Changing DHCP Scope brought down the Internet connection

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Changing DHCP Scope brought down the Internet connection – Managing your servers can streamline the performance of your team by allowing them to complete complex tasks faster. Plus, it can enable them to detect problems early on before they get out of hand and compromise your business. As a result, the risk of experiencing operational setbacks is drastically lower.

But the only way to make the most of your server management is to perform it correctly. And to help you do so, this article will share nine tips on improving your server management and fix some problem about windows, dhcp, vlan, , .

My school DHCP server(Win2008) runs out of IPs so I expanded the scope:
original: 10.20.1.0 to 10.20.2.255
new: 10.20.1.0 to 10.20.3.255

But as soon as I finished it, all my workstations could not get outside connection any more while internal connection has no problem.

FYI: The DHCP has multiple scopes. We have multiple VLANs set up. School wide we have eight Cisco 2950 switches and two 3650 core switches. No Cisco routers but one ASA5510 firewall.

I guess other than simply expanding the scope we will have to do something related to the vLans, but I am just not so sure. Thanks for your help in advance.

Solution :

Did you change the subnet to be larger (on all devices in this subnet, static and DHCP-defined), as well? If you didn’t, that’s most likely one of your many problems. You can’t just expand a subnet without changing the netmask for all devices on the subnet.

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