Looking into IO::Socket at http://search.cpan.org/src/GBARR/IO-1.2301/IO/Socket.pm reveals:

sub send {
    @_ >= 2 && @_ <= 4 or croak 'usage: $sock->send(BUF, [FLAGS, [TO]]
+)';
    my $sock  = $_[0];
    my $flags = $_[2] || 0;
    my $peer  = $_[3] || $sock->peername;

    croak 'send: Cannot determine peer address'
     unless($peer);
[download]

So you have to take care that either peername is initialized on object creation, or provided the peer address as a third argument to send().

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