overlaps

[RoeeM]

what id do wrong hereis the problem is the subnet? what i need to do to fix it?

[Flavio Miranda]

Hi

 One way to fix it is using a different network.  When you added  172.20.40.0 with mask 255.255.254.0 , the range goes from 172.20.40.0 up to 172.20.41.254, which overlaps with the IP address you tried to use  172.20.40.30.

To fix it use the follwing IP address

interface gi0/1.20
ip add 172.20.42.30 255.255.254.0

[RoeeM]

hello
we told : Do not exceed this address range
also we have only 48 employers
it's needed to be most economical
so the Q is i have 7 vlans. what the ip range in each the vlans? thnks it's
for friend

[Flavio Miranda]

For 48 PC you can use 172.20.40.0/26

255.255.255.192

The range would be

172.20.40.1 up to 172.20.40.62

172.20.40.65 up to 172.20.40.126

So on so forth

[RoeeM]

the problem is he give as 172.20.40.0/23 so i cant change to 26
thanks for your answer

[Flavio Miranda]

Yes you can. They give you /23 so that you can have planty of networks but you just need to break it.

share the project and I can help you. Just zip it to attach

For example, the Vlan 10

They are telling you that the network is 172.20.40.0 and they are saying that the range is from 1 up to 14, which gives you 16 hosts. For 16 hosts the mask is 255.255.255.240.

You just need to add this to the subinterface on the router