dhclient changes: ifconfig_sisXX="... DHCP" almost works right with natd

With the new dhclient arrangement, it looks like we almost support the 
following syntax:

ifconfig_sis0="ether 00:XX:XX:XX:XX:XX DHCP"

In that the boot sequence appears to automatically try DHCP after doing 
the ifconfig line.  This is great.  However, it looks like the detection 
of interfaces to use "-dynamic" with in /etc/rc.d/natd no longer works. 
Specifically, when I use the above syntax in rc.conf and run sh 
/etc/rc.d/natd start, I get the following:

  natdnatd: sis0: cannot get interface address

If I manually launch natd with -dynamic, then it does work properly again. 
If I remove the extended ether segment of the ifconfig line, it works 
again also. So it looks like 'list_net_interfaced dhcp' isn't matching the 
sis0 interface in the above example?

Robert N M Watson