06-09-2012 07:30 AM - edited 03-03-2019 06:37 AM
Hello, this is what I'm trying to solve.. it is a given topology and the two addresses (64.110.77.97/30 & 64.110.78.97/30) are required. I'm having problems setting up the ip addresses. If I have 64.110.77.97/30 that means 64.110.77.98 & 64.110.77.99 should be the two available host slots, right? But when I try to assign the .99 address to the s0/0 on the "Praha" router it tells me that 64.110.77.99/30 is bad mask.
Can anyone tell me what am I doing wrong? Or what ip address should the s0/0 at the "praha" router have and what should be assigned to s0/0 on "Internet". Thanks for all the comments.
06-09-2012 07:40 AM
I think I've just solved it bymyself since it is /30 the increment is 4 and I shouldn't start from 97, but from 0 right?
So it starts as 64.110.77.0 - 64.110.77.3 and by repeating this I end up at 64.110.77.96 - 64.110.77.99 and that means, that the address I was giving isnt a network ID but already one of the host available addresses, because the network ID is 64.110.77.96 and 64.110.77.99 is broadcast, therefore I should be using .97 & .98 for the two points. Am I right?
06-11-2012 07:47 PM
Jonathan Statham wrote:
I think I've just solved it bymyself since it is /30 the increment is 4 and I shouldn't start from 97, but from 0 right?
So it starts as 64.110.77.0 - 64.110.77.3 and by repeating this I end up at 64.110.77.96 - 64.110.77.99 and that means, that the address I was giving isnt a network ID but already one of the host available addresses, because the network ID is 64.110.77.96 and 64.110.77.99 is broadcast, therefore I should be using .97 & .98 for the two points. Am I right?
Yup, you sure are.
The addresses for the given subnet are as follows
64.110.77.96 <--- Subnet Address
64.110.77.97 <--- Node Address
64.110.77.98 <--- Node Address
64.110.77.99 <--- Broadcast Address
Your two "usable" IP addresses are .97 & .98 - .96 is your 'network, and .99 your broadcast address in that subnet.
Download the Solar Winds Advanced Subnet calculator (it's free) - it helps if you don't have VLSM straight in your head like us old buggers do. :-)
Cheers.
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