Hello.
I'm running Sophos UTM9 Home Edition on a small dedicated virtual machine where as the host (VMware ESXi) is connected to two physical network cards, offering 4 virtual ones to Sophos (green, orange, dyn, red):
green: eth0, 192.168.123.0/24 (no dhcp)
orange: eth1: 192.168.124.0/24 (no dhcp)
red: eth2: public IP (gateway to ISP)
The 'dyn' network is a static route which leads to a legacy pfSense gateway server running a DHCP for dynamic clients, ip range is 192.168.125.0/24.
Within the green network, I got 6 machines, IP addresses statically assigned. Within the dmz I currently got nothing and in the dyn network, there are currently 10 devices (phones, laptops), but since they use the pfSense as a gateway, I don't think Sophos can actually see them?
Here's my problem:
Today I received an email from the Sophos UTM that my license for Home use has been exceeded by over 200 machines. Along with the email, there was a list of IP addresses which have been blocked:
192.168.124.1
192.168.124.2
192.168.124.3
192.168.124.4
192.168.124.5
192.168.124.6
...
The thing is: There are no devices having those IP addresses, no devices in that network (dmz) anyway and definitely not more than 20 devices using Sophos as their gateway. Where do these IP devices come from? What exactly did Sophos detect here?
When I run an ip scan, I also get weird results:
(ip scan on range 192.168.123.1 - 192.168.125.255, from green to dyn)
192.168.123.1
192.168.123.2
192.168.123.5
192.168.123.10
192.168.123.11
192.168.123.35
192.168.124.1
192.168.124.2
192.168.124.3
192.168.124.4
192.168.124.5
...
I can clearly see only my available devices within the green network, but as soon as it hits the dmz, my ip scanner reports that every IP address in that range is online.
What the hell could cause this?
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