Net::INET6Glue might help. It works for FTP, SMTP, and LWP. For example, your script would start: 
#!/usr/bin/perl

use Net::INET6Glue;
require RPC::XML;
require RPC::XML::Client;

[download]
It works by replacing IO::Socket::INET with IO::Socket::INET6, aka "hot-patching". Make sure that you have IO::Socket::INET6 installed.

In reply to Re: IPv6 support for XML-RPC modules by Khen1950fx
in thread IPv6 support for XML-RPC modules by daphnaw

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