6 interfaces on same network

mguy

I'm setting up a lab in a simulator so I have all the interfaces in one network to set things up quickly.

But it wouldn't let me! What's going on? Can't i have multiple interfaces in one network?

Please tell me why. And does this mean every connection has to be with different networks?

Below is what I had done for a 10.0.0.0 network. *I get "ip add overlaps" error in Router 2*

Roguetadhg

What is the subnet?

I don't see why you can't connect 6 router interfaces, given that each interface has ethernet capabilities and is connected to a hub/switch.

mguy

subnet is 255.255.255.0

mguy

mguy wrote: »

subnet is 255.255.255.0

Effectively these interfaces will be on the 10.0.0.0 network

10.0.0.1
10.0.0.2
10.0.0.3
10.0.0.4
10.0.0.5
10.0.0.6

Roguetadhg

They are all in the same network then:
10.0.0.0 /24 = 255.255.255.0

Subnet Range of 10.0.0.0 = 10.0.0.255

You'd need to split it up by giving the addresses different subnets.
Subnet 1: 10.0.1.1 - 10.0.1.2
Subnet 2: 10.0.2.1 - 10.0.2.2
Subnet 3: 10.0.3.1 - 10.0.3.2

10.0.0.0 = Class A. 255.0.0.0 Subnet = Class A.
10.0.0.0, 10.0.1.0, 10.0.2.0 w/ 255.255.255.0 = 65535 (I think) networks possible with 254 hosts possible.
The above are sample addresses you might want to assign to the interfaces.

Each interface of a router needs to be in a separate subnet, for each broadcast domain. Routers chop up broadcast domains.

Example:
(1 Host)===(Switch)===(1 Host) = 1 Broadcast Domain.
(1 host)===(Router)===(1 Host) = 2 Broadcast Domains


The only way (that I can think of at the moment) is to connect the routers to a hub/switch in the middle. Essentially, a single broadcast domain.

simonmoon

mguy wrote: »

Can't i have multiple interfaces in one network?

Indeed you cannot if you want them to be up at the same time. Routers route packets between different networks. If it had multiple up interfaces in one network, it wouldn't be able to determine which one to sent a packet out of.