tcpdump problem

Hi list, I am running Suse 10 with the last kernel 2.6.13-15.7-default. I have a problem when running tpcdump i have the following error : # tcpdump -i eth0 tcpdump: socket: Address family not supported by protocol I have the same message with iptraf. In the file /var/log/messages i have found a messages like this : tcpdump uses obsolete (PF_INET,SOCK_PACKET) Can anyone help me. Thanks. Cristian Del Carlo