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 Implementing Inexpensive Multiple SSID Networks: Part II By Eric Geier
December 4, 2007
Adding the virtual interface(s) The first item on the list is to configure the virtual SSID interface(s):
Figure 1 [below] shows an example of configuring the virtual SSID to be segregated from the main SSID. This is because the virtual interface IP address (192.168.2.1) is on another subnet from the main SSID’s IP address (192.168.1.1).
If you wanted the virtual SSID to be on the same VLAN as the main SSID, (meaning people on the virtual SSID could access the network of the main SSID) you could, for example, enter 192.168.1.2 for the virtual interface IP address. Later, you’ll have to specify the DHCP settings, including the IP address range that matches the IP information you set up here. 4. Click the Save button to save, but not apply your changes.
Configuring the DNS and DHCP settings Now, you must manually configure the DNS and DHCP settings for each virtual interface:
interface=wl0.1 dhcp-option=wl0.1,3,192.168.2.1 dhcp-option=wl0.1,6,192.168.1.1 dhcp-range=wl0.1,192.168.2.100,192.168.2.249,255.255.255.0,1440m
Figure 2: Example of configuring the DNS and DHCP settings.
Keep in mind each virtual SSID requires its own set of code. Additionally, make sure you specify the correct interface number in each set. The wl0.1 refers to the Virtual Interface wl0.1 SSID (seen in the wireless section of DD-WRT); for example if you are setting up a second virtual SSID then its set of code would contain wl0.2, the third would be wl0.3, and so on.
Even when using only one virtual SSID, you should also keep in mind the other variables this code presents: · The IP address in the second line of code should be the address you specified earlier when setting up the virtual interface in the wireless section. · The IP address in the third line of code should be the main or original address of your router which is 192.168.1.1 by default. · The last line of the code specifies (in consecutive order) the following, separated by comas in the code: o Starting IP address of the DHCP addresses, matching the subnet you defined. o Ending IP address of the DHCP addresses, matching the subnet you defined. o Subnet mask. o Client lease time. (in minutes) 3. Click the Save button to save but not apply your changes. Configuring Firewall (VLAN) Settings You also have to manually configure firewall settings for each virtual interface to prevent users on the virtual SSID(s) from accessing the original network:
iptables -I INPUT -i wl0.XXX -m state --state NEW -j logaccept Replace XXX with the virtual interface number shown on the main wireless page of DD-WRT. Note: If you already have specified commands (shown in the Firewall section) click the Edit button which should make your existing commands appear in the commands box. After you make your desired additions/edits in the box, you can click the Save Firewall button as step six instructs.
iptables -I FORWARD -i wl0.XXX -o br0 -j logdrop iptables -I FORWARD -i br0 -o wl0.XXX -j logdrop Replace XXX with the virtual interface number shown on the main wireless page of DD-WRT.
For example, if you have two virtual SSIDs (not counting your main one) you would like to segregate, add the following: (This prevents communication like file sharing, pinging, etc between your first and second virtual SSID.) iptables -I FORWARD -i wl0.1 -o wl0.2 -j logdrop iptables -I FORWARD -i wl0.2 -o wl0.1 -j logdrop When adding your third virtual SSID that you would like to segregate from the others you would add the following two sets of code: (This prevents communication between your third and first virtual SSID) iptables -I FORWARD -i wl0.1 -o wl0.3 -j logdrop iptables -I FORWARD -i wl0.3 -o wl0.1 -j logdrop (This prevents communication between your third and second virtual SSID) iptables -I FORWARD -i wl0.2 -o wl0.3 -j logdrop iptables -I FORWARD -i wl0.3 -o wl0.2 -j logdrop
You’re done; your router should now be broadcasting multiple SSIDs!
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