hi,all I have some question about the bpf. 1, $bpf open readonly fxp0 Does this mean that bpf read data from the interface "fxp0", but what kind of interface is "fxp0"? 2, $bpf filter "icmp and dst $myaddr" What does it mean? Is filter a function? thanks _____________________________________________ [�㲻���� ��������] ����ר�úţ�95963���û���/���룺263 �������ϣ��ͻ����� http://shopping.263.net/category19.htm