Comments on: DHCP for VLANs

By: ihavesomedoubtnvlan

ihavesomedoubtnvlan — Mon, 11 Jun 2012 08:48:01 +0000

i can not configure use different vlans in cisco packet tracer for dhcp.

By: sithu

sithu — Fri, 05 Feb 2010 07:59:55 +0000

Dear Ccie7335

Is it ok if i could create vlan on global configuration mode and add the ip to vlan interface?
I don’t know this command really because I’m now only CCNA level not yet CCNP, CCIE.
But I hope Encapsulation dot1Q will work. If you have see some weekness/problem on encap dot1Q plaese tell me, I want to know.
Thanks for your advice.
SiThu

By: ccie7335

ccie7335 — Fri, 05 Feb 2010 07:11:11 +0000

wrong, wrong, wrong! I was okay with the creation of the DHCP scopes. But the whole Interface, sub-interface stuff has to go. What you need to do is create your L2 and L3 VLANs next. I will make 3 for you below:

conf t

vlan 5,6,7

interface vlan 5
ip address 192.168.1.1 255.255.255.0

interface vlan 6
ip address 192.168.2.1 255.255.255.0

interface vlan 7
ip address 192.168.3.1 255.255.255.0

Now that this is done you can either assign the VLANs to individual ports or trunk these VLANs to another switch. Let me know what you want to do and I will configure that for you too.

By: sithu

sithu — Wed, 03 Feb 2010 03:17:50 +0000

Thanks Yeahboy,

I make mistake in there. Yes it should be valid address, no network address or broadcast address.

By: yeahboy

yeahboy — Wed, 03 Feb 2010 01:03:25 +0000

I would just like to edit something on the fourth step.. The ip address for each subinterfaces should be the one indicated on your dhcp pool because it will serve as your default gateway for your vlans. *Fourth create the sub-interfaces and assign the address for each

Router(config)#int fa0/0.1*
the number behind the encapsulation dot1Q must be the same with the vlan's ID number
Router(config-subif)#encapsulation dot1Q 1
Router(config-subif)#ip add 192.168.1.0 255.255.255.0>ip add 192.168.1.1 255.255.255.0

Router(config)#int fa0/0.2
Router(config-subif)#encapsulation dot1Q 2
Router(config-subif)#ip add 192.168.2.0 255.255.255.0>ip add 192.168.2.1 255.255.255.0

Router(config)#int fa0/0.3
Router(config-subif)#encapsulation dot1Q 3
Router(config-subif)#ip add 192.168.3.0 255.255.255.0>ip add 192.168.3.1 255.255.255.0