How to get Client IP through dispatcher in CQ

Try following code to get client IP address.

	public enum IPHeaders {
	CLIENT_IP_UNDERSCORE("Client_IP"),
	CLIENT_IP("Client-IP"),
	X_CLIENT_IP("X-Client-IP"),
	X_FORWARDED_FOR("X-Forwarded-For"),
	FORWARDED_FOR("Forwarded-For"),
	VIA("Via"),
	REMOTE_ADDR("Remote-Addr"),
	X_REMOTE_ADDR("X-Remote-Addr"),
	X_CLUSTER_CLIENT_IP("X-Cluster-Client-IP"),
	X_FORWARDED("X-Forwarded"),
	FORWARDED("Forwarded");
	public final String text;
	private IPHeaders(String text)
	{
	this.text = text;
	}
	public String getText()
	{
	return text;
	}
	};
	//And Then
	public String getClientIpAddr(SlingHttpServletRequest request) {
	String ip = "";
	// looks through http headers, case-insensitive
	for (IPHeaders ipHeader : IPHeaders.values()) {
	ip = StringEscapeUtils.escapeHtml4(request.getHeader(ipHeader.getText()));
	if (ip != null) {
	LOGGER.debug(ipHeader.getText() + "=" + ip);
	}
	if (ip != null && ip.length()>0 && !"unknown".equalsIgnoreCase(ip)) {
	return ip;
	}
	}
	// note that if headers aren't set, we could return source of immediate upstream request
	// using request.getRemoteAddr(), but this isn't meaningful for us
	String remoteAddr = request.getRemoteAddr();
	if (remoteAddr != null) {
	LOGGER.debug("getRemoteAddr=" + remoteAddr);
	ip = remoteAddr;
	}
	if (ip == null || ip.length()==0 || "unknown".equalsIgnoreCase(ip)) {
	ip = "0.0.0.0"; // send a dummy value
	}
	return ip;
	}

view raw GetClientAdress.java hosted with ❤ by GitHub

// headers in order of trust, most trusted at top

Then in your JSP you can just do

<%=getClientIpAddr(slingRequest)%>

Note: Make sure that all headers are allowed from dispatcher

At dispatcher side make sure that you are allowing all the headers with this configuration in dispatcher.any

/clientheaders
      {
      "*"
      }