I have been having problems with all of my interfaces, and I have a feeling it is due to a recent upgrade to dhclient3 (apt-get install cups did it for met)

question 1: I would like to downgrade to a more stable version of dhclient, but I can't find any mention of how to do this.

question 2: could dhclient be causing my problems? Details:

I have heaps of problems connecting to networks (just random fails by dhclient to get a lease.) When I do finally get a lease, I will have tons of dropped packets and lag (I'll ping google.com or 192.168.1.254 and get all packets through fine for 50 requests once, control c, then run it again and have 93% packet loss. Sometimes the dns lookup times out.)

output of dhcdbd:
next timeout 1.000000
[contiues once a second forever]

output of dhclient --version: isc-dhclient-v3.1.1

I am running Debian 2.5.26-17, uname -r: 2.6.26-2-686

executed contents of /etc/network/interfaces:
auto lo
iface lo inet loopback
allow-hotplug eth0
iface eth0 inet dhcp

sudo pump -i eth1 will