Firewall Router Crashing on plugging in all Ethernet cables

Hi

At home, I have a firewall router (netgear prosafe fvs318g). Now I have upgraded to the latest firmware (3.1.1-08) and since upgrading the device crashes if I attach a ethernet cable that doesn't have a device attached to it on the other end.

As I am not a network specialist, I was wondering whether this is expected behaviour. Before the firmware upgrade all network cables were connected, even if no device was attached. This was brilliant as I was able to attach any device on demand in any room with a ethernet port, without having to patch a cable to the firewall router.

Is this a setting in the firewall router or a general network design issue?

Any help very welcome...
riffrackAsked:
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Don JohnstonConnect With a Mentor InstructorCommented:
the device crashes if I attach a ethernet cable that doesn't have a device attached to it on the other end.
There is no way for a network port to know that a cable is connected if the device at the end is not powered. Sounds like a bad cable or connector. Have you tried a different cable?
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asavenerCommented:
Chances are there's a short in the cable somewhere.
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riffrackAuthor Commented:
The strange thing is, everything worked before I upgraded the firmware. All network cables are identical. The upgrade only lastest 10 mins, would be quite a coincidence, if the cable broke exactly within those 10 mins. I didn't even unplug the cables during the upgrade, only had to do that when the router didn't respond after the upgrade.

It appears that when I plug in a cable that has a switched on device attached (hence the LEDs flash), then the router works fine. If I attach a cable with no end device or switched off devices (hence no LEDs flash), then the router stops responding.
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asavenerCommented:
Next step would be to try walking back down the releases to see if you can find one that doesn't have the issue.

And, no, this is not expected behavior.
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Don JohnstonInstructorCommented:
I certainly would be a coincidence. But... I have never seen an ethernet port which can detect when an RJ-45 is inserted. The only thing a port can detect is activity. So if the cable is not connected to anything, then is has to be either a damaged cable or connector.
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riffrackAuthor Commented:
Thanks for the advice it was a broken cable in the end
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