Gets the DDP connections true IP address by analyzing HTTP forwarded count from the Meteor.connection object. Stripped from iDM Connection Log.

meteor-get-real-ip

Meteor.methods({
 
    // Get the connections *real* IP
    getConnectionIP: function () {
 
        // No need to make others wait
        this.unblock();
         
        // Locals
        var conn        = this.connection;
        var ipPublic    = conn.clientAddress;
        var ipSource    = conn.httpHeaders['x-forwarded-for'].split(',')[0]
                        || ipPublic;
        var prox        = (process.env.HTTP_FORWARDED_COUNT)
                        ? parseInt(process.env.HTTP_FORWARDED_COUNT)
                        : 0;
        // Determine IP to log
        return (prox) ? ipSource : ipPublic;
         
    },
 
});
 
UI.registerHelper('currentIp', function () {
    return getConnectionIP();
}); 

nice work