Getting IP address of client

Question

I am developing a web application using JSP  Servlets  Container  Glassfish  in which I need to get clients IP Address   I am getting the clients IP address  because I want to give access to some pages  like Customer maintenance forms  only on computers withing the office  I want to restrict access to those pages outside office   Following is my code so far   way1  String ipAddress    request getRemoteAddr    System out println  IP Address    ipAddress     way2  String ipAddress null  String getWay   request getHeader  VIA         Gateway ipAddress   request getHeader  X-FORWARDED-FOR         proxy if ipAddress  null        ipAddress   request getRemoteAddr      System out println  IP Address    ipAddress     Above code gives me different IP Address each time when I restart my computer  Shutdown- Start or Restart    I am getting IP6 like   fe80 0 0 0 20ca 1776 f5ff ff15 13   Let me know what is wrong with this code

User · Answer

I believe it is more to do with how your network is configured. Servlet is simply giving you the address it is finding.

I can suggest two workarounds. First try using IPV4. See this SO Answer

Also, try using the request.getRemoteHost() method to get the names of the machines. Surely the names are independent of whatever IP they are mapped to.

I still think you should discuss this with your infrastructure guys.

User · Answer

As  martin and this answer explained  it is complicated  There is no bullet-proof way of getting the client s ip address   The best that you can do is to try to parse  X-Forwarded-For  and rely on request getRemoteAddr     public static String getClientIpAddress HttpServletRequest request        String xForwardedForHeader   request getHeader  X-Forwarded-For        if  xForwardedForHeader    null            return request getRemoteAddr          else              As of https   en wikipedia org wiki X-Forwarded-For            The general format of the field is  X-Forwarded-For  client  proxy1  proxy2                we only want the client         return new StringTokenizer xForwardedForHeader       nextToken   trim

User · Answer

I use the following static helper method to retrieve the IP of a client   public static String getClientIpAddr HttpServletRequest request          String ip   request getHeader  X-Forwarded-For          if  ip    null    ip length      0    ip equalsIgnoreCase  unknown                ip   request getHeader  Proxy-Client-IP                  if  ip    null    ip length      0    ip equalsIgnoreCase  unknown                ip   request getHeader  WL-Proxy-Client-IP                  if  ip    null    ip length      0    ip equalsIgnoreCase  unknown                ip   request getHeader  HTTP X FORWARDED FOR                  if  ip    null    ip length      0    ip equalsIgnoreCase  unknown                ip   request getHeader  HTTP X FORWARDED                  if  ip    null    ip length      0    ip equalsIgnoreCase  unknown                ip   request getHeader  HTTP X CLUSTER CLIENT IP                  if  ip    null    ip length      0    ip equalsIgnoreCase  unknown                ip   request getHeader  HTTP CLIENT IP                  if  ip    null    ip length      0    ip equalsIgnoreCase  unknown                ip   request getHeader  HTTP FORWARDED FOR                  if  ip    null    ip length      0    ip equalsIgnoreCase  unknown                ip   request getHeader  HTTP FORWARDED                  if  ip    null    ip length      0    ip equalsIgnoreCase  unknown                ip   request getHeader  HTTP VIA                  if  ip    null    ip length      0    ip equalsIgnoreCase  unknown                ip   request getHeader  REMOTE ADDR                  if  ip    null    ip length      0    ip equalsIgnoreCase  unknown                ip   request getRemoteAddr                  return ip

User · Answer

As basZero mentioned  X-Forwarded-For should be checked for comma   Look at   http   en wikipedia org wiki X-Forwarded-For   The general format of the field is  X-Forwarded-For  clientIP  proxy1  proxy2    and so on  So we will be seeing something like this   X-FORWARDED-FOR  129 77 168 62  129 77 63 62

User · Answer

I do like this you can have a try  public String getIpAddr HttpServletRequest request             String ip   request getHeader  x-forwarded-for             if ip    null    ip length      0     unknown  equalsIgnoreCase ip                  ip   request getHeader  Proxy-Client-IP                        if ip    null    ip length      0     unknown  equalsIgnoreCase ip                  ip   request getHeader  WL-Proxy-Client-IP                        if ip    null    ip length      0     unknown  equalsIgnoreCase ip                  ip   request getRemoteAddr                        return ip

[java] Getting IP address of client

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