Ethernet and Windows Firewall

Hello

I need to know what Windows Firewall rules must be defined for TestStand/CVI see the ARP protocol. We see nothing, no ethernet traffic.

I have a system (Army Gold Master 7, using TestStand and CVI) who has "standard" Government firewall rules We strive to communicate by Ethernet to specialized devices and we see no traffic unless disable us the firewall. We are not on the internet (not allowed by gov). The specialized devices send a broadcast request for IP but the software it never sees.

I added (incoming and outgoing) rules to allow traffic to and from my application (CVI app that does a lot of TestStand active X calls). In the logs I saw something on cviproxy so I put rules to allow that. I've set allow rules for TestStand Runtime engine. I also disabled Windows defender.

Any suggestions? BTW, we will not disable the firewall once it is deployed.

Thank you

Hey Joe,

I did some checking, and generally, CVI does not implement itself - treatment rather ARP packet, it uses Windows built in functionality to receive ARP packets and assign IP addresses. ARP is contained in the Protocol Ethernet himself and is at a lower level than the concept of ports, so that Windows Firewall cannot directly block ARP packets.

Your software CVI aims to process ARP packets in some way, or are you just wanting to communicate with devices via Ethernet? If it's the last, then the assignment of intellectual property should arrive outside the CVI and regarding the CVI you must only make sure that the correct port has been opened for communication with the specialized unit. This port number would be depends on the configuration of the device itself.

When you disable the firewall and are able to communicate with the device, how is the appliance gets its IP address? For example, it is automatically assigned by Windows or your router (with DHCP) or it has a static IP address assigned to him? It is possible that the IP address is assigned, but given that the specific communication port is blocked by the firewall, the communication can occur.

I hope this helps a little, and if you can give us the answers to these questions, we can provide I hope to better understand the situation.

Tags: NI Software

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