subnet prb

binoyjosephstanly · ‎03-03-2007

dear all, i got an an ip address 10.73.0.0 there is no specific subnet mask given, now for my h.o i need to get 256 diff subnetworks, and each subnet should be able to take 254 hosts. and i've 20 diff remote locations also.

so i want to utilise subnets from this 10.73.0.0 in these 20 location's, in one location there will be 3 vlans and hosts should be 128 no's. so for 20 locations say 20*3 = 60 subnets.

how can i achieve that thru subnetting.

i will rate all the posts.

Danilo Dy · ‎03-03-2007

Information:

Given IP Address = 10.73.0.0 (no subnet mask)

Head Office needed # of networks = 256

Head Office needed # of hosts per network = 254

Remote Locations = 20

Needed # of VLAN per Remote Location = 3

Needed # of hosts per VLAN in Remote Location = 128

Solution:

1. Proposed IP Address

10.72.0.0/15 = 10.72-73.0.0/16

2 Head Office IP Address

10.72.0.0/16 = 10.72.0-255.0/24

256 Subnets (/24 each) and 254 hosts per subnet

3. Remote Locations

10.73.0.0/18 = 10.73.0-63.0/24

64 Subnets (/24 each) and 254 hosts per subnet.

NOTE: We can't get exact 128 number of hosts per subnets, therefore we use /24 per subnet. /25 is maximum 126 hosts.

4. Spare Subnets

10.73.64.0/18

10.73.128.0/17

binoyjosephstanly · ‎03-03-2007

Dear medan,

thanks for your reply.

i can see that for H.O 10.72.0.0/16 is given, but i got only 10.73.0.0 address.

can you give the network address also for these.

Danilo Dy · ‎03-03-2007

Hi you mentioned that you were given an IP Address of 10.73.0.0 without subnet mask. Since you also need IP Address in remote locations, I assume that the subnet mask for 10.73.0.0 is not /16. However, if you want to use 10.73.0.0 in Head Office, just switch the two IP Address as in;

1. Proposed IP Address

10.72.0.0/15 = 10.72-73.0.0/16

2 Head Office IP Address

10.73.0.0/16 = 10.73.0-255.0/24

256 Subnets (/24 each) and 254 hosts per subnet

3. Remote Locations

10.72.0.0/18 = 10.72.0-63.0/24

64 Subnets (/24 each) and 254 hosts per subnet.

NOTE: We can't get exact 128 number of hosts per subnets, therefore we use /24 per subnet. /25 is maximum 126 hosts.

4. Spare Subnets

10.72.64.0/18

10.72.128.0/17