ipv4b.dstAddr(packet.get(IpV4Packet.class).getHeader().getSrcAddr());
eb.srcAddr(packet.get(EthernetPacket.class).getHeader().getDstAddr());
eb.dstAddr(packet.get(EthernetPacket.class).getHeader().getSrcAddr());
try {
handle4send.sendPacket(eb.build());
} catch (PcapNativeException e) {
e.printStackTrace();
} catch (NotOpenException e) {
e.printStackTrace();
}