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Guest Vlan setup between SG300-28P & WAP121

Dear all,

We have a SG300-28P which has 2 WAP 121 attached to it, and we wish to setup a staff wifi (internet + intranet) and a guest wifi (internet only).

I've looked through tonnes of posts and followed them to the best of my ability but still can't make it work - DHCP just isn't assigned to the guest wifi clients.

Here's the setup (with just 1 WAP for now):

TPLink ER-6120 Router (the only DHCP server) - (VLAN1), subnet

DHCP range -, default gateway - itself (

Multi-net NAT is setup with, interface LAN, for VLAN 3

Static Route is setup with Destination -, Subnet, Next Hop -, Interface - LAN

SG300-28P - (VLAN1), subnet, default VLAN 1

VLAN setup - VLAN 1, 2 (auto voice vlan), 3 (guest)

Port VLAN Membership - Port 28 to TPLink - 1UP 2T 3T, Port 12 to WAP121 (1UP, 3T)

IP Configuration - IPv4 Interface - VLAN 1 DHCP IP- Mask- Status Valid.

VLAN 3 STATIC IP Mask- Status Valid

IPv4 Routes -

1., prefix length 0, route type Remote, Next Hop, Route Owner Static, metric 2

2., prefix length 24, route type Local, next Hop, Route Owner Directly Connected

3., prefix length 24, route type Local, next Hop, Route Owner Directly Connected

DHCP Relay - enabled, Option 82 not ticked, DHCP relay Server Table - DHCP Snooping not enabled

DHCP Interface table - VLAN 3, Interface Ip, DHCP Relay enabled, DHCP Snooping disabled

WAP121 -

VLAN & IPv4 Address - Untagged VLAN ticked, Untagged VLAN and Management VLAN ID are both 1

IPv4 Settings  - DHCP

Wireless Networks - There's the staff SSID with VLAN 1, and Guest SSID with VLAN 3

If someone can help me solve this issue, I'd be eternally grateful!!



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