Subnetting help

Hey guys,

what do you think of this routing scheme?

Subnet Network Address Starting Host End Host Broadcast Netmask
0 10.0.0.0 10.0.0.1 10.31.255.254 10.31.255.255 255.224.0.0

Address: 10.10.10.1 00001010.000 01010.00001010.00000001
Netmask: 255.224.0.0 = 11 11111111.111 00000.00000000.00000000
Wildcard: 0.31.255.255 00000000.000 11111.11111111.11111111
=>
Network: 10.0.0.0/11 00001010.000 00000.00000000.00000000 (Class A)
Broadcast: 10.31.255.255 00001010.000 11111.11111111.11111111
HostMin: 10.0.0.1 00001010.000 00000.00000000.00000001
HostMax: 10.31.255.254 00001010.000 11111.11111111.11111110

1 10.32.0.0 10.32.0.1 10.63.255.254 10.63.255.255 255.224.0.0
2 10.64.0.0 10.64.0.1 10.95.255.254 10.95.255.255 255.224.0.0
3 10.96.0.0 10.96.0.1 10.127.255.254 10.127.255.255 255.224.0.0
4 10.128.0.0 10.128.0.1 10.159.255.254 10.159.255.255 255.224.0.0
5 10.160.0.0 10.160.0.1 10.191.255.254 10.191.255.255 255.224.0.0
6 10.192.0.0 10.192.0.1 10.223.255.254 10.223.255.255 255.224.0.0
7 10.224.0.0 10.224.0.1 10.255.255.254 10.255.255.255 255.224.0.0

this is for a small company with several locations

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Comments

VAHokie56

Seems like a BIG scope for a SMALL company...whats the topology like?

Sounds Good

VAHokie56 wrote: »

Seems like a BIG scope for a SMALL company...whats the topology like?

what do you mean by topology?

I'm thinking we could get just use Class C addressing. We have less than 100 total machines that would require IPs.

phobophile

Sounds Good wrote: »

what do you mean by topology?

I'm thinking we could get just use Class C addressing. We have less than 100 total machines that would require IPs.

If you have less than 100 hosts, then you should definitely consider using a Class C private address block. However, if you are going to implement subnetting, you need consider how many offices you have, as well as how many hosts in each office. In addition, is this business going to grow? You definitely need to look into the future, and implement an addressing scheme that is future-proof as possible.

Since you listed 7 networks, we could use a Class C address block (192.168.0.0) with a /27 mask - which would give you a 8 subnets with 30 possible hosts per network. However, if more locations open up, you may have to consider using a /28 mask (16 networks), but then that limits you to 14 available hosts per network.

If you need more hosts per subnet, then just use other Class C blocks (192.168.1.0, 192.168.2.0, etc etc.)

Sounds Good

boss said that because many public networks use class b and c, it could cause problems with accessing the vpn.

tha_dub

WTF?

Yes pretty well all companies use public/private class B and C networks and big ones use class A.... Could you ask him to explain how other companies using public or private class A B or C network might interfere with your VPN and post back?