Guest WLAN provides internet access to your network members. It also provides firewall security rules to isolate your guest network from the rest. This recipe contains information provided by our forums members and one blogger as showed below:
The changes below assume an OpenWrt default configuration, the relevant files are:
/etc/config/network and define a new
The new network interface will have to be configured as a bridge if your wireless network has multiple radios and access points, and you wish to connect more than one to the guest network.
In /etc/config/wireless, define a new, second wifi-iface section by copying the existing one and change its network option to point to the newly created interface section.
option 'device' '…' you should put the device listed in your 'wifi-device' section. For example, if your 'wifi-device' says
config 'wifi-device' 'wifi0' then the wifi-iface section should say
option 'device' 'wifi0'
Note: Your hardware may not be capable of this. For example, open source b43 driver for Broadcome hardware cannot have multiple SSIDs. You need to use the proprietary wl driver by Broadcom (with 2.6 kernel) - currently, you need to build the images yourself. — sup 2012/05/12 20:22
In order to support DHCP on 'guest' wireless, a new
dhcp pool must be defined in
/etc/config/firewall and add new zone section covering the 'guest' interface, allow internet, DNS and DHCP to guests:
— sartan 2011/03/17 05:45
I created this small set of firewall rules to completely isolate guests on the guest SSID. I had some devices that only worked with WEP or no authentication at all. WEP doesn't like to run on .11n devices in HT mode, so the only option was a wide-open SSID. I also didn't want my neighbors to quickly steal my internet… This firewall config will only allow specific, known source MACs to connect to the internet, with zero access to the rest of the network.
/etc/config/firewall and add new zone section covering the 'guest' interface, allow SSH, DNS and DHCP to guests, allow only specific source MAC addresses out to the WAN, drop broadcast traffic and deny the rest of orders:
This is completely optional, but advised. Install package wshaper:
opkg install wshaper
config wshaper 'settings'
option network 'guest'
option downlink '64'
option uplink '512'
uplink options are maximal limits, but in practice the speed will be slightly lower as wshaper also tries to prioritize traffic (so that the network stays responsive even when someone downloads a huge file - there are also wshaper options that can control this). The units are kbits.
Also note: The
uplink limits are reversed from what one might expect, as the data is flowing in the opposite direction from wshaper's usual (wan) interface.
- Enable the new wireless network
- Restart the firewall
- Restart the DHCP service
- Start traffic shaping
- Make traffic shaping permanent
If you don't get an IP from DHCP check if you listen to the interface.
doc/recipes/guest-wlan.txt · Last modified: 2013/09/05 16:10 by cor