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Does EN104- Hub learn which IP Adress is on which Port?
We want to use an EN104 Hub to monitor our network traffic and analyze the packages with Wireshark. We connected the hub in between two network devices and connected one laptop with the hub so that ...
A Short Update on that Topic,
we figured out that he system works properly when we're not using DHCP given Adresses but use adresses that are fixed in all the devices that are connected to the Hub.
With that he is working correctly. If we use devices that have adresses given by DHCP it stops working as a HUB uncontrollably, sometimes it's working for an hour, sometimes more and most times less than. He's still trasmitting the data, but not to all devices like it should do.
The topic can be closed, we found a solution.
Thanks to all contributors.
Hello JohnRo,
Thank you for your answer. Basically you told me what i thought a normal Hub would work like.
But that is not what we were seeing. After one day of working perfectly fine, the Hub does not send the Data to all connected machines anymore. Like i said, it looked as if it was learning which machine is on which Port.
In the meantime, we figured out that we could make the system work again when we change the IP Adress on that laptop to another one that was not connected to that Hub so far.
This means going from a DHCP based System to a mixed system with IP Adresses distributed by DHCP and some are fixed.
Our admin was not amused but we told him and he was telling us the same thing, but also could not figure out what was happening with that Hub.
But anyway, thanks for your help.
Hi SamirD,
What do you mean by "working correctly"? Because of it not working correctly i started this tread in the first place.
I have to say, i honestly don't know how to check if a hub works correctly?
It has some LEDs that were blinking, but if data was going over it not all of them were flashing simultaneously. Is that what you meant?
We reconnected all of the cables including the power supply so the Hub could restart, but it did not work.
Also, thanks for your help.
Like i already wrote, we figured out that changing the IP Adress helps with the issue, but i'm still interested how's it possible why a Hub shows behaviour that it should not be able to.
So on mine, I discovered excessive collisions and long ping times during testing. Found out that the power supply wasn't delivering the proper number of amps. If you have another power supply that meets the specs, I'd try it. (And if it's rated for more amps, that's fine too as the hub will only draw as much power as needed.)
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