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Netgear ProSafe GS724TP Network Switch Problems

I have a customer were I installed a Netgear ProSafe GS724TP Network Switch
together with a new SBS 2008 server.

After the SBS 2008 server and netgear switch were in place for a few weeks the
users started getting errors that the domain controller could not be found when
logging in to their workstations.

I put the old dlink network switch back in place and the problem was gone. Then
I had the netgear switch replaced under warranty thinking that it was a faulty
switch. After receiving the replacement I have the same problem. The users are
getting the same errors.

I put the old switch back on and everything works fine.

Anyone else has had the same problems? Any advice for me?

Gerhard
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Gerhardpet
Asked:
Gerhardpet
1 Solution
 
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
What's the network speed and duplex settings set to?

Do you see any errors in the logs on the server?

What is the server, do you see any errors on the network interface configuration on the server?

Can you ping the server, when users cannot login?

Does network interface appear disconnected?

Have you tried a different network port?
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GerhardpetAuthor Commented:
Here are the answers to your questions

What's the network speed and duplex settings set to?
1000M including the server and all workstations

Do you see any errors in the logs on the server?
No

What is the server, do you see any errors on the network interface configuration on the server?
No

Can you ping the server, when users cannot login?
Yes

Does network interface appear disconnected?
No

Have you tried a different network port?
Yes
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
what network ports have you tried? the reason I ask, is some network switches, the inexpensive variety, use an inexpensive ASIC chip, that controls 4 or 8 network ports, and under load, ports can fail, it's called oversubscription.

So if you want real 1Gb throughput, you should use every 4 or 8 ports.

So use Port 1, and then Port 5 etc (if 4 port ASIC is used) or Port 1, and then Port 9. (leaving the other ports empty), and then repeat.
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GerhardpetAuthor Commented:
So far just plugged in from 1 to 22. I only have 24 ports and have 22 devices in total. The only way I could test is by leaning the old switch in place and then only plug in a few devices.
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Aaron TomoskyTechnology ConsultantCommented:
This is a poe switch. If your devices don't need Poe turn it off.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
when it's heavily used, like that it will be difficult to test. But you could patch the old switch in, with the majority connected to it, and try the 1 port in 4, or 1 port in 8.

Personally, I wouldn't run ALL at 1Gb. (100MBb for workstations), 1Gb for server.

You will just get a bottleneck, unless you can do something with the server, like connect at 2Gb.

You could ask Netgear, if it suffers "oversubscription". They may or may not, give you a clue.
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GerhardpetAuthor Commented:
POE is being used for a few security cameras.

I will call Netgear tomorrow for support and see what they say.
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Rick_at_ptscintiCommented:
All users or just some?  If it's only some I would look for interface errors for those users.

Was the old switch Gig?  Is your cabling Cat5E or better?  I've seen this sort of thing behavior from insufficient wiring.  If that's the issue then forcing the ports to 100full should resolve the issue.
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naughtynatCommented:
We use that same switch and havent had any issues as well as our of our customers.

PoE also used for security cameras.

I have never had to use ports 1-4-8 etc. That seems very unusual.

The GS724TP is no budget switch.

I assume the old network switch runs @ 100Mb? I have seen issues with some network cards and running Gigabit. On the workstations change the speed to 100Mb. I wouldnt change this on the actual ports (via the web gui).

I would also probably look at running something like ipHost on the server, this will monitor network connections and give you very good graphical read-out of if the network connection is being dropped.

Maybe it could even be the server network card is struggling with the additional load or something like that. Might be worth just changing server back to 100Mb and see if that makes any difference.
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GerhardpetAuthor Commented:
naughtynat are you running a Windows Domain Controller/DNS in your network?

I've been running Wireshark and found that DNS trafic from the server to the workstation is being dropped. From the workstation to the server the trafic is not dropping. As soon as I put the old switch back I have no problems

I'm in contact with Netgear Level 3 support and so far it is pointing to a flaw in the network switch.

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GerhardpetAuthor Commented:
It is a bug in the network switch. I will now close the question.
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GerhardpetAuthor Commented:
It is a bug in the network switch
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