Scope:
Applies to all Barracuda Web Filter appliances on all versions of firmware.
Answer:
Onavo's servers are hosted on Amazon EC2, currently in the United States and you can find the Amazon EC2 servers IP address range in the following link:
https://forums.aws.amazon.com/ann.jspa?annID=1701
In order to be able to block the Onavo application you need to to the followings:
1- Install the application on an IPAD.
2- Set up proxy to the web filter on the IPAD.
3- Open settings > VPN
4- From the list of the VPN connections selected "Onavo" and opened the "!" sign which open the Onavo VPN configuration.
5- According to your location , it shows "vpn-<your city>.v.onavo.com" and server IP <x.x.x.x>
6- Blocked the subnet for the server IP with the netmask of 255.255.255.0 under block accept > ip block / exempt page and this will block the servers which Onavo is using to send your traffic.
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