User's Manual

EnRoute500 User’s Guide
TR0149 Rev. C5
59
9.2 Access Point Client Device Address Space
The enabled wlanN interfaces are assigned segments of the class C address space that each
node has to share between its client interfaces, which include eth0, wlan1, wlan2, wlan3, and
wlan4. The start address of the address segment and its size can be set with the
‘ip.size.requested’ and ‘ip.start.requested’ variables. The following restrictions are placed on
the address segment configuration:
• Each active interface must be assigned an address segment.
• The address segment start address, ‘ip.start.requested’, must be one of the following
values: 1, 33, 65, 97, 129, 161, 193, 225.
• The address segment size, ‘ip.size.requested’, must be one of the following values: 31, 63,
127, 255.
• The address segment size and start address must be chosen such that the address
segment does not cross a netmask boundary. See Table 8 in section 8.1.4 for a list of
allowed combinations.
• The address spaces for enabled interfaces must start at different addresses.
• The address spaces for enabled interfaces should not overlap.
In the example below, the WLAN interfaces are set up to use the lower half of the class C
address space. This assumes that the Ethernet interface is either used for gateway purposes
or is assigned to an address segment in the upper half of the class C network.
> use wlan1
wlan1> set ip.start.requested=1
wlan1> set ip.size.requested=31
wlan1> use wlan2
wlan2> set ip.start.requested=33
wlan2> set ip.size.requested=31
wlan2> use wlan3
wlan3> set ip.start.requested=65
wlan3> set ip.size.requested=31
wlan3> use wlan4
wlan4> set ip.start.requested=97
wlan4> set ip.size.requested=31
Each of the enabled interfaces’ address segments should be configured to avoid overlap with
the other interfaces’ address segments. In the case where a node is configured such that this
requirement is not met, address spaces will be automatically reduced in size to prevent
overlap. The actual start address and size of a segment are accessible via the ‘ip.start.actual’
and ‘ip.size.actual’ parameters.
The wlanN ‘ip.start.requested’ and ‘ip.size.requested’ values can be set via the web interface
using the “DHCP” sub-tab on the “DHCP” tab on the “System Parameters” page (see Figure
33).