protected boolean ipPatternCanBeChecked(final String remoteIp) {
        return this.ipsToCheckPattern != null && StringUtils.isNotBlank(remoteIp);
    }
Base class definition for whether the IP should be checked or not; overridable.

@param remoteIp the remote ip
@return whether or not the IP can / should be matched against the pattern
support/cas-server-support-spnego-webflow/src/main/java/org/apereo/cas/web/flow/client/BaseSpnegoKnownClientSystemsFilterAction.java