what to look for during possible latency

asked 2020-06-30 12:34:51 +0000

i work as a support engineer and i was asked to look into some network problems on our system. As i have no real knowledge to speak of when it comes to network latency issues ( if it is the network ) i might require some help.

The setup is as followed, i have 3 different camera's hooked up to a pc. All go first trough a netgear switch and enter the pc trough a Ethernet-to-usb dongle ( as by design ). Now when all 3 camera's are on the first one has a response time of about 15seconds when send a command to capture.. that should be a second max. When i disconnect camera 2, the first one works fine.

Now they think it is something with the network, is that something wireshark can be used for? If yes, that what should i be looking for?

Thank you for your time. MrC.

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Have you documented the config?
Are these IP cameras? Are they using DHCP or static addresses?

Chuckc gravatar imageChuckc ( 2020-06-30 12:57:12 +0000 )edit

these are specialized camera's used for viewing samples under a electron microscope.. The image data goes trough a fiber, but the communication goes trough Ethernet. They all have a static address.

MrC_TheSecond gravatar imageMrC_TheSecond ( 2020-06-30 13:02:46 +0000 )edit

Have you made a capture on the PC to see activity during the long response time?

Chuckc gravatar imageChuckc ( 2020-06-30 16:40:25 +0000 )edit

No not yet, sadly enough they decided that the work around of disabling one of the camera's was good enough for now, as to not slow down production. But since there is more hooked up to the computer than only the 3 camera's i expect a lot of data being transferred. What should i look for when i get the time to actually test it? filter on TCP? Or filter on only the IP of the camera that is slow?

MrC_TheSecond gravatar imageMrC_TheSecond ( 2020-07-02 11:57:30 +0000 )edit

Get a baseline for what normal is.
"All go first trough a netgear switch"
If everything is on the same switch, start at the bottom (ARP) and work your way up the stack.
Does the PC initiate the connection? Is it TCP or UDP?

Chuckc gravatar imageChuckc ( 2020-07-02 14:33:17 +0000 )edit