CSX400 Configuration with QuickSETCSX400 and CSX400-DC User’s Guide 103Source IP — The Source IP field displays the IP address of the source device accorded thepermissions set in the permissions field. To set permissions for a source device, place the cursor inthe Source IP field and type the IP address of the source that you wish to set permissions.Source Mask — Displays the mask for the Source IP address specified in the Source IP field. Toset the mask for the specified source IP address, place the cursor in the Source Mask field and typethe mask.The default Mask for both the source and destination addresses is 0.0.0.0, which masks the entireaddress, causing all addresses to match the filter. In other words, the default access control listallows all traffic to pass. Entering a mask of 255.255.255.255 causes only packets matching theexact address you have entered to match the filter.For a Class C address, entering a mask of 255.255.255.0 causes packets with the same class Csubnet as the IP address to match, thereby causing the access control filter to apply to all hosts onthis particular subnet.Dest IP — The Dest IP field displays the IP address of the destination device accorded thepermissions set in the permissions field. To set permissions for a certain destination device, placethe cursor in the Dest IP field and type the IP address of the destination for which you wish to setpermissions.Dest Mask — Displays the mask for the Destination IP address specified in the Dest IP field. Toset the mask for the specified destination IP address, place the cursor in the Dest Mask field andtype the mask.Protocol — Use this pull-down list to select the upper layer protocol that you want to apply to theaccess control filter. Each access control filter can apply to traffic for all protocols included in theTCP/IP suite, or just to traffic for a single protocol.Permission — Use this pull-down list to set the permissions for the specified control filter.Options for this field include permit, deny, permit bi-directional, or deny bi-directional. Choosingpermit allows the specified packets to be forwarded, while choosing deny blocks the specifiedpackets. Choosing permit bi-directional or deny bi-directional either permits or denies traffic toand from a specified source or destination.
