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alextech1
Beginner

Why IP overlapping?

I'm trying to do a lab in PT. and get the following error:

FIRST
Router(config)#int G0/0
Router(config-if)#ip add 192.168.0.1/30
Router(config-if)#exit
SECOND Router(config)#int G0/0
Router(config-if)#ip add 192.168.0.2/30

NOW, ON THE SECOND ROUTER I TRIED CONNECTING A SWITCH connected with 5 PCs

SECOND
Router(config)#int G0/1
Router(config-if)#ip add 192.168.0.5/29
% 192.168.1.0 overlaps with GigabitEthernet0/0


The last Valid IP Address for 192.168.1.0 is 192.168.3. The next subnet is 192.168.0.4.
Why is overlapping when I'm using /29 with Valid host from 192.168.1.5 to 192.168.1.11 which doesn't fall in the range of /30 192.168.1.1 to 192.168.1.3?

1 ACCEPTED SOLUTION

Accepted Solutions
Philip D'Ath
Advisor

192.168.0.0/29 runs from 192.168.0.0 to 192.168.0.7 (it does not starts at 192.168.0.5).  The next block starts at 192.168.0.8/29.  So it is indeed overlapping.

So the second router needs an IP address of 192.168.0.9/29.

View solution in original post

5 REPLIES 5
Philip D'Ath
Advisor

192.168.0.0/29 runs from 192.168.0.0 to 192.168.0.7 (it does not starts at 192.168.0.5).  The next block starts at 192.168.0.8/29.  So it is indeed overlapping.

So the second router needs an IP address of 192.168.0.9/29.

View solution in original post

If you use windows then this is a good subnet calculator:

http://www.solarwinds.com/products/freetools/free_subnet_calculator.aspx

On Linux a good tool is ipcalc.

Thank you so much. I'm new to the whole subnetting. Trying to understand as much as possible before trying to use any Calculators. I see my confusing.

I thought because R1 ended at 192.168.1.3 and next Subnet was 192.168.1.4, I could use 192.168.1.5. Not realizing that /29 Still covered from 1-7. I fixed the problem by making My G0/1 Ip Address 192.168.1.9 connected to the which with is connected to the  5 hosts.

Host 1 = 192.168.1.10

Host 2 = 192.168.1.11

Host 3 = 192.168.1.12

Host 4 = 192.168.1.13

host 5 = 192.168.1.14

joepeeer
Beginner

thnk u

If you use an IP address in your and return you assign the same IP address in your network this time you can see the overlapping massage... This call overlapping and you can't apply this IP address in your network. In this case, you need to check the IP address in your network and assign a new IP in the network .... thanks a lot...