Not directly related to your question, but this makes life easier:
if you have an Apache webserver, you can setup a CPAN cache that all nodes can use:

<IfModule mod_proxy.c>
    ProxyRequests Off
    ProxyPass        /cpan/cpan.pair.com http://cpan.pair.com
    ProxyPassReverse /cpan/cpan.pair.com http://cpan.pair.com
    <Directory proxy:*>
        Order deny,allow
        Allow from all
    </Directory>
    CacheRoot "/var/cache/apache"
    CacheSize          1000000
    CacheGcInterval    4
    CacheMaxExpire     10
    CacheLastModifiedFactor 0.1
    CacheDefaultExpire 1
</IfModule>
[download]

Plase change cpan.pair.com to the mirror nearest you.