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Ethernet switch doesn't work with QNAP NAS

A

andrewd

pfm Member
Hi, I was wandering if we have any networking specialists on the forum. I have always found networks to be a major stress!

I bought a Zyxel GS100-16 gigabit ethernet switch, which is supposed to be plug and play. There are no settings or software to install. It is connected to the fibre-optic receiver box and then to a series of ethernet cables which go to ports around the house. Upstairs I have connected a wireless router (airport extreme). In this configuration the internet works.

If I then plug my QNAP TS 469 pro NAS into the Zyxel switch, the internet stops working!!!! Status light goes orange in Airport Utility and says disconnected.

I have tried various combinations of turning stuff off and on again, but can't get the damn thing to work.

Does anyone know what could be the problem?
 
sounds for to me like something has been done to the network interface on the qnap if it has two ethernet you can set it up for round robin and stuff, or perhaps it has jumbo frames turned on?
 
Very odd.
It's probably of little consolation, but I've got 2 qnaps on my network, first plugged in at different times, and have never had any issues. I wonder whether the switch is operating as it should. Do you have access to another you could try?
 
The Ethernet switch operates at the MAC layer (as do all LANs) and doesn't see any Internet Protocols. This leads to the problem being between your broadband router and the QNAP.

Cheers,

DV
 
Darth Vader said:
The Ethernet switch operates at the MAC layer (as do all LANs)
Click to expand...
Usually, I have to deal with layer 3 switches at work.

Often problems after installing a higher speed switch turn out to be bad cables. Mixing up between pairs tests ok at dc but causes big crosstalk problems, which causes lock ups
 
The OPs switch is a basic unmanaged Layer 2 switch. Everything works until the QNAP is plugged in. If it were me I'd checkout the network config of the NAS as its this that screws up his router.

However we are not on premises and can't actually 'see' for ourselves what is happening.

Cheers,

DV
 
Is the QNAP NAS new?

QNAP have a piece of software that "discovers" NASs on your network.

Download that, then once installed plug the QNAP back in and run the discovery software. You should be able to log into the NAS as Admin/Admin (user/password). Then you can check settings.

Another option that might help is to stick a paper clip in the NAS's reset button. This should not touch data on the drive - but do this at you own research/risk - and note that it will reset the password to "admin".
 
If I were to guess, i'd say the device is running something like a DHCP server, and is picking up and assigning addresses to connected devices in such a way that they are unable to reach the internet (so have, for example, the wrong default route, DNS addresses etc).

I'd have thought you have a couple of options:

1) Connect the NAS to a PC directly (only things on the switch) and try to use it's built in web service to reconfigure the services which are available. If it is running a DHCP server, and your modem/router also is, you'll have fun, so you need to disable one of these, and have the other provide the right details. I'd probably disable the NAS, and have it run a DHCP client mode, or set it up with a fixed IP to be visible on your home network.

2) Push some sort of 'reset' button on the NAS, and reconfigure it from scratch. Chances are the defaults will be suitable for many networks, and will step you though the configuration.

Out of interest, I presume this was working in a previous configuration, and you mention getting a switch has caused it to stop - what has changed?
 
I had a qnap and managed to kill my entire network with it by playing around with how the ethernet ports behaved and when I played with jumbo frames. in both cases it destabilised the network.

I learnt to stop fiddling
 
thanks for all the replies. it's a long day so will probably research this thread tommorrow and try to trouble shoot. I got a reply from Zyxel saying that the Fibre receiver should be wired to a WAN port of the router, and then you wire the LAN port of the router to the switch. In other words, you cannot wire straight from the fibre receiver to the switch.

This is quite annoying because i don't want the router downstairs near the fibre receiver, since it is a crap location for wifi signal in the main living area of the house.
 
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