802.11b ad hoc configuration

[Jim King]

I have a laptop and a desktop, each with a Cisco Aironet 350 802.11b wireless NIC.  I'm trying to get them talking to each other in ad hoc mode.  The laptop runs Win2000 and the desktop dual boots Win2000 and FreeBSD 4.3-stable.  With both boxes running Win2000 things work fine.  When I boot the desktop in FreeBSD I use ifconfig to assign an IP address to the wireless NIC, and use ancontrol to set ad hoc mode, turn off WEP, set the SSID, set the node name, set authorization type to none, and set the radio channel.  ancontrol's status/config displays show that these are being set, and the settings match the laptop, and after updating to 4.3-stable I'm not seeing any an(4) error messages on the console.  The status displays on both boxes are showing "beacons received" and "beacons transmitted" counters increasing, so I guess they're hearing each other at the radio level.  However, nothing gets through at the network level - no ping, etc.  Is there some other knob I need to tweak to get these two to talk to each other?   Jim