Eicon Networks DIVA LAN ISDN - Manual (Page 133)

Chapter Nine: Advanced Installations IP filters 133
When done, the filter stack should look like this:
Allowing incoming traffic only from a specific network
This example shows how to allow the DIVA LAN ISDN Modem to only receive incoming data from a specific
network (112.111.212.0) on the Internet. Data from all other networks is dropped. However, outgoing traffic is
not affected.
This requires defining two filters. Since these filters are applied against data from the Internet, they are defined
for the ISP profile.
1st filter
Define the 1st filter to forward only incoming traffic from 112.111.212.0. Place this filter in the third position
in the stack.
2nd filter
Define the 2nd filter to forward all outgoing traffic. The easiest way to do this is to edit the existing filter that is
set to “Forward all datagrams being sent from anywhere that contain any protocol.” Change it to “Forward
outgoing datagrams being sent from anywhere that contain any protocol.”