Hiremember that at the end of ACL there's an implicit deny any. If you want only deny traffic between that network, you must write at the end:access-list 101 permit ip any anybye
In this scenario, I suppose that if you use NAT from network 192.18.2.0 to 192.168.7.0, on SR1 router you configure "ip nat inside" on interface FE0/0.2 and "ip nat outside" on interface Ser0/0. Another important things is the default gateway. You ca...