Routing

I have a problem seeing certain IP's in my own subnet assigned by the ISP, looking for help on how I can get it to work. I have my SuSE Linux workstation with 192.168.1.25 behind a NAT router which is the default gateway for the workstation at 192.168.1.1. Now, I have a second IP in my wks within the subnet assigned by the ISP let's say 1.2.3.43/29, this is to allow hosting of some services, no firewall in place, yet. I have another Linux server at 1.2.3.44/29. I cannot see the other Linux server from my workstation. Perhaps routing can accomplish this for me, but I'm totally stupid on how to set that up, can someone suggest? -- Robert