Can’t set Allow intra-BBS communication

[jbgood]

HELP! I’m trying to allow wireless devices on my network to communicate with each other.

Within Interfaces:Wireless, when I try to check the box for Allow intra-BBS communication, I get an error message:
This IPv4 address is being used by another interface or VIP

Wireless is bridged to LAN

Interface Assignments are:
LAN vr0
WAN vr1
Wireless ath0

LAN and Wireless IPv4 are both set to 192.168.1.1

WAN is connected to my ISP modem
LAN connected devices can browse to the web through WAN
Wireless devices can browse to the web
Wireless devices can connect to LAN devices
Wireless devices cannot see or connect to other wireless devices

My version is 2.1-RELEASE (i386)
FreeBSD 8.3-RELEASE-p11

[lsf]

You can not set the same ip on both interfaces.
If this is what you desire then create a bridge.
Sound like you hit a bug because you should not be able to create a interface that has the same ip. Change the IP to a different subnet or create a bridge between LAN and WIFI.
I recommend you use a different subnet and not a bridge. IntraBSS has nothing to do with IP conflicts so there seems to be a verification bug somewhere if you actually have 2 interfaces with the same IP already set.