IP passthrough?

[J A]

My application logs the IP addresses of visitors, and bans users who try to
abuse the system.  However, after using Perlbal, all requests end up going
through the Perlbal server, and so on the web server end, there's only one
source IP, the Perlbal server's.

Is there a way to fix this problem so that my application can still ban IPs
as needed? Maybe a HTTP_X_FORWARDED_FOR header?
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