User's Manual

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This document is intended for Public Distribution
19473 Fraser Way,
Pitt Meadows, B.C. Canada V3Y 2V4
Appendix G
G-5
TR-5A Series
Tranzeo Wireless Technologies
Public IP’s to multiple Clients Through One Radio
Assuming that you have a full Class C sub net, 216.129.68.X, you have 254 possible IP’s to use, from 1 to
254. The Subnet mask for this can be written as 255.255.255.0 or /24. However, you want to give each
client a public IP. If the client has less than 10 PC’s or an external router to attach, then bridge mode will
work fine. See example above. But, if they need to have more than 10 computers on a public IP, you need
to subnet your class C license.
Let’s keep it simple for now, and divide your class C into 2 blocks of 126 licenses each. You’ll note that ½
of a full class C is not 128 licenses. Every time you divide a subnet, you need to dedicate more IP’s for use
as broadcasts. To divide into two blocks, we use 255.255.255.128 as our subnet mask. 255.255.255.128 can
also be written as /25.
Now our network looks something like this
One subnet consists IP 216.129.68.1 to 219.129.68.127 and the other consists of 216.129.68.129 to
216.129.68.254. Using the shout / route rule, then any IP in the first group shouts to any other IP in that
group, but need to route to any other IP on the network. The Gateway, by convention in this document, in
placed at the bottom of the range.
By placing client PCs in one subnet, and the WAN side of the Radio on the other subnet, we can offer
multiple public IPs that will route. Unlike in the NATing example, we don’t need the Router to translate
public to private IP, so make sure that NAT is disabled.
So lets look at an example