Cisco Cisco 2106 Wireless LAN Controller

When clients use the controller’s internal DHCP server, IP addresses are not preserved across reboots. 
As a result, multiple clients can be assigned the same IP address. To resolve any IP address conflicts, 
clients must release their existing IP address and request a new one.

The controller supports web authentication redirects only to HTTP (HTTP over TCP) servers. It does not 
support web authentication redirects to HTTPS (HTTP over SSL) servers.

Cisco 1250 series access points are not supported for use with the Cisco 7920 IP phone. They can, 
however, be used with the Cisco 7921 and 7925 IP phones.

The controller disables the radio bands that are not permitted by the configured country of operation 
(CSCsi48220).

Cisco recommends that you do not configure 40-MHz channels in the 2.4-GHz radio band because 
severe co-channel interference is likely to occur.

In controller software release 4.2 or later, external antenna gain is factored into the maximum transmit 
power of the access point. Therefore, when you upgrade from an earlier software release to 4.2 or later, 
you might see a decrease in transmit power output.

These regulatory changes apply to the following countries for controller software 4.2.61.0 and later:

Argentina—802.11a support is removed

Brazil—802.11a support is removed

Canada—802.11a -N support is removed

Philippines—802.11a -N support is removed

Turkey—For 802.11a, -R is replaced by -I