Thanks for your reaction, Cry Havok. I've searched, found and read your earlier comment, but it doesn't speak about the 8139D. I've sold some systems that are suited for using pfsense, untill now only with Intel NIC's. Realtek isn't perfect for me either. But the most basic idea of network adapters is: do they work without errors? The Realtek 8139D NIC's I'm testing are working without errors. The price difference between Intel one 1000GT and a one Realtek NIC is approximately $24/€19 (In the Netherlands). For a lot of people that makes the difference between a pfsense-based firewall and, lets say, a cheap Linksys router with embedded firewall. But I agree that for maximum performance the only solution is an adapter with Intel chipset.