Help with setting up 2nd DHCP Scope SWGFL

[SWICT]

Hi Guys,

Wondering if someone would be kind enough to help me out.

 

Ive just found out we have an additional range of ips available to our site, great news!

 

We have an LEA switch (cisco 2950) which provides the feed coming in, apparently we have only been using Port 1 (admin range), Port 2 (curric range) is not patched in but according to the local LEA and the grid is ready to go.

 

How would I go about adding the additional scope into DHCP?

 

My current scope (admin range is) 10.x.x.x with a subnet of 255.255.255.0 and works fine, how would I go about adding the new scope which is 10.x.x.x.x with a subnet of 255.255.252.0?

 

Im confused about what I would set as the default gateway and dns servers of the second scope, would I use my exisiting default gateway and dns settings?

 

Sorry if this doesnt make much sense, Im aware of how to create and authorize the scope just dont have the knowledge for dealing with multiple ip ranges

 

Thanks

 

Mike

[3s-gtech]

Are the two ranges you've been given consecutive, e.g. 10.214.250.0 and 10.214.251.0?

[SWICT]

Hi,

The ranges are;

10.74.202.x and 10.43.40.x if that helps?

 

Thanks

 

Mike

[MatthewL]

If that was me and unable to get another range from the LA, what I would do is install a firewall, use a 10 address as such as an external IP and then NAT things if needed, its how we do things on the NHS N3 network.

[Boredguy]

Any reason for not just moving all your machines across to the curriculum range instead of trying to link the 2 together. It might be the easier route, and means you get access to 4 times the number of IP addresses than you currently have available.

[SWICT]

Im thinking that may be the way to go to be honest as looking into it sounds like its going to be a nightmare to try and setup.

 

Do you think it would be easier to setup a new dhcp server and decomm the old one?

 

Thanks to everyone for your replies, much appreciated

 

Mike

[Boredguy]

It's not just the DHCP you would need to update, there is also your static IP's on your domain controllers and the DNS.

 

It's certainlythe simplier route in the long run.

[saihaynes]

Boredguy has provided a valid solution and is right youd need at the very least to change static ips, dns etc

 

Would need a few more details about your specific setup but from experience there are a few ways round this;

 

1. Since you are virtualized you could easily assign a second nic with the second scope options configured

 

2. Using the single NIC and configuring the NIC of the DHCP server with addresses on

*both* subnets (e.g. 255.255.255.0 and 255.255.252.0), and then enable IP routing on the machine.

 

3. Plugging in a second switch fed from Port 2 of the Cisco unit and then create vlans to route the traffic

 

Of course there are pros and cons to each and everybody has their own opinion on the 'best' way to do things, but food for thought

 

SWICT and boredguy which Swindon schools are you guys from?

Edited November 29, 2012 by saihaynes