图解以太网帧格式

                # Test here for various broadcast/multicast/LLC packets
                my $eth_obj=NetPacket::Ethernet->decode($pkt);

                # AARP (Appletalk Address Resolution Protocol)
                if ($eth_obj->{dest_mac}=~m/^090007ffffff/)
                    {
                        $main::proto = "aarp";
                    }

                # CDP (Cisco Discovery Protocol)
                elsif ($eth_obj->{dest_mac}=~m/^01000ccccccc/)
                    {
                        $main::proto = "cdp/vtp";
                    }

                # CGMP (Cisco Group Management Protocol)
                elsif ($eth_obj->{dest_mac}=~m/^01000cdddddd/)
                    {
                        $main::proto = "cgmp";
                    }

                # DEC MOP (DEC Maintenance Operation Protocol (MOP) Remote Console)
                elsif ($eth_obj->{dest_mac}=~m/^ab0000020000/)
                    {

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TAG标签:	格式 图解 my ip_obj- eth_obj- main::proto ip- tcp-