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From: jb <jb.1234abcd@gmail.com>
Subject: Re: dhclient and random disconnects
Date: Thu, 13 Dec 2012 22:39:47 +0000 (UTC)
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David Demelier <demelier.david <at> gmail.com> writes:

> ... 
> I have setup lagg0 for a failover with ethernet, (note the problem 
> appears if I use wlan0 only too)
> 
> # Fail over between wired/wireless.
> cloned_interfaces="lagg0"
> ifconfig_msk0="up"
> ifconfig_ath0="ether 18:a9:05:87:38:0a"
> ifconfig_wlan0="WPA"
> ifconfig_lagg0="laggproto failover laggport msk0 laggport wlan0 DHCP"
> ipv6_activate_all_interfaces="YES"

According to the example in:
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/network-aggregation.html

this line is missing in your setup:
wlans_ath0="wlan0" 

which is also mentioned in:
/etc/defaults/rc.conf
...
#wlans_ath0="wlan0" # wlan(4) interfaces for ath0 device
...

I can not test it as I do not have access to a FB machine right now.
jb