UDP errors

 What must be the reason for high number of UDP "dropped due to no socket" and "broadcast/multicast datagrams dropped due to no socket" and "socket buffer overflows" in 10gRAC on AIX 6.1 platform? We adjusted udp_recspace and udp_sendspace parameters as suggested by tech support but still we see high numbers for these UDP stats.

oracle@node1:/opt/oracle INT$ netstat -s -p udp
udp:
        83346536 datagrams received
        0 incomplete headers
        0 bad data length fields
        0 bad checksums
        57685 dropped due to no socket
        56655 broadcast/multicast datagrams dropped due to no socket
        1384 socket buffer overflows
        83230812 delivered
        70753690 datagrams output
 
oracle@node2:/opt/oracle INT$ no -a | grep udp