I have no interest in QOS for incoming mail so I have the rule(s) in firewall.
I have the rule in both input and forward (output is just set to allow all). But, I’m not sure which combination of parts(int, sourceIP, destIP, port) should be where? I understand the fundamentals but I’m still wrapping my head around what to put in which chain.
I have another question just trying to look up:
eth0 is connected to my cable modem, simple.
eth2 is connected to my dsl modem, no as simple because it also has another interface ppp0, which can be used in NAT, FW, etc.
I’m not sure where I have to include ppp0 in a rule or two, or a bond or bridge to ensure it works simply like eth0?