0/0
no ip address
no shutdown
!
interface FastEthernet0/0.2
encapsulation dot1Q 2
ip address 10.5.2.1 255.255.255.0
!
interface FastEthernet0/0.3
encapsulation dot1Q 3
ip address 10.5.3.1 255.255.255.0

*Create the DHCP scopes. 

ip dhcp excluded-address 10.5.2.1    <---- excluding the IP associated to the gateway of vlan 2
ip dhcp excluded-address 10.5.3.1    <---- excluding the IP associated to the gateway of vlan 3

ip dhcp pool DHCP-VLAN2
network 10.5.2.0 255.255.255.0
default-router 10.5.2.1
dns-server 8.8.8.8 4.2.2.2
!
ip dhcp pool DHCP-VLAN3
network 10.5.3.0 255.255.255.0
default-router 10.5.3.1
dns-server 8.8.8.8 4.2.2.2

SWITCH

You must configure the interface facing to the router as trunk. Example:

interface g1/1/1
description Point-to-Point_with_Router
switchport trunk encapsulation dot1q
switchport mode trunk
no shutdown

Also remember to create the vlans on both switches. And the trunk interfaces between both switches.

conf t

vlan 2
name VLAN-X

vlan 3
name VLAN-Y

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:-)

[nilaypatel31294]

Thank you so much for your quick replay and sorry for my late response. That was really helpfull.

[Julio E. Moisa]

Hi

It was a pleasure my friend.

Have a great day!

:-)