private void initAccessOfHosts() {
		String[] hostsList = etcHosts.split(",");
		for (String hosts : hostsList) {
			String[] addresses = hosts.split(":");
			if (addresses.length > 1) {
				allowedHost.add(addresses[0]);
				allowedHost.add(addresses[addresses.length - 1]);
			} else {
				allowedHost.add(hosts);
			}
		}

		// add controller host
		allowedHost.add(consoleIP);
		try {
			java.security.Security.setProperty("networkaddress.cache.ttl", "0");
		} catch (Exception e) {
			// Fall through
		}
	}
Get ip address of target hosts. <br>
if target hosts 'a.com:1.1.1.1' add 'a.com' & '1.1.1.1' <br>
if target hosts ':1.1.1.1' add : '1.1.1.1' <br>
if target hosts '1.1.1.1' add : '1.1.1.1' <br>
<br>
Add controller host<br>
ngrinder-runtime/src/main/java/org/ngrinder/sm/NGrinderSecurityManager.java