Overlapping

[subhamstripathy20707]

I had taken two PC and one Router 

PC 1 IP - 192.168.40.2

GATE 1 - 192.168.40.1

PC 2 IP - 192.168.40.130

GATE - 192.168.40.129

When I am trying to link these using IOS interface ..I can able to link PC 1 with the Router but when I try to link the PC 2 with it...it shows error writing " 192.168.40.0 overlaps with FastEthernet0/0 .Can please anyone solve this issue .I will be grateful.

[paul driver]

Hello 

You need to make sure the networks dont overlapp, in your case looking at the addressing a possible solution would be.

RTR
interface 1 
192.168.40.1 255.255.255.128

PC1 
IP 192.160.40.2
SM 255.255.255.128
GW 192.168.40.1

RTR
interface 2 
192.168.40.129 255.255.255.128

PC2   
IP 192.160.40.130
SM 255.255.255.128
GW 192.168.40.129

[Giuseppe Larosa]

Hello @subhamstripathy20707 ,

a router can have only one interface connected to an IP subnet, because its job is  to perform routing also called interworking between different IP subnets.

As already suggested you need to use on you fastethernet interfaces subnet masks that do not cause the overlapping error.

int fas0/0

ip address 192.168.40.1 255.255.255.128

int fas0/1

ip address 192.168.40.129 255.255.255.128

in this way network 192.168.40.0/24 has been subnetted in 192.168.40.0/25 and 192.168.40.128/25.

to be noted even more specific subnet masks would work from /25 to /30 and all of them avoid the overlapping  error.

Hope to help

Giuseppe