I'm looking for additional ways to reassure myself none of the computers on my home network has become part of a botnet.
Is there a firewall appliance (i.e. self contained unit) or network monitor appliance with built-in display that shows connection status like netstat, outgoing pop3 mail headers (to detect spambot) plus any suspicious activities? I really don't want to add another dedicated PC for this purpose because of the space it takes up and the amount of maintenance (now I have to run updates and worry about this PC being infected).