So I need to NAT IP 192.168.0.200 (it will be the Gateway) on a Port. Then I have to plug a Router into that port. And finally, connect PLC with IP address 192.168.0.x to the router.

Am I right?

You have to Network Address Translate (NAT) the PLC address [not gateway address]. This NAT will be performed by the Internet facing router/firewall and will be transparent to other network elements. 

http://www.cisco.com/c/en/us/support/docs/ip/network-address-translation-nat/13772-12.html

Rais.

I finally did NAT to that IP and it is working.

Thank you for your support.

I have not connected the PLC yet. I need to set up the network before.

Since I don't know the requirements, I have not bought any router yet. I wanted to be sure that I can do it and then I will get everything I need.

Hello

I need to setup to VLAN inside a network.
I have a network with this gateway 144.146.18.1, a DNS server 144.146.18.14 and a mask 255.255.0.0

IPs are assigned via DHCP.

Since I don't know the requirements, I have not bought any router yet. I wanted to be sure that I can do it and then I will get everything I need.

Since you say you don't the hardware - can you tell us what actually you do have currently running

res
Paul

I have the switches running and I have the PLC without connection.

Hello

sill not sure on what it is your asking - it sounds like youhave dual wan links and wish to communicate between them from a source Vlan or that you have two L3 vlans and wish the connect between them?

Maybe you could post a simple topology to help?

res

paul

Hello,

I have a complete network working (servers, desktops,switches, hubs...) under Star Topology.

Gateway is 144.146.18.1, DNS Server is 144.146.18.14 and IPs are automatically assigned by DHCP server from 144.146.18.50 to 144.146.18.200

And I have found a PLC that should be connected to the internet with IP 192.168.0.21 and Gateway 192.168.0.200. PLC settings can not be changed. It is connected to one of our switches (Cisco SG200-26 26-port Gigabit Smart Switch).

So, what do I really need to do in order to give internet access to this PLC without modifying PLC settings?

Thank you in advance

Hi;

Please review my first comment, you need a Router with internet connection. If PLC gateway cannot change then your Router ip address should be 192.168.0.200 on LAN side & then enable NAT for 192.168.0.21 IP Address or more.

E.g: RTR:

Int g0/0

  Description ISP Link for Internet

  ip add X.X.X.X

  ip nat outside

  no shut

Int g0/1

 Description LAN – PLC

 ip add 192.168.0.200

 ip nat inside

 no shut

access-list 10 permit host 192.168.0.21

ip nat inside source list 10 interface g0/0 overload

Thanks & Best regards;

So, I have a Cisco 800 Series Router. A firewall connected to that Router and all the servers, switches connected to that firewall.

Your suggestion is to connect PLC directly to that router?

Also, I will have to change Router IP address to 192.168.0.200. isn't it?

Hi Jorgen;

Can you share you complete topology and your requirement. With half information no body can suggest or troubleshoot your issue.

Thanks & Best regards;

Hello

And I need to connect a PLC which has a default gateway like this 192.168.0.200 and a static IP. I need to give internet access to this PLC

It seems like you have this PLC device connecting to "another " device probably a rtr and you wish to give this internet access without changing it addressing.

So you either need to change the addressing of the PLC device to a routable one or as stated by others apply some network translation as the 192.168.x.x is not a routable Internet ip address.

If 192.168.0.200 device seems to be performing routing , So apart from providing a default gateway for the PLC what else is it used for?

If this rtr is the same device connecting upstream towards the gateway  144.146.18.1, then I simple nat statement on this rtr would be applicable to provide internet access to the PLC device.

But I am not clear how your physical network setup is, Hence why I previously stated, posting a simple topology to help in the resolution of your issue

res

Paul