iptables --flush confusion

[simon-tlug-GaisZHhRk3c at public.gmane.org]

I have a router set up to do NAT that's using iptables, with 
net.ipv4.ip_forward=1, and I'm somewhat confused why when I do an 
'iptables --flush', I'm no longer able to connect to it from another 
device that is on the same subnet that the 'wan' interface is on.

Does anyone know why this is? Am I misunderstanding what it is that 
--flush does, or some other basic networking concept?

Cheers,
spd
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