The other four are each connected to protected subnets. 1.2 C-AD Protected Subnets. The C-AD firewall rules are simplier in that the 4 protected subnets block no traffic between themselves nor to the Internet. These protocols cannot cross the firewall, however, they can exist within each subnet. After the user enters the target computer, the firewall computer becomes transparent.
All transactions now occur between the user's workstation and the target computer.
Detailed description of SKEY and SecurID access through the firewall . After logging into a protected subnet computer, you may find that X Windows does not display. The firewall may cause two Unix environmental variables to be improperly set. Some Cable modem systems have the port blocked which is used to access X-Window. Check the documentation for your X-window server for details.