Simple GS1900-24E Vlan Config Problem

NotoriousCanary

I'm new to my Zyxel GS1900-24E router so I'm probably missing something simple, but I can't see the DHCP server on my second VLAN and can't figure out why - so any help appreciated.

I am trying to setup two VLANs on the router.

VLAN1 (Home) is the default VLAN with port members 1-20.

VLAN2(Office) is the only other VLAN with port members 1 and 21-24.

So Port 1 is the only port common to both VLANs.

The network hub and DHCP server are connected to Port 1, and Port 1 is enabled for VLAN trunking.

Because Port 1 is a member of both VLANS, I think this means that I should be able to serve DHCP addresses to devices connected to either VLANs, but it only works for devices attached to VLAN1 ports and not VLAN2 ports.

All ports are set for 'Ingress Checking'; all ports are set for 'Untagged' data.

What am I missing or doing wrong. Thanks for all help and pointers.

John W

XiLeiHaLo

Hmm… I think the GS1900-24E is a switch rather than a router, and each switch port can only have a single PVID (native VLAN).

You’ve already proved that your device obtained a DHCP address from port 1, so its PVID must be 1. Therefore, to obtain a DHCP address from VLAN 2, you need to change the port’s PVID to 2 for your end devices.

A more advanced network setup that can meet your requirement would involve running a RADIUS server with 802.1X dynamic VLAN assignment on the switch. In this setup, the RADIUS server decides which VLAN each connected client belongs to. However, you will need to understand how to configure the appropriate rules on the RADIUS server."

Zyxel_Tina

Hi @NotoriousCanary,

Welcome to the Zyxel Community!

Here’s how to correctly configure your GS1900-24E to enable DHCP for both VLANs:

1. Port 1 Configuration (Uplink/Trunk Port):
   • For Port 1, configure it as an untagged member of VLAN1 and a tagged member of VLAN2. This allows VLAN2 traffic, including DHCP requests, to pass through with its VLAN tag, while VLAN1 traffic remains untagged.
2. PVID Settings for Client Ports:
   • For client ports 2-20 (VLAN1 Home), set their PVID to 1.
   • For client ports 21-24 (VLAN2 Office), set their PVID to 2.
   • Keep these ports configured to transmit Untagged data to end devices.