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Max number of devices on a LAN
sirgeez May-23-02 11:24 AM
Is there a max number of devices that you can have on a LAN. Please help me

2. RE: Max number of devices on a LAN
lbyard May-23-02 11:56 AM
In response to message 0
What kind of LAN? How many devices do you have in mind? Please loosen-up and provide some info if you want some answers. Larry

3. RE: Max number of devices on a LAN
sirgeez May-23-02 12:08 PM
In response to message 2
Static IP addresses with hubs. I need to know how many hubs can I have before I lose data integrity. I currently have 4 24 port hubs and 2 8 port.

5. RE: Max number of devices on a LAN
lbyard May-23-02 12:35 PM
In response to message 3
I have not built a network that large, but other readers have probably delt with them, so stay tuned. Even as it is, I would start by breaking that network down into segments with an Ethernet switch or two and probaly get rid of the smaller hubs while I was at it. There are much larger networks out there. I would also set-up a DHCP server and use dynamic IPs. Larry

6. RE: Max number of devices on a LAN
lbyard May-23-02 12:47 PM
In response to message 5
As I understand it, theoretically an Ethernet segment without bridges, routers, etc. can have up to 1,024 devices. It probably wouldn't work. Larry

7. RE: Max number of devices on a LAN
Twinhead May-24-02 03:12 AM
In response to message 0
There is theoretically no maximum as long you could assighn unique IP numbers.
But, If you are going out on the Internet with it, there could be a problem.

Whe, a School in Holland, have at least 250 PC's and a bunch of Printers linked to the network.
Beceouse we have a permanent link to the Internet, we have obtained a Super Ip range from our Provider. (512 leases)
That is an range which is reserved for us so that there will be no other domain using it.
We use a DHCP server who assighn numbers to the machines when they are logging into the network.
Beleave me, Having an own DHCP server instead of getting leases from the Internet is FAR MORE STABLE!!
If the internet is down, or our Provider is down, we can stil logging into our own Intranet.
With no DHCP from our own server, we were down too!

So, our maximum devices (PCs, Printers and Servers) on our segment is 512

Whe uses three blocks with eiter 5 Switches.
Two blocks are linked with Glassfiber.
The third with a Dual channel 10 M'bit Air tranceiver.
The switches are linked as a Starpoint. (NOT daysy chained)

Normally you can make it into ONE block, but we have three seperate buildings here.

Example of my way to connect them as a Starpoint I assume Switches by default, Substitute Hub if needed.
This is my faforite way to connect hem:

4 Switches/hubs and their linkup:

Switch 1`(most on top)
port 1: Main Server (Straight thru cable)
Port 2: Port one of Switch 2 (Cross cable), First lower Switch
Port 3: Port one of Switch 3 (Cross cable), Second lower Switch
Port 4: Port one of Switch 4 (Cross cable), Third lower Switch
The rest of the ports are for the additional Servers, AND all 1st ports for Workstations.

Switch 2
Port 1: Comes from Switch 1 Port 2
Port 2...24: Workstations.

Switch 3
Port 1: Comes from Switch 1 Port 3
Port 2...24: Workstations.

Switch 4
Port 1: Comes from Switch 1 Port 4
Port 2...24: Workstations.

... And so on
With this linkup, you can assighn up to 529 PC's.


Straight Thru cable, BOTH ends!

1 White/Green
2 Green
3 White/Orange
4 Blue
5 White/Blue
6 Orange
7 White/Brown
8 Brown

Crossover cable, ONE end is the A-type, The other is the B-type

1 White/Orange
2 Orange
3 White/Green
4 Blue
5 White/Blue
6 Green
7 White/Brown
8 Brown

8. RE: Max number of devices on a LAN
lbyard May-24-02 10:47 AM
In response to message 7
When I said segment I was referring to the definition of an Ethernet segment, not a LAN with many segments. It looks to me like you have many Ethernet segments in that network. Each port on a switch (http://duxcw.com/faq/network/hubsw.htm) is a separate Ethernet segment. A hub and all of the PCs on the hub are in one segment or collision domain. Cascaded hubs are all part of the same segment. Each switched hub in a cascaded configuration is a separate Ethernet segment. An Ethernet segment can have up to 1024 device, however, you will probably find that network performance will drop-off because of packet collisions if those devices are active PCs and there are more than a half a dozen or so. In fact, you will see it slow down if two or three of them start copying a lot of files to each other. You will not see it drop off if the same PCs are connected to a switch because each is in its own separate segment/collision domain. Larry

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