netgear gs108tv1 problems slow, fragmentation, crc errors

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rocket88

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Apr 1, 2014
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I just bought a used netgear gs108tv1 smart switch off ebay. I am trying to use this instead of a working unmanaged trendnet switch. Bottom line is I think this might be a lemon. Here's what I've done so far.

Starting from the beginning....

I have an 8 port gigabit trendnet switch with a tivo and some pc's connected. All is well. Transfer speeds are as expected. I can even file copy windows to windows at 100m bytes/sec on the gigabit ports.

I first did a factory reset and tried to just replace the trendnet, moving all the connections from trendnet to netgear ports 1 thru 6.

First problem is that it will not work with an intel based 82566dc controller on a computer running windows xp sp3 at gigabit speed.

I then connected a laptop to the netgear and got into the confgure by web interface. If I configure the port down to 100m then I can connect this xp pc. But it runs very slow.

With the trendnet now available (having moved all the ports to the netgear) I then tried to connect just the winxp to the trendnet and the trendnet to the netgear, and then I could go gigabit in both. However, it runs extremely slow.

I go into the netgear monitoring and it says that I'm getting crc align errors about 25% of the time. If i set the port between the two switches back to 100m, I still get 25% errors but now it says fragmentation. I've done some cable swapping with no changes. I've even downgraded the firmware to a previous version and then back to the latest version - which it had when I got it. The older version was just as bad, even worse. But I got it back to the latest version ok.

I'm beginning to think I got a bad netgear switch here. Any ideas what it might be short of that?
 
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bill001g

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It is really strange it will not auto negotiate the speeds. The issue you have when you try to set the port speeds is it completely turns off the negotiation of port speed and duplex. This means that if you set one side to a fixed rate and the other side is still auto it will not receive the signalling and assume half duplex.

All the errors you are getting are related to the port being half duplex. You need to hard code both the speed and duplex both on the switch and the PC as 100m full duplex.

Still it should just work, it could be defective but it is unlikely it is all the ports.

There are a few other option related to flow control and such I would try to disable these on the PC and see if it makes any difference at all....it should just work at gig speeds.
 
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rocket88

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After more testing, I also have the same errors when I plug into the netgear just two other systems (a laptop and a tivo) which both only speak 100m. Each has the same troubles.

As to the original intel system with the 1000m, I've also isolated it on the switch with only the tivo with similar results. I've gone into the network settings and told it to manually configure to 100m and it then gets the same results as my laptop gets. You should see all the errors reported by wireshark on this system. At 1000m with both sides auto neg, it won't talk at all, not even a ping.

At this point I'm 99% sure it's a hardware problem. No wonder it was going for $39 on ebay. But it has a lifetime warranty and I've opened a line to netgear support. Probably easier than trying to return it to the ebay vendor.

There was also a suggestion about drivers. I don't think this is the problem. The tivo is automatically up to date and my other gear have no driver updates (a security dvr). And everything works just fine on my 2 unmanaged switches, one is even another netgear.

Thanks for the help.

 
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