I received an automated email from my ASG this morning, warning me that I had reached 90% of the 50-client limit on my free Home license. I was somewhat taken aback by this, as I know that we have less than a couple of dozen networked devices in our household.
Sure enough, when I checked the list of active addresses in WebAdmin, I found 20 addresses that I know belong to us, but also another 25 that don't belong here.
These "rogue" IP addresses are all in the 192.168.1.0/24 range, a subnet that I have assigned to a separate network for use by house guests. But we have no house guests right now, and the attached WAP is disabled, so they have not come in via that route. Nor should they be the result of spoofed external connections, as I have Spoof Protection set to Normal.
What I suspect is happening is that my Torrent client is trying to establish connections to these addresses due to ill-configured remote peers, and the ASG is picking up on the traffic and adding them to my licensed client list as it directs the traffic out onto my guest network, despite the fact that the destination address has never actually appeared on that network. If correct, this seems like a somewhat bass-ackwards way to count "clients". Surely clients should only be counted if they actually exist, not merely if another machine goes looking for them?
Has anyone experienced this sort of behavior before, or have any other ideas what might be causing it or how to avoid it? In the short term, I'm going to configure my guest network to something less commonly used by consumer-grade gear - something in the 10's, perhaps - to reduce the likelihood of it matching any spurious traffic from my torrent client.
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