Very Basic question but confused.

DANMOH009

I am just setting up a basic network to monitor the election process in ospf. I am told in the lammle book to configure a basic network, but can someone please explain to me why this is not working, i have been away for a good 4 weeks so just trying to get back into the swing of things with my revision, and think im missing something very basic.


R1 >>>>>>><<<<<<<<<R2>>>>>>>>><<<<<<<<<R3

R1
Ip on fa0/0 is 10.1.1.1/24

R2
Ip on fa0/0 is 10.1.1.2/24
Ip on fa0/1 is 10.1.1.3/24

R3
Ip on fa0/1 will be 10.1.1.4/24 --- but it wont let me get that far it says % 10.1.1.0 overlaps with FastEthernet0/1
FastEthernet0/0: incorrect IP address assignment

Now i know they are all in the same subnet, but is it not possible to have 2 networks in the same subnet?

Thanks in advance.

DANMOH009

Please ignore this guys and girls sorry for wasting your time, Its just dawned on me that:

1. Why would you even need a routing protocol, if the routes are in the same network!!!!!!!!!!!!

Oh my god, my bad.

lincis_aus

You would need to turn on OSPF on that segment to advertise the subnet to networks beyond your 3 routers.

I noticed that on R2 you have 2 interfaces on the same subnet. This is illegal and goes against the rules of routing

lincis_aus

Just saw your diagram... The addressing is completely wrong...

Try the following addressing
R1
Ip on fa0/0 is 10.1.1.1/30

R2
Ip on fa0/0 is 10.1.1.2/30
Ip on fa0/1 is 10.1.1.5/30

R3
Ip on fa0/1 will be 10.1.1.6/30

In other words, each interface has to be a seperate network, you cannot have multiple interfaces on the same router in the same network