Noob question: Why do my separate networks see each other when they should not?
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 So I have a WAN, LAN, and WLAN. Clients from my LAN see clients on my WLAN, and vice-versa. This is bad. Is it because automatic outbound NAT rule generation is enabled by default? Is that what bridges the two networks? 
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 what do you mean by "they see each other". how do you test this? 
 AoN doesn't bridge anything.
 it defines how traffic is NATed on the various interfaces.
 –> if there are no AoN rules you have a purely routed setup.
 rules to define from where to where one can communicate are on the firewall rules page.
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 Your firewall rules are probably allowing it. 
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 If you have rules allow any any, then they will see each other. 
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