Vision software sending UDP packets on port 3956

[tomwp]

When LabVIEW loads the vision module it starts sending UDP packets on port 3956.  I understand that these packets are being broadcast in order to find GigE cameras, however there is a function in LabVIEW to poll for GigE cameras so why is it constantly polling?  I am querying this because our company network administrator is unhappy that machines are broadcasting UDP packets.  I know they are 16bytes and only every few second, but Im not the network administrator!!


Thanks for your help,

Tom

[JonBowers]

Hi Tom,

Are the UDP packets always on port 3956? When you say LabVIEW loads the Vision module do mean during the start up of LabVIEW or when you load a VI that uses Vision or something like the Vision Assistant? How are you monitoring the UDP packets?

Regards

Jon Bowers 
Applications Eingineer  
NI UK & Ireland

[tomwp]

Hi Jon,

It would appear that the packets are only on port 3956.  Also they only occur when a VI using the vision module is loaded.  The packets have been monitored using WireShark
Thanks,

Tom

[JonBowers]

Hi again Tom,

could you send me a copy of the VI you are using so I can test it here. Is it when you run the VI or when it is loaded into memory?

Regards

Jon Bowers  
Applications Engineer
NI UK & Ireland

[Telecentric]

Did you find a solution to this?  We are having the same issue, and our Network admin is not too happy as well.

[cpcadmin]

Greetings, 

                I am an admin and I can tell you I'm not happy about that at all.  It should not be a default behavior.  I don't know any admin that would want their network flooded with packets like that.

[Mark_Yedinak]

---

@cpcadmin wrote:

Greetings, 

                I am an admin and I can tell you I'm not happy about that at all.  It should not be a default behavior.  I don't know any admin that would want their network flooded with packets like that.

---

If the statement above is correct that the packet is only broadcast every few seconds this is hardly flooding th enetwork. Any Windows PC spews lots more junk than that. While I agree that there should be a way to disable the broadcast packets as an admin I would not be too bothered by a device sending a packet every few seconds. My PC sitting idle sent 181 packets in 11 seconds. Three or four UDP broadcasts added to this is certainly not that significant.

[cpcadmin]

It is as exactly as you said. Every PC/device is sending unicasts and broadcasts.  It's their combined numbers that can make it a problem.  I'm disappointed when I see a device's default behavoir set to broadcast, I get more concerned the more devices I have on my LAN that act that way.  IPv6 will help but we are not yet ready for that internally. I"m guessing most aren't either.

Nice tag BTW,  One of my guilty pleasures.

[Mark_Yedinak]

---

@cpcadmin wrote:

Nice tag BTW,  One of my guilty pleasures.

---

Sailing or boating? I race sailboats on Lake Michigan. I crew for a 42' boat.