iRule redirect based on client IP address

Please try this:

when HTTP_REQUEST {
    if { ( [IP::addr [IP::client_addr] equals 10.1.1.1] ) or ( [IP::addr [IP::client_addr] equals 10.1.1.2] ) } {
        HTTP::redirect "http://10.200.200.200"
    }
}

You could also source the IP information from an address-based data group and make your iRule much simpler:

when HTTP_REQUEST {
    if { [class match [IP::client_addr] equals my_ip_dg] } {
        HTTP::redirect "http://10.200.200.200"
    }
}

where "my_ip_dg" is an address-based data group that can hold various IPs and IP subnets.