Hi
This subnet was subnetted incorrectly,
/28
192.168.1.64 192.168.1.65-70 192.168.1.71
if you are looking for /28 from 192.168.1.64 it should be:
192.168.1.64 -- Valid IP addresses: 192.168.1.65 - 192.168.1.78 -- Broadcast IP 192.168.1.79
Subnet mask: 255.255.255.240
Now for the 3x /30 you should use:
192.168.1.80/28 to get them.
That is the reason why you are getting overlapping error with the next subnets.
:-)
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