On 01.11.2018 12:35, Madhur Khurana wrote:
Hi,
I am using tomcat8 and would like to configure ip address with subnet in
RemoteAddrValve for IP whitelisting (Example: 0.0.0.0/0). Can anyone help in
how to configure subnet in allow field.
The page at http://tomcat.apache.org/tomcat-8.5-doc/config/valve.html#Remote_Address_Valve
looks pretty easy to understand.
Example 1 provides the syntax you are looking for.
By combining "allow" and "deny" attributes with the appropriate regular expressions, you
can allow or deny access (aka whitelist or blacklist) from any range of client IP addresses.
Without a precise indication of which IP addresses/subnets you want to "whitelist", there
is not much else anyone here can tell you.
Is it (a) the "regular expression" part that you are having problems with, or (b) the IP
address format, or (c) the definition of a "subnet", or .. ?
For (a), see for example :
http://www.vogella.com/tutorials/JavaRegularExpressions/article.html
For (b) and (c), start perhaps here : https://en.wikipedia.org/wiki/Subnetwork
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