Stratix 5700 switch config problem

KellyCorey

Member
Join Date
Mar 2013
Location
Maryland
Posts
3
Hello,

I am at a deadend using Stratix 5700 to connect two subnets together. Needing some fresh eyes.

Basically,

I have 1 PLC (IP address is 192.168.1.1), default gateway 192.168.1.99. Stratix switch IP is 192.168.1.10. subnet 255.255.255.0

On the public network side, I have a catalyst switch at 192.168.41.1, subnet 255.255.255.0. The translated address for the PLC on the "41" subnet is 192.168.41.101.

The VLAN is setup as default from the factory. I did the express setup to fill in the IP address for the switch, the gateway is set at 192.168.1.99. Stratix switch 192.168.1.10. I did not configure any ports, smart ports or any other configuration. I then configured the NAT.

Private to Public - 192.168.1.1 to 192.168.41.101

Gateway transaltion - 192.168.41.1 to 192.168.1.99

I did not configure any Public to Private.

The issue is I can not ping the catalyst switch from inside the NAT. From outside the NAT i cannot connect to the PLC.

Is there something else I need to configured? I saw a note somewhere about VLAN trunking and smart ports configuration , auto negotiation. Where do i change VLAN trunking or smart ports (automation setting?). I followed the NAT quickstart and it did not mention any of these other settings.

Please advise.

TIA
 
Hi and Welcome to the Forum!

Have a read of this, if you have a TechConnect contract...

554727 - Stratix 5700: NAT(Network Address Translation) Configuration
Access Level: TechConnect

There might be one or two things in there that you may have overlooked?

Regards,
George
 
On the 5700 it's a 1:1 NAT and does not work like it would on a normal Catalyst switch. If you are only translating the PLC you don't need a gateway translation but you do need a private to public entry as well as a public to private entry for each device you need to translate. If you want to NAT an entire range of IPs its a little different.

Also your IP in each translation direction needs to be unique on that subnet. You can also do a layer 3 VLAN routing in the 5700 using console. IMHO the document listed above has good intentions but leaves much to be desired IMHO.i have some others posts on 5700 configs in the forum if you do a search.
 
Thank you everyone for your help.

Basically, I just need to translate PLC and a few other devices on the private network side (192.168.1.xxx) to (192.168.41.xxx). The "41" subnet is our local area network for control systems and have several other nodes. The private subnet is only for one production line with several HMIs and AC drives.

I always thought that NAT is the way to do this. However, if all i need is private to public and public to private entries, should I set up the plc and its corresponding mapping in both tables? and similarly for the laptop?

If I then need to use RSlogix5000 to access this PLC on the public side, I would map a path using the public side ip?

Sorry for the questions, but setting up comm has always been a challenge for me.
 
Kelly,

You need to use the NAT funcionality of the Stratix 5700.

In the switch which is in the 192.168.1.xxx subnet you need to configure the switch to have a Private to Public table like this:

192.168.1.1 to 10.10.10.1

and a Public to Private table like this:
10.10.10.1 to 192.168.1.1

In the switch which is in the 192.168.41.xxx subnet you need to configure the switch to have a Ptorivate to Public table like this:

192.168.41.1 to 10.10.10.1

and a Public to Private table like this:

10.10.10.1 to 192.168.41.1

(Obviously all of these IP addresses are just examples, the exact numbers you use may vary.)

The important part to understand is that you will actually need 3 different subnets (192.168.1.xxx, 192.168.41.xxx and another (could be 10.10.10.xxx or 192.168.2.xxx for example))

I hope this helps.
Ian
 
Hi,

Thank you for all your help I was able to get the PLC to appear on the public side. That is private IP = 192.168.1.1 (PLC) , Public IP= 192.168.41.2. I can now ping 192.168.41.2 on the public side. However, I am still not able to use RSLinx to connect and go online with this PLC. When RSlinx loads, it will show the node as 192.168.1.1 not 192.168.41.2 eventhough the laptop is on the public side. When trying to connect via RSlogix5000, not able to connect.

Please help. I am not sure what is missing? I am able to ping the node on the public side.
 

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