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If the Windows DC is doing DHCP, then each switch with devices that need a DHCP address should have a setting that points to the DC as the DHCP server. The setting would be for an "IP Helper" or "DHCP Relay". If another device is handing out DHCP addresses, that can lead to a conflict with the Windows server.

"Next step" is either what the business needs are. If you're not in a business and this is a lab, then it's to set up a scenario you want to work with. If it is your lab, I'd make sure that the firewall is set to block incoming traffic from the nasty old Internet.

So glad to have your reply, thank you.
With my current network setup, I want to let those devices connected to vlan 1 have internet access, refer "picture 2".
Possible? Or you have better/easier suggestion?

Hi, please refer to this new "picture 2". It is more clear on what I want to achieve and my current network setup.

Please guide/advise me, thank you.

Dear all,

I have a situation here:

- DHCP is managed by a Windows Domain Controller.
- I have a sophos xg210 firewall.
- I have a Dlink DGS-1510-28X network switch, assumed this is "A"
- I have another 2 network switches, assumed these are "B" and "C"
- A, B and C are linked.
- Please refer to attachment (Pciture 1).

I already set a vlan in the Dlink switch(port 1 to 6) and the vlan port is able to issue ip addresses to devices connected
to these ports(port 1 to 6).

My question is:
I don't know what the next configuration to do to let those devices connected to ports 1 to 6 have internet access and access my local network.

*I may ask more questions along the way, please bear with me, and be patient. Thank you so much