Trusted Extensions supports several methods for routing communications between networks. You can set up routes that enforce the degree of security that your site's security policy requires.
For example, sites can restrict communications outside the local network to a single label. This label is applied to publicly available information. Labels such as UNCLASSIFIED or PUBLIC can indicate public information. To enforce the restriction, these sites add the gateway's network interface that is connected to the external network to a single-label template. For more details about TCP/IP and routing, see the following:
netcfg(1M) man page