Unable to open rtnetlink socket ....

Hi all .... trying to install the BIRD on my RedHat 6.2 (2.2.18) from RPM and later by "make ...." Everything looks fine , but I still can't run the daemon. Allways with the same error: [root@fw /etc]# /etc/rc.d/init.d/bird start Starting BIRD: 11-09-2001 13:58:11 <FATAL> Unable to open rtnetlink socket: Address family not supported by protocol What's wrong? Can you help me please? Thank you very much Ross