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Will 100mbps modem/router limit Gigabit switch connections?

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Hi all,

Just wondering if anyone could help with a small concern I'm having regarding an intended network setup?

Basically I've just had ADSL activated and due to a somewhat noisy line (even at the BT master socket using an ADSL Nation XTE-2005 faceplate) I would prefer to have the ADSL modem/router (a Sky supplied Netgear DG834GT) plugged in to this rather than running it off an extension.

My 2 primary desktop PCs (labelled PC #2 & PC #3 - both with dual onboard gigabit LAN ports) are on the 1st & 2nd floor but due to the slightly complex layout of rooms in the house I'd prefer to run only a single cable upstairs.

I'm also intent on avoiding using wireless (been using this for laptops for many years and have never been 100% satisfied) and powerline networking for these machines (old house, wiring not ideal) and so have decided upon the below layout as being easy enough to implement.

My question then concerns whether the computer-computer connection between PC #2 & PC #3 will be at the gigabit speed, even though the router is limited to 100Mbps?

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I have a similar configuration here at my place. If you are transferring data from 1 PC to another, you only need to be concerned with what is in between the 2 points. So transferring from #2 to #3, you'll get full gigabit speed. However, going from PC 1 to PC 2 or 3, you will be bottlenecked at 100mbit because your router is 100mbit.

I wanted all gigabit myself, and the way I got around it was I bought an 8 port gigabit switch for about $20 a few months ago when they were significantly discounted. Then I plug the new switch into the router, and then everything else plugs into the new switch. Problem solved.

-Cyberjock

Reply to cyberjock

Thanks for the response - I've heard the same on other forums so I'll consider the matter resolved.

Reply to oext

I have a question somewhere along the same line. I have a fantom drives gforcenas box with 2 WD SATA 500GB RE2s in it. It is attached to a trendnet 5-port gigabit network switch along with the rest of my networked devices, computers, etc. all connected at 1000 with the exception of my 100Mbit Gigaset/Siemens ADSL Modem/Router (frontiernet internet). As far as I can tell, the nas box pulls it's ip address off the slow modem router so that it is in the same subnet (192.168.254.XXX) as the rest of the devices on the switch or modem (I have nothing attached to the modem except the switch, phone, and power cord). But I think even though the nas box shouldn't need to go through the modem, something is limiting it to ~ 9MBytes/sec (less than 100Mbit/sec). Any ideas why I'm only getting 100Mbit speed over what should be 1000Mbit network, except for the modem?

Reply to crazy_driver_78

What's happening is since you're NAS is getting it's IP from the routers DHCP client, it's also supplying the NAS with a default gateway, being the internal IP of the router.

So, when the NAS wants to communicate with someone on the same LAN, it sends it to the router, and the router forwards the data to its next destination...thus limiting it to 100Mb/s.

Of course, this depends on whether or not im picturing your topology right. Maybe a picture/diagram would help.

Reply to ryanmission

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