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I recently installed redhat 7.3 really for the sole purpose of the included firewall but unfortunately it doesn't work.
I installed using the gui and gave eth1 (internal) the address of 192.168.0.1 netmask 255.255.255.0 and eth0 (external ISP) dhcp, this receives the address 18.104.22.168 from the ISP. One of the hosts on my local internal net has the address of 192.168.0.50 and I am able to ping it from the linux server. Similarly I am able to ping the both internal and external interfaces on the linux server from my internal host 192.168.0.50 but I can get no connectiviy any further than the xternal (isp) interface eth0 from my local host 192.168.0.50.
I do have internet connectivity from the linux server (hence this email, but cannot seem to route correctly through the firewall with any protocols.
I did the initial configuration using lokkit and have tried all three levels of security using this facility with not effect. (sorry for the length of this message but better more infor than less)
I had not intended to get involved with IPHAINS or IPTABLES until I had the basic system running and some considerable knowledge under my belt, and really was led to believe this comfiguration I had completed should have been sufficient.