Clinton Foster wrote:
> JDK 1.4 added three new methods on InetAddress to make this
determination.
> Have a look at this code snippet:
>
> InetAddress remoteInetAddress = controlSocket.getInetAddress();
>
> if (remoteInetAddress.isLinkLocalAddress() ||
> remoteInetAddress.isSiteLocalAddress() ||
> remoteInetAddress.isLoopbackAddress()) {
> // client is local
> }
>
> The one thing I'm unsure about is whether it is correct to check both
> isLinkLocal and isSiteLocal. The Javadoc is not very helpful. If
anyone can
> provide some additional insight, that would be great.
>
> I have tested this with various different FTP clients connecting from
inside
> and outside the firewall, both SSL and non-SSL, and it works in all the
> scenarios I've tried.
After reading the JavaDocs, I'm not entirely sure this will catch the
case where the server is on a private network (192.168.*.*), e.g. behind
a NAT? Link local seems to cover only 169.254.*.* addresses.
/niklas
