I am new to the forum, but I did search for a few days and haven't seen anything like this.
My situation is as follows:
SSG-550M with ScreenOS 6.2.0r7.0
Public IP range (ex. 200.100.50.0/24) - Gateway is 200.100.50.1 - NAT is strictly prohibitted. All devices must have registered, routeable (Public) IP addresses.
I tried to set the Untrust interface as 200.100.50.2 and the Trust interface as 200.100.50.3 but received the overlapping subnet error. I tried the "Set interface [interface] no-subnet-conflict-check" command on both eth0/0 and eth0/2 but apparently it is not a known keyword in this version.
I have also tried to set the eth0/0 as 192.168.1.1 and installed another SSG-550M with its eth0/2 address as 192.168.1.5 and the eth0/0 address as 200.100.50.3. Set the default routes to 192.168.1.1 on the 2nd firewall and 200.100.50.1 on the 1st firewall.
For testing purposes I set both devices to allow ANY address, ANY port and ANY service in and out. No devices behind the firewall can get to the internet. I am not sure, but I would venture to guess that no devices upstream can get to me either.
I would greatly appreceiate any assistance in getting this to work.
Thank you.