Digital Watchdog Starlight D1363D Informacje Techniczne Pobierz pdf (Strona 100)

These two networks have 16 IPs each (2^(32-28)). If we divide the upper network's network address by

16, we get 64 / 16 = 4. This number is even and tells us that opening our subnet (i.e., changing our

subnet to a /27) will not allow these two subnets to be combined. In fact, if the 192.168.1.64 was

opened even further, it would only continue to expand upward, not down into the original 192.168.1.48

network: 64 / 32 = 2. It is only when we get to a /25 suffix, do the two networks in this example

combine. By then we have a subnet of 128 IPs.

Finding the network

For those of you who still haven't quite caught on, we can identify the network and broadcast address of

any network given only the IP and the suffix. Let's try an example:

192.168.1.195/27.

First find the number of IPs:

32-27=5

2^5=32

So we have 32 IPs. You could just count it out: 2 – 4 – 8 – 16 – 32. Extend five fingers one at a time

doubling the number as you go.

Now, just divide 195 by 32 == 6 remainder 3.

Using only the 6 and multiplying by the number of IPs, we get:

6 * 32 = 192. So our network address is 192.168.192/27.

To find our broadcast address, we get the next network address and subtract 1:

7 * 32 = 224; 224 – 1 = 223. So our broadcast address is 192.168.1.223.

Routing

It doesn't do much good to break your network up into tiny little pieces if you don't know what to do

with the pieces afterward. So here's how this will play out. This is based on an actual network, and

you may or may not see the sense in doing it this way. Remember, if it works, it's not wrong. But I like

to keep things logical. And since this is my network, here are my rules:

I have several /27 networks to distribute to remote radios. They are:

10.10.1.32/27

10.10.1.64/27

10.10.1.96/27

While I could keep going, the principal will be the same. My distribution scheme goes like this:

From my principal router, I use 192.168.255.0/24 for local routing. The radio links use 172.16.#.0/24 to

route over the air. I have 3 radios on my roof each talking to a different remote radio. The remote

radios will be APs that will route to the client radios. Client radios will do NAT routing so clients can

have as many systems as they want.

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Digital Watchdog Starlight D1363D Informacje Techniczne Strona 100