NAT problem

can somebody help me how i can find out if
my office network is doin NAT or not..........
i ve a dsl connection .
One cable from ethernet interface of router is inserted
into switch having three lans.
1. 192.168.2.X
2. 192.168.5.X
3 All Global IP

No.1 network is for data and No.2 is for data.
I ve my pc on 192.168.2.52 with 192.168.2.1 as server.

My server has three NIC with addresses
1. 192.168.2.1
2. 192.168.5.1
3 203.82.52.251

With inter-networking enabled within the three NIC cards.
I was wondering how my pc will be recognized by other machines on internet.
As i think that NAT is diabled here.
Thnx in advance.

If you can access the internet from your PCs that have 192 addresses then you definitely have NAT going on somewhere since these are private addresses that cannot exist on the internet. From your description it sounds like NAT might be running on your server. What operating system is it running?

well my server is running Feodra Core 3.
I have a switch with three VLANS. One of the VLAN has all global IPs.
My server has one global IP with two private IP i.e. 192.168.2.1 and
192.168.5.1.
My PC's default gateway is 192.168.2.1.