# # pass ack packets (ie established connection) # pass in proto tcp from 10.1.0.0/16 port = 23 to 10.2.0.0/16 flags A/A pass out proto tcp from 10.1.0.0/16 port = 23 to 10.2.0.0/16 flags A/A # # block incoming connection requests to my internal network from the big bad # internet. # block in on le0 proto tcp from any to 10.1.0.0/16 flags S/SA # to block the replies: block out on le0 proto tcp from 10.1.0.0 to any flags SA/SA