I can't see anything obviously wrong with your code, but one suggestion I would make is to grab a hold of Data::Dumper::Simple and add 
print Dumper(%addrule_nat);

[download]

..just before you call the append_entry() method. This should help to confirm whether or not all values are present in the hash.

One other comment - you must really trust your users if you're allowing them to modify the firewall via a web-interface ;)

Cheers,
Darren :)

In reply to Re: IPTables::IPv4 and parameters from CGI.pm by McDarren
in thread IPTables::IPv4 and parameters from CGI.pm by nermd

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