That was one of the concerns that I had ... and Greg also raised it as a
potential issue. However, it's not a problem or risk.
The "second channel" that is broadcast is totally independent of the
primary secured, home network channel. It's really a Comcast owned and
controlled connection and has nothing to do with your home network. I
confirmed, both with Comcast and on my computer that the IP addresses
are different. I checked our reported IP address on the primary,
secured network, then disconnected from it, connected to the second
"XFINITYWiFi" signal and it reported a totally different IP.
I think there is a lot of confusion about this, as I was initially when
I received the email from Comcast announcing and explaining this new
feature/service. Again, people are *not* able to sign onto your home
network and it isn't "exposed". The purpose of the Comcast/Xfinity
owned and controlled signal is to eventually make your whole area, town
and state an Xfinity "hotspot".
You can opt out of having your home router having the second channel
capability. At first I was inclined to do that because I really didn't
understand what it was for but now that I do, I'll leave it. There's no
security risk to the regular connection.
It is also only accessible to Comcast customers. If you don't have a
Comcast account, you can't use it.
Let's hope Comcast never gets their wires crossed.