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The Blue interface is used for Guest access to the Internet typically through a wireless access point. There are some configuration details that need to be attended to.
You must have three working NICs installed in your IPCop box.
Documentation here:
Login to IPCop SSH as root. “# setup”
Choose Green, Blue, Red
Choose OK to change and assign the free NIC to Blue.
Assign the IP address for this interface that will be the gateway for the guest and subnet.
IP address: 192.168.2.1 Network mask: 255.255.255.0
If you want the Blue interface to suppy DHCP that must be done in the web interface as well as setting authorized IP addresses/MAC addresses to access the RED (Internet) interface.
Use your browser to access https://IP_of_Green_IPCop:445
On the Services tab choose “DHCP Server”. You should now see a Blue interface option.
Tick “Enabled” for the Blue Interface.
Set the start address and end address so they match the IP you set for the Blue Interface in a range that works for you. I set from .66 to .86 so I only had 20 addresses to authorize for access. I left the other fields at default the same as the Green Interface.
Save.
In the web interface Choose Firewall, Blue Access.
For Source IP: add the first IP address of your DHCP range. Tick “Enabled” Click Add.
Repeat this for all IP addresses in the DHCP range.
Only these IP addresses will be able to access the Internet (Red Interface) from the Wireless Access Point you have setup.