Combining WiFi and wired networks with a software switch

Combining WiFi and wired networks with a software switch

FortiAP local bridging (Private cloud-managed AP)

Using bridged FortiAPs to increase scalability

Combining WiFi and wired networks with a software switch

A WiFi network can be combined with a wired LAN so that WiFi and wired clients are on the same subnet. This is a convenient configuration for users. Note that software switches are only available if your FortiGate is in Interface mode.

To create the WiFi and wired LAN configuration, you need to:

• Configure the SSID so that traffic is tunneled to the WiFi controller.
• Configure a software switch interface on the FortiGate unit with the WiFi and internal network interface as members. l Configure Captive Portal security for the software switch interface.

To configure the SSID – web-based manager

1. Go to WiFi & Switch Controller > SSID and select Create New.
2. Enter:

3. Select OK.
4. Go to WiFi & Switch Controller > Managed FortiAPs, select the FortiAP unit for editing.
5. Authorize the FortiAP unit.

The FortiAP unit can carry regular SSIDs in addition to the Bridge SSID.

To configure the SSID – CLI

This example creates a WiFi interface “homenet_if” with SSID “homenet” using WPA-Personal security, passphrase “Fortinet1”.

config wireless-controller vap edit “homenet_if” set vdom “root” set ssid “homenet” set security wpa-personal set passphrase “Fortinet1”

end

config wireless-controller wtp edit FAP22B3U11005354 set admin enable set vaps “homenet_if”

end

To configure the FortiGate software switch – web-based manager

1. Go to Network > Interfaces and select Create New > Interface.
2. Enter:

3. Select OK.

To configure the FortiGate unit – CLI

config system interface edit homenet_nw set ip 172.16.96.32 255.255.255.0 set type switch set security-mode captive-portal set security-groups “Guest-group”

end

config system interface edit homenet_nw set member “homenet_if” “internal” end

FortiAP local bridging (Private cloud-managed AP)

VLAN configuration

If your environment uses VLAN tagging, you assign the SSID to a specific VLAN in the CLI. For example, to assign the homenet_if interface to VLAN 100, enter:

config wireless-controller vap edit “homenet_if” set vlanid 100

end

Additional configuration

The configuration described above provides communication between WiFi and wired LAN users only. To provide access to other networks, create appropriate firewall policies between the software switch and other interfaces.

FortiAP local bridging (Private cloud-managed AP)

A FortiAP unit can provide WiFi access to a LAN, even when the wireless controller is located remotely. This configuration is useful for the following situations:

• Installations where the WiFI controller is remote and most of the traffic is local or uses the local Internet gateway l Wireless-PCI compliance with remote WiFi controller
• Telecommuting, where the FortiAP unit has the WiFi controller IP address pre-configured and broadcasts the office SSID in the user’s home or hotel room. In this case, data is sent in the wireless tunnel across the Internet to the office and you should enable encryption using DTLS.

FortiAP local bridging (Private cloud-managed AP)

Remotely-managed FortiAP providing WiFi access to local network

On the remote FortiGate wireless controller, the WiFi SSID is created with the Bridge with FortiAP Interface option selected. In this mode, no IP addresses are configured. The WiFi and Ethernet interfaces on the FortiAP behave as a switch. WiFi client devices obtain IP addresses from the same DHCP server as wired devices on the LAN.

The local bridge feature cannot be used in conjunction with Wireless Mesh features.

Block-Intra-SSID Traffic is available in Bridge mode. This is useful in hotspotdeployments managed by a central FortiGate, but would also be useful in cloud deployments. Previously, this was only supported in Tunnel mode.

To configure a FortiAP local bridge – web-based manager

1. Go to WiFi & Switch Controller > SSID and select Create New > SSID.
2. Enter:

3. Select OK.
4. Go to WiFi & Switch Controller > Managed FortiAPs and select the FortiAP unit for editing.
5. Authorize the FortiAP unit.

The FortiAP unit can carry regular SSIDs in addition to the Bridge SSID.

SSID configured for local bridge operation

To configure a FortiAP local bridge – CLI

This example creates a WiFi interface “branchbridge” with SSID “LANbridge” using WPA-Personal security, passphrase “Fortinet1”.

config wireless-controller vap edit “branchbridge” set vdom “root” set ssid “LANbridge” set local-bridging enable set security wpa-personal set passphrase “Fortinet1”

end

config wireless-controller wtp edit FAP22B3U11005354 set admin enable set vaps “branchbridge” end

Using bridged FortiAPs to increase scalability

Continued FortiAP operation when WiFi controller connection is down

The wireless controller, or the connection to it, might occasionally become unavailable. During such an outage, clients already associated with a bridge mode FortiAP unit continue to have access to the WiFi and wired networks. Optionally, the FortiAP unit can also continue to authenticate users if the SSID meets these conditions:

• Traffic Mode is Local bridge with FortiAP’s Interface.

In this mode, the FortiAP unit does not send traffic back to the wireless controller.

• Security Mode is WPA2 Personal.

These modes do not require the user database. In WPA2 Personal authentication, all clients use the same preshared key which is known to the FortiAP unit.

• Allow New WiFi Client Connections When Controller is down is enabled. This field is available only if the other conditions have been met.

The “LANbridge” SSID example would be configured like this in the CLI:

config wireless-controller vap edit “branchbridge” set vdom “root” set ssid “LANbridge” set local-bridging enable set security wpa-personal set passphrase “Fortinet1” set local-authentication enable

end

Using bridged FortiAPs to increase scalability

The FortiGate wireless controller can support more FortiAP units in local bridge mode than in the normal mode. But this is only true if you configure some of your FortiAP units to operate in remote mode, which supports only local bridge mode SSIDs.

The Managed FortAP page (WiFi & Switch Controller > Managed FortiAPs) shows at the top right the current number of Managed FortiAPs and the maximum number that can be managed, “5/64” for example. The maximum number, however, is true only if all FortiAP units operate in remote mode. For more detailed information, consult the Maximum Values Table. For each FortiGate model, there are two maximum values for managed FortiAP units: the total number of FortiAPs and the number of FortiAPs that can operate in normal mode.

Using bridged FortiAPs to increase scalability

To configure FortiAP units for remote mode operation

1. Create at least one SSID with Traffic Mode set to Local bridge with FortiAP’s Interface.
2. Create a custom AP profile that includes only local bridge SSIDs.
3. Configure each managed FortiAP unit to use the custom AP profile. You also need to set the FortiAP unit’s wtpmode to remote, which is possible only in the CLI. The following example uses the CLI both to set wtp-mode and select the custom AP profile:

config wireless-controller wtp edit FAP22B3U11005354 set wtp-mode remote set wtp-profile 220B_bridge end