public void execute() throws NoSuchProtocolException, NetworkException {
ARPNetworkLayer arp =
(ARPNetworkLayer) NetUtils.getNLM().getNetworkLayer(EthernetConstants.ETH_P_ARP);
PrintWriter out = getOutput().getPrintWriter();
if (argClear.isSet()) {
arp.getCache().clear();
out.println(str_cleared);
} else {
for (ARPCacheEntry entry : arp.getCache().entries()) {
out.println(entry);
}
}
}
private void updateARPCache(HardwareAddress hwAddr, ProtocolAddress pAddr) {
if (arp == null) {
try {
arp = (ARPNetworkLayer) NetUtils.getNLM().getNetworkLayer(EthernetConstants.ETH_P_ARP);
} catch (NoSuchProtocolException ex) {
log.error("Cannot find ARP layer", ex);
} catch (NetworkException ex) {
log.error("Cannot network layer manager", ex);
}
}
if (arp != null) {
arp.getCache().set(hwAddr, pAddr, true);
}
}