Does all data flow through haproxy or will it redirect?

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http://serverfault.com – If I am using haproxy as my only publicly accessible server that's job is to route requests to our backend servers, will all data flow through the haproxy server? If we have 50 servers and a single haproxy server, and the actual 1 gigabyte port on our front end haproxy server will not suffice. If this is the case (which I believe it to be), what options do we have? I believe I read something about dynamic dns, is that a potential solution? So clients still reach us at a single i.p address (mapping to our domain name), but once it hits our local network, dynamic dns will round robin (or som (HowTos)