User guide

Canopy System User Guide Translation Bridging
pmp-0229 (Mar 2013)
165
Octet 1 Octet 2 Octet 3 Octet 4
IP address 169.254.1.1 10101001 11111110 00000001 00000001
Subnet mask 255.255.0.0 11111111 11111111 00000000 00000000
Figure 53: Example of IP address in Class B subnet
In this example, the network address is 169.254, and 2
16
(65,536) hosts are addressable.
Selecting Non-routable IP Addresses
The factory default assignments for network elements are
• unique MAC address
• IP address of 169.254.1.1, except for an OFDM series BHM, whose IP address is 169.254.1.2
by default
• subnet mask of 255.255.0.0
• network gateway address of 169.254.0.0
For each radio and CMMmicro and CMM4, assign an IP address that is both consistent with the IP
addressing plan for your network and cannot be accessed from the Internet. IP addresses within the
following ranges are not routable from the Internet, regardless of whether a firewall is configured:
• 10.0.0.0 – 10.255.255.255
• 172.16.0.0 – 172.31.255.255
• 192.168.0.0 – 192.168.255.255
You can also assign a subnet mask and network gateway for each CMMmicro and CMM4.
Translation Bridging
Optionally, you can configure the AP to change the source MAC address in every packet it
receives from its SMs to the MAC address of the SM that bridged the packet, before forwarding
the packet toward the public network. If you do, then
• not more than 10 IP devices at any time are valid to send data to the AP from behind the SM.
• the AP populates the Translation Table tab of its Statistics web page, displaying the MAC
address and IP address of all the valid connected devices.
• each entry in the Translation Table is associated with the number of minutes that have elapsed
since the last packet transfer between the connected device and the SM.
• if 10 are connected, and another attempts to connect