ISC dhclient deconfigures all interfaces in configuration when ifdown is called

[Martin Kraus <lists_mk@wujiman.net>]

Hi. I'm using ISC dhcp client from testing and I have an interface
configuration in dhclient.conf that sends special dhcp options on a matching
interface. 
The problem is that if I have two interfaces configured using dhcp when one of
them gets deconfigured using ifdown <ifce> all of them get deconfigured.

Is there a way to avoid this? This seems weird. I'd think that ifdown would
kill only the coresponding dhclient but all of them die. It might be some
other problem but I haven't figured out what it could be.

thanks for help
martin