Title pretty much tells everything. Is it possible to get current bandwidth usage in windows2003 via a perl script (using strawberry perl) ?
I rarely use Windows, and don't currently have access to a Windows machine, but you should be able to use WMI/WQL to get what you need.
This distribution provides a DBI interface to WMI:
https://metacpan.org/release/DBD-WMI
The correct query would be along the lines of
Select Name, currentbandwidth
FROM Win32_PerfFormattedData_Tcpip_NetworkInterface