231
199
Normally used with the Multi\-cast IP address range (224\&.0\&.0\&.0/4)\&. Specifies that traffic will be sent to the specified net(s) but that no traffic will be received from the net(s)\&.
232
Shorewall should set up the infrastructure to pass packets from this/these address(es) back to themselves\&. This is necessary if hosts in this group use the services of a transparent proxy that is a member of the group or if DNAT is used to send requests originating from this group to a server in the group\&.