Assuming that you loose link or disassociate between AP's your DHCP client
should see this and try to renew it's lease.  Should be the same as
unplugging the cable and plugging it back in on a wired NIC.  I'm not sure
how dhclient does this in FBSD but I know in windows this should work. 
However unless you are using a tunnel or some VPN software any telnet or
streamed sessions will time out.

On Thu, Jul 18, 2002 at 08:13:40PM -0500, paul @ Klode on TV wrote:
>  If you connect to Access Point #1 which has DHCP running, it will assign
> you an address and gateway. (ie: 192.168.1.100 and gateway 192.168.1.1), now
> you drive down the street and hit Access Point #2.  If the gateway of that
> Access Point isn't 192.168.1.1 you won't get anywhere.
> 
> Is there any freeware/shareware out there that will try and renew a DHCP
> lease automatically upon loss of a network connection
> 
> 
> 
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