read value of host-ip in perl-module (freeRADIUS 2.2.0)

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How (if at all) can I access the value of "host" (10.1.4.82 in the example above) from within the perl-module?

Phil Mayers p.mayers at imperial.ac.uk wrote:

There is a "virtual" attribute Client-IP-Address, that you can copy to a temporary attribute before calling the perl module e.g.

authorize { ... update request { Tmp-IP-Address-0 := "%{Client-IP-Address}" } myperl ... }

Many thanks to Alan and especially Phil for the detailed explanation. Best, Wolfgang