My Cisco Router 837 have two virtual ethernet interfaces, ethernet 0 and ethernet 2, and more four physical fastethernets. When I configure the two interfaces, one as 192.168.2.1 and other as 192.168.4.2, my server ERP loses connectivity with IP 192.168.2.1 (ERP application have 192.168.1.120 IP address). Could you tell me what is happening? I think that Cisco 837 segments two ports at each network ( 192.168.2.1 and 192.168.4.2). What am I supposed to do to have the communication between the two networks and my erp doesn't lose the communication as well?