Packet Design, a Palo Alto maker of networking appliances originally spun out of Packet Design LLC, has raised $7.5 million in Series C funding, according to VentureWire (sub required):

The new round, which closed Sept. 20, came entirely from existing investors including Mayfield Fund, Advanced Technology Ventures, Allegis Capital, Masthead Venture Partners and Packet Design LLC, according to Packet Design Chief Executive Officer Jack Bradley.