I want to create a rule that allows anyone on eth1 to access port 80. Can UFW do this or should I go back to using Shorewall?
To clarify: this is a capabilties question, can ufw handle interfaces as a target?
I finally read the man page:
By default, ufw will apply rules to all available interfaces. To limit this, specify DIRECTION on INTERFACE, where DIRECTION is one of in or out (interface aliases are not supported). For example, to allow all new incoming http connections on eth0, use: ufw allow in on eth0 to any port 80 proto tcp
To elaborate a little the answer is yes, ufw can use the interface as a target. My particular rule looked like this:
ufw allow in on eth1 to [eth1 ip addr] port 80 proto tcp
Yes, if eth1 is just a normal interface with its own IP address (and that IP address is what you're trying to grant access to):
ufw allow from any to [eth1 ip addr] port 80
But if there's anything more complicated than that, then we need more info about how this system is set up.