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Restrict access to IPs in Tomcat

Add following valve to tomcat server.xml to restrict access to the website from limited IPs.

<Valve className="org.apache.catalina.valves.RemoteAddrValve" allow="127.0.0.1,xx.xxx.xxx.xx,xxx.xx.xxx.[6789].,xxx.xx.xx.xx.*,xxx.xx.xx.x[2345].,
xxx.xx.xx.xx[4578]"/>
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