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Technical Tip: Dynamic VLAN assignment for SSID clients in bridge & tunnel mode using radius authentication via FortiAuthenticator
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Fortigate – Dynamic VLAN (bridge mode)
In this example we will create a wireless VAP in bridge mode with dynamic VLAN assignment via radius serverbased on group membership.
Next we create the vlans on the Fortigate interface upon which the FortiAPs are connected.
We have vlans v1000 and v2000 off the internal interface:
Next we’ll need firewall policies to allow traffic out to the internet for each vlan. This is where different security policies can be applies to each vlan.
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WIFI Dynamic user VLAN assignment
Dynamic user VLAN assignment
Clients connecting to the WiFi network can be assigned to a VLAN. You can do this with RADIUS attributes when the user authenticates or with VLAN pooling when the client associates with a particular FortiAP. You cannot use both of these methods at the same time.
VLAN assignment by RADIUS
You can assign each individual user to a VLAN based on information stored in the RADIUS authentication server. If the user’s RADIUS record does not specify a VLAN ID, the user is assigned to the default VLAN for the SSID.
The RADIUS user attributes used for the VLAN ID assignment are:
IETF 64 (Tunnel Type)—Set this to VLAN.
IETF 65 (Tunnel Medium Type)—Set this to 802
IETF 81 (Tunnel Private Group ID)—Set this to the VLAN ID. To configure dynamic VLAN assignment, you need to:
- Configure access to the RADIUS server.
- Create the SSID and enable dynamic VLAN assignment.
- Create a FortiAP Profile and add the local bridge mode SSID to it.
- Create the VLAN interfaces and their DHCP servers.
- Create security policies to allow communication from the VLAN interfaces to the Internet.
- Authorize the FortiAP unit and assign the FortiAP Profile to it.
To configure access to the RADIUS server
- Go to User & Device > RADIUS Servers and select Create New .
- Enter a Name , the name or IP address in Primary Server IP/Name , and the server secret in Primary Server Secret .
- Select OK .
To create the dynamic VLAN SSID
- Go to WiFi & Switch Controller > SSID , select Create New > SSID and enter:
- Enable dynamic VLAN in the CLI. Optionally, you can also assign a VLAN ID to set the default VLAN for users without a VLAN assignment.
config wireless-controller vap edit dynamic_vlan_ssid set dynamic-vlan enable set vlanid 10
To create the FortiAP profile for the dynamic VLAN SSID
- Go to WiFi & Switch Controller > FortiAP Profiles , select Create New and enter:
- Adjust other radio settings as needed.
To create the VLAN interfaces
- Go to Network > Interfaces and select Create New > Interface .
- Repeat the preceding steps to create other VLANs as needed.
Security policies determine which VLANs can communicate with which other interfaces. These are the simple Firewall Address policy without authentication. Users are assigned to the appropriate VLAN when they authenticate.
To connect and authorize the FortiAP unit
- Connect the FortiAP unit to the FortiGate unit.
- Go to WiFi & Switch Controller > Managed FortiAPs .
- When the FortiAP unit is listed, double-click the entry to edit it.
- In FortiAP Profile , select the FortiAP Profile that you created.
- Select Authorize .
VLAN assignment by VLAN pool
In an SSID, you can define a VLAN pool. As clients associate to an AP, they are assigned to a VLAN. A VLAN pool can
l assign a specific VLAN based on the AP’s FortiAP Group, usually for network configuration reasons, or l assign one of several available VLANs for network load balancing purposes (tunnel mode SSIDs only)
To assign a VLAN by FortiAP Group – CLI
In this example, VLAN 101, 102, or 103 is assigned depending on the AP’s FortiAP Group.
config wireless-controller vap edit wlan set vlan-pooling wtp-group config vlan-pool edit 101 set wtp-group wtpgrp1
next edit 102 set wtp-group wtpgrp2
next edit 101 set wtp-group wtpgrp3
Configuring user authentication
Load balancing
There are two VLAN pooling methods used for load balancing: The choice of VLAN can be based on any one of the following criteria:
l round-robin – from the VLAN pool, choose the VLAN with the smallest number of clients l hash – choose a VLAN from the VLAN pool based on a hash of the current number of SSID clients and the number of entries in the VLAN pool
If the VLAN pool contains no valid VLAN ID, the SSID’s static VLAN ID setting is used.
To assign a VLAN by round-robin selection – CLI
In this example, VLAN 101, 102, or 103 is assigned using the round-robin method:
config wireless-controller vap edit wlan set vlan-pooling round-robin config vlan-pool edit 101 next edit 102 next edit 103 end
To assign a VLAN by hash-based selection – CLI
In this example, VLAN 101, 102, or 103 is assigned using the hash method:
config wireless-controller vap edit wlan set vlan-pooling hash config vlan-pool edit 101 next edit 102 next edit 103 end
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Because the tunnel mode SSID creates a layer 3 virtual interface on the FortiGate and thus VLANs would be matched that are bound to that SSID interface. When SSID is in bridge mode. ... Based on the above explanation, the tunnel mode dynamic VLAN assignment will only map the VLAN interface which is on the SSID interface. If the users are needed ...
To configure dynamic VLAN name assignment: Configure a RADIUS server: Set Tunnel-Type to "VLAN". Set Tunnel-Medium-Type to "IEEE-802". Set Tunnel-Private-Group-Id to "my.vlan.10". Designate the VLAN name instead of VLAN ID. Configure the FortiGate: config system interface. edit "my.vlan.10".
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One VLAN ID per user. See Reserved VLAN IDs. To configure dynamic VLAN assignment, you need to: Configure access to the RADIUS server. Create the SSID and enable dynamic VLAN assignment. Create a FortiAP Profile and add the local bridge mode SSID to it. Create the VLAN interfaces and their DHCP servers.
Dynamic port assignment is for non-user ports; think access points, cameras, iot devices. Use NAC for your user ports; think desktop, laptops, kiosk. Reply. junior_it. •. I entered 3 different mac addresses into the DPP I created and created Vlan Policies for each mac address to be assigned to different vlans.
First we need to create a new bridge mode SSID on the Fortigate controller. Next we need to enable dynamic vlan via CLI: config wireles-controller vap. edit DynamicVLAN. set dynamic-vlan enable. end. Next we create the vlans on the Fortigate interface upon which the FortiAPs are connected. We have vlans v1000 and v2000 off the internal interface:
To configure dynamic VLAN assignment, you need to: Configure access to the RADIUS server. Create the SSID and enable dynamic VLAN assignment. Create a FortiAP Profile and add the local bridge mode SSID to it. Create the VLAN interfaces and their DHCP servers. Create security policies to allow communication from the VLAN interfaces to the Internet.
Web Application / API Protection. FortiWeb / FortiWeb Cloud; FortiADC / FortiGSLB; SAAS Security
This video will be helpful to understand and configure basic MAC-based authentication with Dynamic VLAN assignment only to devices that have successfully bee...
Dynamic VLAN assignment without radius. Hi Fortinet Experts, We are working on phasing out our local onsite infrastructure and are going to full cloud, which means our domain controllers and radius will be phased out. Currently, we have our wireless network setup using 802.1x and radius. Because we are phasing out radius we need a new solution ...
We currently have a single SSID "Secure", and users authenticate via RADIUS and are dynamically assigned to various vlans based on their user role. The authentication server is ClearPass, which polls AD for both U/P and AD Group membership. Depending on their AD Group memberships, ClearPass assigns them a user role attribute (ie Student ...
To confirm that the VLAN was assigned as expected: Connect an IP phone to the network. Check the IP address on the phone. The IP address should belong to the voice VLAN. Sniff on the FortiGate incoming interface to see if traffic from the IP phone has the desired VLAN tag. In the example commands above, the voice VLAN was configured as VLAN 100.