I want to ask how to deploy a cisco router ios as a dhcp server for multiple vlans for nearly 1200 users. Do tell me if cisco router ios dhcp server is a good choice or not.
I am having a dlink DES6500 layer3 chassis switch.
On dlink 6500 I have configured 50 vlans and one vlan is connected to the utm box for internet. All vlan are talking to each other.
I have a cisco 2851 router and i have configured it as a host and as a dhcp server in a vlan in the router.
But dhcp server is serving the vlan in which it has been configured like vlan 100, but it is not serving other vlans which are configured in the router.
I have disabled ip routing and mentioned the default gateway in the router
Please tell me how a cisco router ios dhcp server can server multiple vlans
I dont want to use windows server as dhcp server as there is always a virus threat to it and windows server are very resource hungry and require good h/w configuration if it has to server 1200-1500 clients. So I want to make router as a dhcp server as cisco 2851 as gigabit ethernet ports so I hope no network bandwidth or congestion problems I ll face.
Dhcp server address is 192.168.100.2/24 that is a cisco 2851 router and I have configured native vlan i.e 100 for this ip range in the router
I have configured one dhcp scope per vlan in the router and mentioned ip helper-adress 192.168.100.2 in the vlans which are configured in the 2851 cisco router.
I have also mentioned dhcp exclude address list per vlan
when I m joining the native vlan membership i.e 192.168.100.x I am able to get ip address via dhcp server but when I switch to other vlan I am not able to get ip address from dhcp server.
I havent enabled any dhcp relay information in the dhcp server (cisco 2800 router) but i have enabled dhcp relay in the dlink 6500 layer 3 chassis switch i.e. 192.168.100.2
Pleasse help me why I am not able to get ip address from cisco ios dhcp server when I am in other vlans rather than 192.168.100.x .
Correct - however this is applicable only if we do not use a trunk link between the switch and the router.
In the scenario the switch and router are not connected via trunk link, there will be limitations at to the number of VLANs created: One vlan per router port.
The only way I believe amitaussie will be able to do his job will be via trunk link between the switch and router - this will provide the best possible flexibility and will allow him to create as many vlans required. For this, the IP Helper command will not be required as each vlan connects directly to the router and it will serve each DHCP request from the appropriate DHCP pool.