IP input and output

[hubert at htop.pl]

Welcome. My varnish listen on many IPs. For example 127.0.0.1 127.0.0.2 and 127.0.0.3 on port 80. How to configure to relay/forward request to backend in this format:
 INPUT IP TO VARNISH | IP OF BACKEND
 127.0.0.1                         127.0.0.1
 127.0.0.2                         127.0.0.2
 127.0.0.3                         127.0.0.3
 Of course, the backend listens on other ports.

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 Thank you.
 Hubert Nodzak-Pluta
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