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[lopan]

Hello

I have done some research but am having trouble finding an answer to my question.  Right now I use the Dir 655 but have too many devices for the four ports provided.  So I have decided that I need to buy a switch.

I have 5 Gigabit capable devices that I would plug in to the switch.  The switch I am looking at is the DGS 2205.
http://www.dlink.com/products/?pid=494

I have a DIR 655 A3 and I understand that it has a packet buffer size of over 800kb where as the DGS 2205 has one at 112kb.  If I run 5 Cat 6 cables from the switch to my 5 separate Gigabit devices and 1 Cat 6 cable from the switch to my router what would the effect be on the speed of the devices verses connecting them directly to the router?  My main concern is having multiple gigabit devices all sharing a single cat 6 connected to the router and trying to maintain optimal speeds for file transfer/retrieval with all of them running at the same time.

The devices I would connect are multiple computers/nas.  Would I be better served connecting any of them directly to the router as opposed to the switch?

And lastly I am under the assumption the switch (because it is unmanaged) does not have an ip nor will it affect the ip of the devices.  All ports will be open on the switch and it will not interfere with my already existing firewall/portfrwarding rules on the router?

Sorry for the long post, thanks to all in advance.

Colin

[lizzi555]

If I run 5 Cat 6 cables from the switch to my 5 separate Gigabit devices and 1 Cat 6 cable from the switch to my router what would the effect be on the speed of the devices verses connecting them directly to the router?  My main concern is having multiple gigabit devices all sharing a single cat 6 connected to the router and trying to maintain optimal speeds for file transfer/retrieval with all of them running at the same time.

The devices I would connect are multiple computers/nas.  Would I be better served connecting any of them directly to the router as opposed to the switch?

The switch will connect all devices at gigabit speed - no problem
You still have one gigabit line to the router which connects to the internet - if your bandwidth is not more than gigabit, there will be no problem.
If wireless devices are connected to the router, they will have speeds up to 160 Mbit in real - no problem for the gigabit line to the switch.
There will be no difference connecting the devices directly or via switch.

And lastly I am under the assumption the switch (because it is unmanaged) does not have an ip nor will it affect the ip of the devices.  All ports will be open on the switch and it will not interfere with my already existing firewall/portfrwarding rules on the router?

An unmanaged switch will not change anything regarding IP addresses or portrules.

[lopan]

Thank you for the response I think I didn't make one point clear.

I assume that all 4 gigabit (wired) devices that are connected to the switch transfer data amongst themselves by going to the switch, than to the router than back again. 

My question is if all of the devices are transfering data at gigabit speed (4gigabytes total) will they be bottle necked by the data having to run to and from the single cat 6 connecting the switch to the router?

What is the max data transfer rate a single cat 6 cable can handle?

Thanks

[lizzi555]

I assume that all 4 gigabit (wired) devices that are connected to the switch transfer data amongst themselves by going to the switch, than to the router than back again. 

If you transfer data between the devices connected to your switch, it will not reach the router.
All 4 devices will transfer directly through the switch.
Only data to the internet or other devices connected wired or wireless to the router will pass the one line to the router.

One cat6 switch to switch connection is capable of about 80-90 MB/s.
In most cases you can't reach this limit with a gigabit over copper line and 32bit cards in normal workstations.

[bluenote]

Devices that are going to have heavy local-traffic requirements (inter-device) should all be connected to the same switching device if at all possible.  Which this is, is basically a function of how many ports and devices you have.

No, your local traffic should not have to hit the router unless your network is configured incorrectly or you have something "over riding" the default direct communication behaviour.

So the answer is - with heavy inter device use yes you could saturate an "uplink" link on your *switch*.  This is actually what switches are designed to mitigate, by plugging all those devices into it, and creating a mesh link.

good luck

Most people wouldn't be transfering that much data around at the same time to care either way, just by the by, so either you are overestimating your data requirements, or you have some heavy data applications going ...