Common Internet File System (CIFS) is one type of application traffic that requires a second application-specific virtual server (optimized application) on the receiving side of the iSession connection. Bidirectional CIFS application traffic requires that both client and server virtual servers be created on the BIG-IP WOMs on both sides of the WAN. When you configure BIG-IP WOM to optimize CIFS traffic in a one-arm deployment, you must manually create these virtual servers.
In a bridge or routed deployment, the Quick Start screen automatically creates these optimized applications when you select and apply them. In a one-arm deployment, you specify only one VLAN, that is, the WAN VLAN. The BIG-IP WOM system cannot determine whether to create the optimized application on this VLAN for inbound or outbound traffic, so you must create both of them manually.
In a one-arm deployment, to optimize CIFS traffic bidirectionally across the WAN, you must manually create custom optimized applications (virtual servers) for both outbound (client) and inbound (server) CIFS traffic. You can also create a virtual server to prevent CIFS traffic from using NetBIOS service port 139, thus forcing CIFS traffic to use port 445.