Setting up DHCP with OLSR

There have been so many misleading postings on this - I will finally set the record straight.

You will need to reserve a block of IP's for non OLSR wireless clients that want to connect onto the mesh network such as a laptop. Here is an example setup:

Wireless router 1:
Wireless IP: 10.51.1.13
LAN IP: 10.3.13.1
Subnet for Wireless DHCP clients: 10.51.1.64/28 (This would mean that 16 machines could potentially connect to this wireless router. The IP leases will be in the range from 10.51.1.64 to 10.51.1.79)

Wireless router 2:
Wireless IP: 10.51.1.14
LAN IP: 10.3.14.1
Subnet for Wireless DHCP clients : 10.51.1.80/28 (IP leases will be in the range from 10.51.1.80 to 10.51.1.93)

To set this up On Friefunk firmware
Wireless Router 1:
OLSR:
OLSR DHCP: 10.51.1.64/28

Wireless Router 2:
OLSR:
OLSR DHCP: 10.51.1.80/28


Most people gave strange values for OLSR DHCP in their postings the most common one was:
OLSR DHCP: 10.51.1.80/28, 255.255.255.240

The subnet mask after the comma (255.255.255.240) is an alternative to the slash format /28. Why does everyone have this reduntant subnet mask on their postings???