Chapter 3: System planning
167
Example IP address and subnet mask
In Example of IP address in Class B subnet, the first 16 bits of the 32-bit IP address identify the network:
Figure 64 :
Example of IP address in Class B subnet
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
In this example, the network address is 169.254 and 2
16
(65,536) hosts are addressable.
Select ing non- r out ab le IP ad d r esses
The factory default assignments for network elements are:
l
Unique MAC address
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IP address of 169.254.1.1
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Subnet mask of 255.255.0.0
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Network gateway address of 169.254.0.0
For each radio 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:
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10.0.0.0 – 10.255.255.255
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172.16.0.0 – 172.31.255.255
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192.168.0.0 – 192.168.255.255
Also, the subnet mask and network gateway for each CMM4 can be assigned.
Tr anslat ion b r id g ing
Optionally, the AP can be configured to change the source MAC address in every packet it receives from
its SMs to the MAC address of the SM/BHS that bridged the packet, before forwarding the packet toward
the public network. In this case:
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Not more than 128 IP devices at any time are valid to send data to the AP from behind the SM.
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SM populates the Translation Table tab of its Statistics web page, displaying the MAC address and
IP address of all the valid connected devices.
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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.
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If 128 are connected, and another attempt to connect:
o
If no Translation Table entry is older than 255 minutes, the attempt is ignored.
o
If an entry is older than 255 minutes, the oldest entry is removed and the attempt is successful.
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The Send Untranslated ARP parameter in the General tab of the Configuration page can be:
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