Insert server address

Nick,

yes this is possible, it is called redirect. On the box servicing the old address (the one to which helloworld.com resolves) create a rule like this:

rule redirect_helloworld {
    redirect to "http://10.2.2.2/%u"
}
virtual 10.1.1.1:80 {
     use rule redirect_helloworld
}

You should upgrade to a supported version of BIG-IP. Software support for BIG-IP 4.2 ended last year.