I am working on a firewall for a company in seattle. They do not hav any
UNIX hosts on their network. They are going to be using Chameleon for a
TCP/IP stack. They will have an ISDN connection to the Internet. A Cisco
router will be employed between their network and the ISDN line.
I would like to set up a UNIX host between their network and the Cisco
router. This machine will have to act as a gateway as well.
The question I have is, can I configure this host to only route packets of
users that have logged in to it?
To put it another way, I am concerned that once I set up this machine to
function as both a host and a gateway, it will route any incoming packets
to the CIsco router. This will defeat the purpose of using an
intermediary host as a firewall. I would appreciate any feedback. Thanks!