I tried to setup L2TP VPN on ubuntu 10.10 using xl2tpd, I installed xl2tpd from repository first: apt-get install xl2tpd, which gave me the version 1.2.6.
I set ip range but when I tried to connect to the VPN server, the remote ip was always 0.0.0.0 (I checkeded the /etc/log/syslog). After searching for a while, I found it’s actually a bug in xl2tpd. This bug is fixed in later version.